m «< t « » ^ , DESCEIPTIVE AND ANALYTICAL BOTANY. UiMPOS : rmnril »T .Miin AM. oi.. >CA— mi i:r A.tU l-AIIMAMkNT kTIUIET A GENERAL SYSTEM or BOTANY DESCRIPTIVE AND ANALYTICAL. IN TWO PARTS. PART I.— OUTLINES OF ORGANOGRAPHY, ANATOMY, AND PHYSIOLOGY. PART II.— DESCRIPTIONS AND ILLUSTRATIONS OF THE ORDERS. ,-. BY EMM? LE MAOUT, DOCTOR OF MEDICINE ; MEMBKU OF THE SOCIET& PHILOMATHIQUE OP PARIS. CAISNE, MEMBER OF THE INSTITUTE OP FRANCE ; PROFESSOR OP CULTIVATION, JARDIN DBS PLANTES, PA11IS. WITH 5500 FIGURES BY L. STEINHEIL AND A. RIOCBEUX. TRANSLATED FROM THE ORIGINAL BY MRS. HOOKER. THE ORDERS ARRANGED AFTER THE METHOD FOLLOWED IN THE UNIVERSITIES AND SCHOOLS OF GREAT BRITAIN, ITS COLONIES, AMERICA, AND INDIA; WITH ADDITIONS, AN APPENDIX ON THE NATURAL METHOD, AND A SYNOPSIS OF THE ORDERS, BY J. D. HOOKER, C.B., F.E.S. L.S. & G.S., M.D., D.C.L. OXON., LL.D. CANTAB. DIRECTOR OF THE ROYAL BOTANICAL GARDENS, KEW ; CORRESPONDENT OF THE INSTITUTE OF FRANCE. SECOND THOUSAND. LONDON : LONGMANS, GREEN, AND CO. 1876. TO THE MEMORY OF THE JUSSIEUS, AND TO THE DISTINGUISHED EXPOUNDEK OF THEIR DOCTRINES, M. ADOLPHE BRONGNIART, MEMBER OF THE INSTITUTE OF FRANCE : PROFESSOR OF BOTANY AT THE JARDIN DBS PLANTES. EDITOE'S PEEFAGE. THIS English reproduction of LE MAOUT and DECAISNE'S work differs from the original published in Paris in 1868, first and mainly in the Natural Orders of Flowering Plants being arranged more nearly in the sequence followed in England and its dependencies, in the United States, and over the greater part of the Continent : — a course necessary to adapt it to the use of schools, universities, and the keepers of herbariums, botanical museums and gardens, in all English-speaking countries. This sequence, which is that originally proposed by De Candolle, and adopted with modifications by himself and by most classifiers, is further, in the opinion of the Editor, on the whole, the best linear arrangement hitherto devised. The sequence of the Orders followed in the original is that of the late accomplished Professor Adrien de Jussieu, son of Antoine- Laurent de Jussieu, the establisher of the Natural Orders of Plants upon the principles his uncle Bernard had devised. This sequence has been but partially adopted, even in Paris, where, although the lectures on the Natural Orders idven at the Jardin des Plantes are conducted in accordance with it, the D ' plants in the garden itself are arranged according to that of Professor Adolphe Brongniart (see p. 165). To render this part of the work complete, and to facilitate its use, I have added in an Appendix — what is a great desideratum in the original — a Conspectus of the Orders arranged under groups (cohorts), accord- ing to their affinities, in so far as this is practicable in a linear series. These groups are analogous to the * alliances ' devised by Lindley for his Vlll EDITOR'S PREFACE. ' Vegetable Kingdom,' though widely differing from them ; they more nearly approach the ' groups ' of Asa Gray's ' Introduction to Botany,' and are identical with the * cohorts 'of Mr. Bentham's and my ' Genera Plantarum ' in so far as these have been published, namely, to the end of Polypctalce. The remaining Dicotyledonous Orders are grouped approximately by Mr. Bentham and myself, and are subject to rectification as we advance with our analyses of the genera for that work ; for it must be borne in mind that no Natural Order or higher group can be accurately limited till all the genera belonging to itself and its allied groups have been thoroughly investigated, compared, and contrasted. For the grouping of the Monocotyledons I am alone responsible. The next considerable deviation from the original consists in the intro- duction of various omitted Orders, and of much additional matter under the others, especially the tribes, sub-tribes, etc., of the large Orders, and in the increased numbers of genera (the selection of which is necessarily to some extent arbitrary) which have been cited. This will render the English edition more useful to voyagers and travellers, and to dweHers in America, India and the Colonies, whose requirements in this respect have been especially regarded. The twenty-four Orders omitted in the original, and supplied here, are chiefly small ones ; but some, as xx., xxxiv., LVII., LXXIV., xcn., CLXVII., and ccxxi., are either of considerable extent, or of importance under other points of view. They are as follow : — CLXXXIX. HERNANDIE^E. CCIV. PENJJACE^E. CCV. GEISSOLOME^E. XX. CANELLACE^E. XXIV. VOCHYSIACEJS. XXXIV. DlPTEROCARPEJ-J. XXXV. ClILuENACE^E. LVII. BURSERACE^E. LIX. CHAILLETIACEJS. LXV. STACKHOUSIEJS. LXXII. SABIACE^E. LXXIV. CONNARACE.E. XCII. RllIZOPHOREJi. Oil. SAMYDACE.E. CX. FICOIDE^E. CLXVII. CRESCENTIE.-E. CCVI. LACISTEMACE^;. CCXV. GRUBBIACE^E. CCXXI. PoDOSTEMACEJi. MONOCOTYLEDONS. VII. APOSTASIACEJ3. XVI. TRIURIDE.E. XLII. ROXBURGHIACE^E. XLV. RAPATEE.E. XLIX. MAYACE^E. EDITOR'S PREFACE. ix The number of Orders adopted in this work greatly exceeds that which will be adopted by Mr. Bentham and myself in the ' Genera Plantarum,' or than is accepted by Professor Asa Gray, and most modern systematists: many of them are not in our opinion entitled to that rank, being rather to be regarded as tribes or aberrant genera of larger Orders. A multiplica- tion of these is, however, in a work of this description far from a great evil : it enables the student to form a clearer idea of the essential characters of the more important Orders, from which the lesser are departures ; and it affords the opportunity of illustrating more copiously many structural and physiological matters of high importance. It will be observed that the authors have been scrupulously careful in indicating the very slender pre- tensions that many of these lesser groups have to ordinal rank, and in pointing out their affinities. • \ In dealing with the Introduction to Botany, p. 1, the Translator has had much difficulty. In point of style, a literal translation of the original was inadmissible ; its copiousness of expression and repetitions of adjective terms, however suited to French, are obstacles to English students, who associate clearness with a concise, rather than with a more diffuse method of exposition. The Translator has therefore condensed the matter of this part of the work — it is to be hoped, without loss of sense or substance ; and the space gained has been devoted to those additions to the Systematic portion which are enumerated above. It will be obvious to the English reader, that it has not been the aim of the Authors to give an exhaustive history of the Natural Orders : what they have given is a clear and precise structural and morphological account of each, with a sketch of its affinities, geographical distribution, and principal uses in medicine and the arts ; and in this, I think, they have succeeded to a degree not attained in any previous work of the kind. On the extent and utility of the Illustrations there is no need to dwell ; but it is only my duty to one of the Authors to state (which does not appear in the original) that their great value is due to the use made of my friend M. Decaisne's unique collection of analytical drawings, the fruits of his life-long botanical labours, and which for scientific accuracy and artistic excellence have never been surpassed. x EDITOR'S PEEFACE. Nearly thirty years have elapsed since I first had the privilege of inspecting those portfolios, the contents of which have, with a rare liberality, been ever since placed at my disposal when desired. Few or no allusions are made under the Natural Orders to histological characters ; to the differentiation and development of the organs ; to the phenomena of fertilization ; to the functions of nutrition, circulation, and respiration ; nor to the structural characters of Fossil Types, which, in the case of a few Orders (chiefly Cycadece and Lycopodiacece), are of great signi- ficance in reference to these and their allies. To have introduced all these subjects to any useful purpose was beyond the scope of this work. A companion volume devoted to them — that is, one completing the Life-history of the Natural Orders — is the great desideratum of Botanical Science. It remains for the Editor and Translator to thank the Authors for their confidence, both in entrusting them with the task, and in liberally per- mitting the re -arrangement of the Orders according to the Editor's judgment of the requirements of those for whose use the English version is made. Jos. D. HOOKER. ROYAL GARDENS, KEW : December 1872. PBEFACE. THE FIRST PART of this work, together with the woodcuts illustrating the Natural Orders, is a reprint of the ' Atlas Ele*mentaire de la Botanique/ edited by one of the Authors some years ago, and which has been favourably re- ceived by the scientific public. This, however, being devoted to European Orders, and confined to brief systematic descriptions only of these, could not illustrate the affinities of all the known types of the Vegetable Kingdom. To supply this deficiency, We have here added nearly all the exotic Orders, with detailed descriptions of their affinities and uses ; so as to give such a general view of the Vegetable Kingdom as may be advantageously consulted by students and professed botanists. For the sequence of the Orders we have followed the classification of A. de Jussieu l in the valuable article on Taxonomy in the ' Dictionnaire Universel,' simply inverting the series, so as to commence with the most highly organized, and end with the Families of lowest organization, whose history is still obscure. The reader will observe that We have treated the Monocotyledons and Cryptogams with greater fulness than the Dicotyledons : this is because the two first, and especially the Cryptogams, having hitherto been much less fully studied than the Dicotyledons, required much more careful illustration. We have also thought it best to detach from the larger groups many monotypic Orders, so as to give them greater prominence ; following in this 1 In this English edition the Editor has, with bodies of Great Britain, as well as of working bo- the approval of the authors, adopted that inodifi- tanists, herbarium keepers, &c. A sketch of A. de cation of the elder Jussieu's system known as De Jussieu's sequence of the Families will be found in Candolle's, in order to suit the convenience of the the chapter devoted to Taxonomy (p. 167 ; see also Universities, Medical Schools, and other educational p. 988). 2 INTRODUCTORY CHAPTER. descend, and they together constitute the vegetable axis. In its early stage this axis is simple, but by successive growths it usually gives oft' branches, which form secondary axes ; each branch may thus be regarded as an independent axis. The point of junction of the stem and root is the neck (collum, c). It is from this point, which may be thickened, shortened, or obscure, that the ascending fibres of the s|ptn and the descending fibres of the root diverge. The stem, which alone possesses the power of emitting lateral expansions, develops from its sides more or less flattened bodies, the leaves (F). The point at which the leaves issue from the stern is generally thickened, and is termed a node (nodus); the intervals between the nodes are termed internodes (intern-odium, merithallus). When the nodes develop leaves only, the stein remains perfectly simple or unbranched ; but at each node a bud (gemma, B, B) may spring from the axil of the leaf; and this bud, which appears at first as a small protuberance, afterwards become? a branch (rannis), which lengthens, develops leaves, and ramifies in its turn. The buds springing from the axils of the leaves on the primitive axis thus give origin to as many fresh axes, whence it results that the mother- plant is repeated by every bud which it produces. Hence it is more logical to say that a plant multiplies, than that it diridcs by branching; and a vegetable may thus be looked upon, not as an individual, but as a collective being, or an aggregation of individuals nourished in common, like the zoophytes of a coral. The node does not always produce a leaf and bud; the bud may be absent or scarcely visible, or the leaf may be imperfectly developed : but the latter is rarely entirely suppressed ; and when the bud is undeveloped, it is owing to the rigour of the climate or the short duration of the plant. Leaves are not developed promiscuously on the stem ; they may be given off singly, when they are alternate (alterna, fig. 2) ; or two may be placed opposite to each other (opposita, fig. 8) ; or they may be whorled around the stem (vertlcillata, 2. Toad-flax. Alternate loaves. 3. St. Jolin-n Wort, leaves. 4. MiuUler. Wliorledleave*. fig. 4). Stem-leaves are rarely whorled, but floral leaves are arranged in several superimposed whorls (verticilli). Alternate leaves, though apparently scattered without order on the axis, are really arranged in a spiral (fig. 5) ; so that, in starting from any one leaf (1), we arrive, after one or more turns of the spiral, at another leaf (6), placed INTRODUCTORY CHAPTER. directly above the first ; whence it results that, if the leaves completing the spiral (1, 2, 3, 4, 5) were all placed on a level with the first, they would form a whorl around the stein. This arrangement is more easily traced on young branches of trees than on herbaceous steins. The fibro- vascular bundle connecting the green expansion of the leaf with the stem is the petiole (petiolus, fig. 6). It extends from the axis to the blade or limb L 5. Oak. Branch. Fed-- 7. Wallflower. Flower. (limbus, lamina), which is composed of parenchyma and fibro- vascular bundles, which latter form the nerves (nervi, 1, 2, 3). The middle nerve of the limb, which is continuous with the petiole, is the median nerve or midrib (n. medius, costa media}. The bundles which rise from each side of the midrib are the lateral nerves (n. late- rales) ; and these again give rise to secondary (2), tertiary (3), &c. nerves, according to their subdivision. A leaf springing directly from the stem without a petiole is sessile (f. sessile, figs. 2-4), and that with a petiole is petiolate (f. petiolatum, figs. 5, 6). The leaf- blade is protected on both surfaces by a thin, colourless, and transparent skin (epidermis), which covers almost the entire plant, and will be described later. The coloured leaves, arranged in whorls at the extremities of the ultimate branches of the axis, together form the flower (flos, fig. 7). The branch which immediately bears a flower, and forms the axis of its component whorls, is its peduncle or pedicel (pedunculus, pedicellus, fig. 7, Fed). Its more or less swollen extremity, upon which the whorls of the flower are grouped, is the receptacle (receptaculum, fig. 10, R). In the most fully developed plants the flower is usually composed of four successive whorls (fig. 7), of which the internodes are suppressed. The outer or lower whorl is the calyx (calyx, figs. 7, s, and 8), the leaves of which are sepals (sepala, fig. 8). The whorl within or above the calyx is the corolla (corolla, fig. 7, P), and its leaves are petals (petala, fig. 9). When a petal is not sessile, but has its blade (L) borne on a petiole (o), this petiole is called the claw (umjuis). n2 4 INTRODUCTORY CHAPTER. The whorl within or above the corolla is the androecium (andrcecium, figs. 7, E, and 10), and its leaves are stamens (stamina, figs. 10, E, and 11). The petiole of the stamen is the filam>nt (filamentum), and its blade is the anther (anthem). The dusty parenchyma contained in the anther is called pollen (pollen, p). This pollen leaves the anther at a certain period, and, falling on the centr.il organ of the flower, assists in the formation of the seed. There frequently occur on the receptacle (fig. 10, n) small bodies (GL) which secrete a sweet juice, named nectariferous glamh or nectaries (ylandnlce nectarifercr, nectaria). The whorl within or above the andrajciuin is the pistil (pistillnm, fig. 12). This, 0 3 8. Wallflower. r.ih \ (in. I--. i. S». Wallflower. PeUI. o R. 12. Columbine. Pistil eompooed of ft carpels, •with the scars nf the stamens on the receptacle R. 13. Coliiinblne. Ripe carpel puriially opened at the top. 14. Pea. Hit* pis-i! !•">. Aprirot. Pistil cut vertically (inn?.), showing the fwmpendpd ovule i>, v. mlfrmn .-, mid axis of style T, traversed by the jxillen to fertilize the ovule. the central or last of the floral whorls, is composed of one or more leaves called carpels (carpidia, carpella, fig. 13), bearing on their edges small bodies called ovules (ovula), destined to reproduce the plant when fertilized by the pollen. The blade of the carpel, which encloses and protects the ovules, is the ovary (ovarium,, fig. 12, o) ; its prolongation upwards into a longer or shorter neck is the style (stylus, T) ; and the stigma (stigma, s) is an organ of variable form, spongy and viscous when young, usually placed on the top of the style, and destined to receive the pollen, which adheres to its surface. The substance of an ordinary leaf, however thin, consists of three parts : (1) an upper and (2) an under surface, enclosing (3) a network of fibres and paren- chyma ; and a slight inspection will show that a carpellary leaf is constructed on the same plan. Thus in the Pea, the pistil of which is composed of a single carpi •!, which splits into halves when ripe (fig. 14), the outer portion of the leaf (E) is a thin skin, easily torn away, named epicarp (epicarpium). The inner portion (EN) INTRODUCTORY CHAPTER. consists of a thicker and paler membrane than the first, named endocarp (endocar- pium). The intermediate portion consists of a more or less succulent tissue (accord- ing- to the proportions of fibre and parenchyma), named mesocarp (mesocarpium). In the solitary carpel which forms the pistil of a Cherry (fig. 16), Peach, or Apricot (fig\ 15), the epicarp (F) is a thin skin, the mesocarp (figs. 16, ME, and 15, E) is very thick and succulent when ripe, and the very hard eudocarp (figs. 10, N, and 15, D) forms the stone. The fibro-vascular bundles (fig. 14, L) which are found on the edges of the blade of the carpellary leaf, and which both bear the ovules (o) and transmit nourishment to them, are called the placentae (placentae, trophospermia). Each placenta produces lateral branches or cords, called funicles (funiculi, F), which are sometimes very short, and through which the nourishing juices are conveyed to the seeds. When the funicles are absent (fig. 13), nourishment is transmitted directly to the seed from the placenta. The seed or plant-egg (semen, fig. 1 7) is the ovule fertilized by the pollen. It is composed, (1) of a very small body, destined to reproduce the plant, the embryo (or plantula] ; (2) of an envelope or integument surrounding and protecting the embryo. This integument (in the ovule) either originates from the top of the funicle (fig. 17, F), or directly from the placenta (fig. 13). It usually consists of two layers or coats, an external testa (fig. 17, i), and an internal endopleura (E). The point of union of the seed and funicle, and at which its nourishment enters, is called the hilum or umbilicus (fig. 18, H), and is a part of the testa. The chalaza (fig. 17, H) marks the spot where the juices penetrate the internal coat and reach the 16. Cherry. Eipe carpel, cut vertically, showing the seed suspended by a funicle c springing from the bottom of the kernel. 17. Pea. Seed deprived of half its integument (mag.). 18. Pea. Part of the in- tegument of the seed (mag.). 19. Pea. Embryo spread open (mag.). embryo, and is usually indicated on the outside by a projection or thickening or discoloration. When the hilum and chalaza are superimposed, the juices reach the embryo directly ; when they are at opposite ends, they are connected by a small cord, raphe (figs. 17, A, and 18, E), which runs between the two coats. The small opening through which the ovule is acted on by the pollen is the micropyle (figs. 17, and 18, M). The embryo (figs. 17, 19) is a complete plant in miniature, composed of a stein, caulicle (tigellus, cauliculus, T), a root, radicle (radicula, E), one or two leaves, coty- ledons (cotyledones, c), and a bud, plumule (gemmula, plumula, G), usually occupying a small pit (F) sunk in the thickness of the cotyledons. The young plant, after having been nourished by the juices transmitted through the funicle, detaches 6 INTRODUCTORY CHAPTER. itself from the latter with its integuments; and when placed under favourable circumstances, it sheds or leaves its coats, and becomes developed into a plant similar to its parent. The caulicle (T) is a small cylindric or conical body, bearing the first leaves of the plant (fig. 19, c), which ascends to form the stem. The radicle (R), or organ destined to develop the roots, is at first merely a transparent point terminating the free end of the caulicle, and tending downwards ; it usually corresponds in the seed to the position of the micropyle (figs. 17, 18). The cotyledons (figs. 17, and 19, c), which are the first leaves of the young plant, spring laterall}' from the caulicle, and protect the plumule, or first shoot of the future plant; they are usually thick and succulent, and nourish the young plant until it is able to support itself. Within the integuments of the seed there always exists, at an early period, a peculiar form of cellular tissue, the study of which is important, and to which we shall recur; it is sometimes rapidly absorbed by the embryo, but at others it is retained in the seed until germination, in which case it is called albumen, and supplies the young plant with its first food. Considering the embryo as the plant in its simplest form, let us follow the growth and lateral development of its primitive axis. The two first leaves (cotyledon*) are attached to the small stem (caulicle), as may be seen in the Pea (fig. 19), or, bettor, in a germinating Bean (fig. 20, c, c). The radicli', which terminates the free end of the caulicle (fig. 20, T), sends out many descending branches, and forms the root (u). Sometimes the coty- ledon is solitary, as in the Maize (fig. 21, c), when the rootlets usually spring from various points of the caulicle (t), and branch very little. At the point of union of the cotyledons or cotyledon with the cauliclc is the plumule (fig. 20, 0,0, and fig. 21, . Narrtesnu. Cont«l tmlb. /, etlolo. 56. Aciu-in lict<>ro])h>lUi8. Pbjllod*. The leaves and roots are the principal organs of nutrition, absorbing from the atmosphere gases and liquids suited for the nutrition of the vegetable : they also act as respirators, and as exh tilers of useless matters ; and it is in their tissues that the sap, absorbed by the root, and conducted upwards by the stem, parts with its surplus fluids, and acquires all its nutritious properties. Of all plant-organs, the leaves are those which present the greatest variety, and which supply most specific characters. When the vascular bundle which enters the leaf is prolonged for a certain length before branching to form the skeleton of the blade (limbus), it takes the name of petiole (petiohis), and the leaf is called petiolate (/. petiolatum, Cherry, fig. 6) ;— when it expands immediately after leaving the node, the leaf is reduced to its blade, and is called sessile (/.sessile, St. John's Wort). When the blade merely narrows so as to form an obscure petiole, it is called sub-petiolate (/. Knb-j,rtinlntiim). The petiole may be cylindric (p. cylindricus) ; longitudinally grooved or channelled THE LEAVES. 19 (p. canaliculatus) ; flattened horizontally, or depressed (p. depressus)', — flattened laterally or compressed (p. compressus) ; in this case it is usually flexible, and the pendulous blade trembles with every breath of wind (Aspen). The petiole is usually of tolerably uniform diameter throughout its length (p. continuus, Ivy, fig. 47) ; but it may be much dilated in the middle, and thus resemble a blade separated from the true blade by a constriction, when it is winged (p. alatus, Orange, fig. 55, P; Acacia heterophylla, fig. 56). Lastly, a dilated petiole 58. Wheat. Sheathing leaf. 69. Clematis. Twining petiole. may replace the true blade, when it is called a phyllode (phyllodium), as in most Australian Acacias. When the enlarged base of the petiole, and the node from which it issues, occupy a large portion of the circumference of the stem, the petiole is called amplexicaul (p. amplexicaulis, Ranunculus, fig. 57) ; if the entire petiole is enlarged, and sheathes the stem, the leaf is called sheathing (vaginans, Carex, Wheat, fig. 58). The direction of the petiole is usually straight, but in some plants it twines round neighbouring objects (Clematis, fig. 59). Stipules. — A leaf is stipulate (/. stipulatum), when provided at its base with appendages more or less analogous to leaves, named stipules (stipula?, Heartsease, fig. 60). These may be persistent (s. persistentes), when they persist as long as the leaf which they accompany (Heartsease, fig. 60) ; or caducous (s. caducce), when they fall before the leaf, or as soon as the shoot lengthens (Willow, Oak). c 2 20 ORGANOGRAPHY AND GLOSSOLOGY. CO. Heartsease. Leaf with lateral stipules. &». Melon. Leaf with palmate nerve*. 66. Couifrey. Decurrcut leaf. . IIoQeyiuckle. Connate leaves. C8. Buplcurum. Perfoliate leaf. THE LEAVES. 21 Stipules are foliaceous (s. foliacece), when of the colour and texture of leaves (Heartsease, fig. 60) ; — scale-like (s. squamiformes), when thin like scales ; — mem- branous (s. membranacece] , when thin, flexible, and almost transparent ; — scarious (s. scariosce], when dry and coriaceous (Beech, Willow, Hornbeam) ; — spinous (s. spinosce), when contracted and hardened into spines (Robinia, fig. 114) ; cirrhose (s. cirr~kiform.es), when they lengthen into twining tendrils (Melon, fig. 61). (We retain the name of stipules for the tendrils of the Melon and other Cucurbitacece, in deference to the glossology adopted by botanists ; but we shall return to this subject when discussing tendrils. Stipules are lateral (s. laterales], when inserted left and right of the leaf (Hearts- ease, fig. 60; Robinia, fig. 114); — axillary (s. axillares), when in the axil of the leaf; they are then usually consolidated into one. Such axillary stipules may cover only a part of the circumference of the stem (Drosera], or may completely surround it (Buckivheat, fig. 62), in which latter case.it bears the name of ochrea. The ligule of grasses (ligula, Meadoiv-grass, fig. 63) is simply an axillary stipule (Lig.), situated at the separation of the blade (L) from the sheathing petiole (G) ; it may be entire, emarginate, laciniate, pilose, &c. Of the whorled leaves of Madder (fig. 4) and other Rubiacece, the two opposite ones are alone considered as true leaves, and bear each a bud in its axil ; the others are regarded as stipules, sometimes multiplied, when there are more than four, or confluent, when fewer than four. The Nerves of the leaf are said to be parallel (n. paralleli), when they run free and parallel to the edge of the leaf and to each other (Iris, figs. 33, 79) ; — branching or anastomosing (n. ramosi, anastomosantes) , when they subdivide and join each other (Cherry, fig. 6). Branching nerves are pinnate (n.pinnati], and the leaves penni-nerved* (f. penni-nervia], when lateral nerves, like the plumes of a feather, spring from the midrib (Cherry, fig. 6) ; — palmate (n. pal- mati, palmatinervia), when several primary nerves diverge from the base of the blade like the fingers of a hand (Melon, fig. 64). The primary nerves only are palmate ; the secondary, tertiary, &c., are always pinnately arranged. As regards position, leaves are radical (f. radi-r calia], when they spring from near the neck, and hence appear to rise from the root (Dandelion, fig. 29 ; Plantain, Erophila, fig\ 65) ; — cauline (f. caulina], when they spring from the stem and branches (Rose, fig. 50). Leaves are clasping or amplexicaul (f. amplexicaulia], when the base of their petiole or blade surrounds the stem (Butter- cup, Henbane); — decurrent (f. decurrentia] , when their blade is continued down the stem, forming a sort of foliaceous wing ; « 69. Yew. Distichous leaves. 70. Fascicled leaves. 22 ORGANOGRAPHY AND GLOSSOLOGY. 71. Raniincnlus nqnatilil. Dissimilar leaves. 73. SedtiTii. Cylindrical learw. 72. ShcphcnVs pnrse. Dlseimilar loarc*. 7fl. Enstcr daisy. SpathulaU- leaf. Kp 79. Iris. Ensiform leaves. 74. Small malluw. Orbicular leaf. 78. Privi't. Lancuulau* leaf. 77. Chcnopodinm. AngTilnr leaf. .Titnipt r. slwin-U leaves. THE LEAVES. 23 the stem is then winged (caulis alatus, Comfrey, fig. 66) ; — confluent or connate (f. con- nata), when the bases of two opposite leaves join around the stem (Honeysuckle, fig. 67, Chlora) ; — when the base of a single leaf spreads completely round the stem, the stem and leaves, are perfoliate (c. f. perfoliatus, Bupleurum, fig. 68). Leaves are alternate (f. altei*na; Stock, fig. 1; Toad-flax, fig. 2 ; Oak, fig. 5) ; — opposite (f. opposita, St. John's Wort, fig. 3) ; — whorled (f. verticillata, Oleander, fig. 82 ; Madder, fig. 4) ; — distichous (/. disticha), when they spring from alternate nodes placed on two lines to right and left (Yew, fig. 69) ;— fascicled (f. fasciculata), when crowded into a bundle on very short branches (Weymouth Pine, fig. 70). In true Pines this bundle is persistent ; in larches the leaves become solitary and scattered, in consequence of the elongation of the axis. Imbricated leaves (/. imbricata) overlap like roof-tiles (Houseleek, Cypress, Thuja). Colour of Leaves. — Leaves are green when of the usual colour; — glaucous (f. glauca) when of a whitish dusty green or blue (Poppy, Cabbage) ; — spotted (f. maculata) when they have spots of a different colour from the ground (Arum) ; — • variegated (f. variegata) when they are of many colours arranged without order (variegated Holly, tricoloured Ama.ranth) ; — hoary (f. incana), when they owe their colour to short and close hairs (Ten-week-stock). Forms of Leaves. — Without being precisely alike, yet the leaves of any one plant are usually very similar ; but in some species they are obviously dissimilar (Paper Mulberry, Calthrop, Water Crowfoot, fig. 71 ; Shepherd's purse, fig. 72) ; the plant is then said to be heterophyllous (pi. heterophylla). Leaves are plane (f. plana), when their blade is much flattened, as is usually the case (Lime, fig. 86) ; — cylindric or terete (f. teretia), when the blade is rounded throughout its length (Sedum, fig. 73) ; — orbicular (f. orbiculata), when the circum- ference of the blade is more or less circular (small Mallow, fig. 74) ; — ovate (f. ovata), when the blade resembles the longitudinal section of an egg, with the larger end at the base (Pear, fig. 75) ; — obovate (f. obovata), when ovate, with the smaller end at the base (Meadow-sweet, St. John's Wort) ; — oblong (f. oblonga), when the width is about a third of the length (small Centaury) ; — elliptic (f. elliptica), when the two ends of the blade are rounded and equal, like an ellipse (St. John's Wort, fig. 3) ; — spathulate (/. spathulata), when the blade is narrow at the base, and large and rounded at the end, like a spatula (Easter Daisy, fig. 76) ; — angular (f. angulata), when the circumference of the leaf presents three or more angles; — deltoid (f. deltoidea), if it presents three nearly equal angles, like a delta, A (Chenopodium, fig. 77). Leaves are lanceolate (f. lanceolata), when the blade is largest in the middle, and diminishes insensibly towards the extremities (Privet, fig. 78) ; — linear (f. linearia), when the sides of the blade are nearly parallel, and the space between them narrow (Toad-flax, fig. 2) ; — ensiform (f. ensiformia), when of the shape of a sword ; in this case, the two surfaces are in apposition and consolidated in the upper part (Iris, fig. 79) ; — subulate (f. subulata), when the cylindrical blade terminates somewhat like an awl (Ledum reflexum) ; — needle-shaped (f. acerosa), when the blade is hard, narrow, and pointed like a needle (Pine, fig. 70, Juniper, fig. 80) ; — • 24 ORGANOGKAPHY AND GLOSSOLOGY. apillary (f. capillacea), when slender a,nd flexible like hairs (Water Crowfoot, fig. 71) ; — filiform (f. filiformia), when thin and slender like threads (Asparagus, fig-. 81). The false leaves of Asparagus here alluded to, and which have been described as leaves by most ' botanists, ought to be considered as* branches springing from the axils of small scarious scales, which are the true leuves. H'.'. Oleander. Acute leaves. *•">. Ainnrantli. KniarginaU* loaf. Leaves are acute (f. acutu) when they terminate in a sharp angle (Oleander, fig. 82) ; — acuminate (f. acumimita), when the tip narrows rapidly and lengthens into a point (Pelidonj, fig. 8:>) ;— Muse (f. oblus. time. Cordate leaf. 87. Ground ivy. Itenifnrin leaf. W». Bindweed. nt.' leaf. 80. Sheep's sorrel Hastate leaf. fig. 84); — emarginate (f. emarginatd), when it terminates in a shallow sinus (Amaranth, fig. 85). Leaves are cordate (/. cordata), when the base forms two rounded lobes and the tip is pointed, somewhat like an ace of hearts (Lime, fig. 86) ; — reniform (f. reniformia), when the base is cordate but the tip rounded, like a kidney (Ground />,/, fig- 87) ; — sagittate (f. sagittata), when the base is lengthened into two sharp lobes, which are oblique or parallel to the petiole, like an arrow (Bindweed, fig. 88) ; — THE LEAVES. 25 hastate (f. hastata), when the two lobes are nearly perpendicular to the petiole, like a halbert (Sheep's sorrel, fig. 89) ; — peltate (f. peltatum), when the petiole is joined to the centre of the under surface of the blade (Nasturtium, fig. 90), in which case the primary nerves diverge symmetri- cally from the petiole, like the spokes of a wheel. A peltate leaf may be compared with the orbicular palmately-nerved leaves of Mallows, for if the two 90. Nasturtium, Peltate leaves, 91. Curled Mallow. edges nearest the petiole of the leaf of the small Mallow (fig. 74) were joined, a peltate leaf would be the result. Surface of Leaves. — Leaves are smooth (f. Icevia), when their surface presents neither hairs nor inequalities (Orange);— scabrid (f.scabra), when rough or harsh to the touch (Carex); — glabrous (f. glabra), when, whether smooth or not, they have no hairs (Tulip] ; — silky (f.sericea), when clothed with long, even, shining hairs (Silver- tveed) ; — pubescent or downy (f. pubcscentia) , when they are clothed with soft short hairs (Strawberry} ; — pilose (f. pilosa), when the hairs are long and scattered (Herb- Robert] ; — villous (f. villosa), when the hairs are rather long, soft, white, and close (Forget-me-not) ; — hirsute (f. hirsuta), when the hairs are long and numerous (Rose-campion) ; — hispid (f. hispida), when they are erect and stiff (Borage] ; — setose (f. setosa), when they are long, spreading, and bristly (Poppy) ; — tomentose (f. tomsn- tosa), when they are rather short, soft, and matted (Quince) ; — woolly (f. lanata), when long, appressed, curly, but not matted (Corn- centaur y) ; — velvety (f. velutina, holosericea),when the pubescence is short and soft to the touch (Foxglove) ; — cobwebby (f. arachnoidea) , when the hairs are long, very fine, and interlaced like a cobweb ( Thistle, Cobwebby Houseleejc) . Leaves are wrinkled or rugose (f. rugosa), when their surface presents in^ equalities, due to there being more parenchyma than is enough to fill the spaces between the nerves (Sage) ; — bullate (f. bullata), when this excess of parenchyma renders the inequalities more visible, and, the whole blade is swollen between the nerves (Cabbage) ; — crisped (f. crispa), when the extra parenchyma only appears at the edge of the blade, which appears crimped (Curled Mallow, fig. 91) ; — waved (/. undulata), when for the same reason the edges are in rounded folds (Tulip). 26 ORGANOGRAPHY AND GLOSSOLOGY. Hairs and Spines on the Margins of Leaves. — The leaf is ciliate (f. ciliatum), when its margins bear long hairs like eyelashes (Sundew, fig. 92) ; — npinous (f. spinomm), when the nerves lengthen and harden into thorns (Holly, fig. 93 ; Barberry, fig. 94) ; in Berberis, the leaves, which first appear after germination are provided with parenchyma like ordinary leaves, and the base of their petiole is furnished with two little stipules ; but on the subsequent branches the stipules harden, lengthen into spines, and the leaf itself is reduced to one III. Burberry. Spiny leaves. P2. Sundew. C'ilinto leaf. 93. Holly. Spiny leaf. 95. Ooiwflicrry. Spines. or three thickened and spinous nerves, from the axils of which short branches, bearing ordinary leaves, are developed. In the Gooseberry (fig. 95) the three or five spines (c) which spring below the leaves (f) may be con- sidered as a development of the pulvinus of the leaf. Divisions of Leaves. — The leaf is entire (f. integrum) when its blade is quite undivided (Oleander, fig. 82) ; — cut when its edge, instead of being a continuous line, presents a series of broken 06. Chestnut. Dentate leaf. 97. Archi.ngel. Serrated Itfaf. US. Klin. liiilontatc !<>af. f»3. Hawthorn. Incised leaf. lines, owing to the parenchyma not accompanying the nerves to their extremities (Chestnut, Oak, Haivthorn) ; — dentate or toothed (f. dentatum) when it has sharp teeth THE LEAVES. 27 with a rounded sinus ; it is the slightest way in which a leaf can be cut (Chestnut, fig. 96) ; — crenate (f.crenatum) when it has rounded teeth and a sharp sinus (Ground ivy, fig. 87); — serrate (f. serratum) when the sinus and teeth are sharp and turned towards the tip of the leaf, like the teeth of a saw (White Archangel, fig. 97) ; — doubly -dentate or -crenate or -serrate (f. duplicato-dentatum, &c.) when the teeth or crenatures are themselves toothed or crenate (Ety, fig. 98) ; — incised (f. incisum) when the teeth are very unequal, and the sinus sharp and deep (Hawthorn, fig. 99) ; — sinuate (f. sinuatum), when the divisions (deeper than teeth) and the sinus are large and obtuse (Oak, fig. 100). The divisions of the leaf are called lacinicB1 (laciniw), when acute, and separated by an acute sinus, which reaches half-way to the middle of the blade. If the nerves are pinnate, the laciniee are so also, and 100. Oak. Sinuate leaf. 102. Castor-oil. Palmatifld leaf . 101. Dandelion. Pinnatifid ruiiciuate leaf. 103. Poppy. Pinnatipartite leaf. the leaf is pinnatifid (f. pinnatifidum, Artichoke) ; — if palmate, so also are the lacinise, and the leaf is palmate (f. palmatifidum, Castor-oil, fig. 102). A pinnatifid leaf of which the lacinise point downwards, is called runcinate (f. runcinatum, Dande- lion, fig. 101). The divisions of the leaf are called partitions (partitiones), when the sinuses extend beyond the middle, and nearly reach the midrib or the base of the blade ; according to the nervation the leaf is then pinnatipartite (f. pinnatipartitum, Poppy, fig. 103), or palmatipartite (f. palmatipartitum, Aconite, fig. 104). The divisions of the leaf are called segments (segmenta), when the sinuses extend to the midrib or to the base of the blade; then, according to the nervation, the leaf is pinnatisect (/. pinnatisectum, Watercress, fig. 105) or palmatisect (f. palmatisectum, Cinq-foil, fig. 106 ;2 Strawberry, fig. 107). The divisions are termed lobes (lobi) when the sinuses 1 There are no current exact equivalents for the substantive terms laoinies, partitions, segments, and lobes of this work; though when rendered into adjectives we usually apply lobes to divisions which descend to or about the middle of the leaf, and segments to divisions to or near the base. — ED. 2 The Strawberry and Cinq-foil have undoubted compound leaves. — ED. 28 ORGANOGRAPHY AND GLOSSOLOGY. are as long as those of the laciniae or partitions or segments, and when the divisions, of indefinite depth, are rounded ; according to the arrangement of its nerves the leaf is then said to be pinnately lobed (f. pinnatilobatum, Ooronojnu, fig. 108), or palmately lobed (f. palma tilobatam, Maple, fig. 109). 104. Aconite. Palmtpartite leaf, 105. Watercress. Piiinatiaeot leaf. lOfi. Cinq-foil. Piilmatisevt leaf. The leaf is lyrnte (f. lyratum), when, being pinnati -fid, -partite, -sect, or pinnately lobed, it terminates in a rounded division, much larger than the others (Turnip, fig. 110) ; — pedate (f. pedatum), when its lobes, segments, partitions, or laciniec diverge ' from the base ; this occurs when three palmate '/7 divisions spring from the petiole, their midrib remaining undivided, whilst the two lateral l\ nNjUl produce on each side one or two parallel VU \y divisions, which are perpendicular to that NXl/ from which they spring (Hellebore, fig. 111). y The same leaf is often variously divided ; ^ thus the segments of the lower pinnatisect leaves of Chelidonium (fig. 112) are lobed, sinuate, crenulate, and dentate ; the lower leaves of Aconite (fig. 104) are palmi-partite, with bifid or trifid partitions, and incised and toothed laciniae; the lower leaves of Herb- Robert (fig. 113) are palmatisect, with trifid 107. strawixn-y. i^in.atisect leaf. segments and incised and toothed lacinice ; the laciniae being rounded and abruptly terminated by a small point, and said to be apiculate (I. apiculatas). The Castor-oil (fig. 102), Poppy (fig. 103), Cinq-foil (fig. 106), and Maple (fig. 109), have toothed divisions. Compound leaves. — A leaf is simple (f. simplex), however deeply cut its divisions may be, when these cannot be separated from each other without tearing, as in most of the leaves mentioned above. It is compound (f. compositum), when its component divisions can be separated without tearing; and its divisions are named leaflets 108. Coronoim*. I'cnuili)lK.-U leaf. THE LEAVES. 29 (foliola). The petiole of a compound leaf is the common petiole (p. communis], and that of each leaflet is a petiolule (petiolulus). m 109. Maple. Palmately-lobed leaf. 110. Turnip. Lyrate leaf. 112. Chelidonium. Pennilobed leaf. A leaf is simply compound, wlien the leaflets, whether petiolulate or not, spring directly from the common petiole ; and, according to its nervation, the leaf is 111. Hellebore Pedateleaf. 113. Herb-Robert. Palmatisect leaf. 114. Robinia. Pinnate leaf. pinnate (/. pinnatum, Robinia, fig. 114) or digitate (/. digitatum, Horse-chestnut, fig. 115 ; Lupin, fig. 116). When there are but few leaflets, their insertion must 30 ORGANOGRAPHY AND GLOSSOLOGY. l'i. Horse chestnut. Digitate1 leaf. 117. Melilotus. Pinnate leaf. 9 118. Trefoil. Digitate leaf. 11C. Lupin. Digitate leaf. 119. Gleditsfhia triac anthoe. Bipinnatc leaf. 120. Actsea splcata. Tripinnate leaf. 121. AcUea raccuiosa. Tritemutj leaf. THE LEAVES. 31 be carefully observed: thus the Melilot (fig. 117) has apirmately tri-foliolate leaf, but the Trefoil (fig. 118) a digitately ternate1 leaf, all the leaflets springing from the top of the petiole. The leaf is bipinnate (f. bipinnatum), when the secondary petioles, instead of each ending in a leaflet, form so many pinnate leaves (Gleditsckia triacanthos, fig. 119) ; tripinnate (f. tripinnatum) , when the secondary petioles bear as many bipinnate leaves (Actcea spicata, fig. 120) ; tri-ternate, when the common petiole bears three secondary petioles, which each bear three tertiary petioles, each of which again bears as many digitately tri-foliolate leaves (Actwa racemosa, fig. 121). A pinnate leaf with all its leaflets in lateral pairs is termed pari-pinnate (f. pari-pinnatum) ; when in addition it is terminated by a solitary leaflet, the leaf is impari-pinnate (f. impari-pinnatum., Kobinia, fig. 114). 122. Cancalis. Decompound leaf. 12:f. Potato. Interruptedly pinnate leaf. 124. Agrimony. Pinnatiseet leaf. 12"). Orobns. Pinnate leaf with unequal leaflet changed into a very short filament. A leaf is laciniate or decompound (f. laciniatum, decompositum) , when, without being really compound, it is cut into an indefinite number of unequal laciniae (Caucalis Anthriscus, fig. 122; Water Crowfoot, fig. 71), as in most umbelliferous plants (Parsley, Chervil, Hemlock, Carrot, Angelica, &c.). A leaf is interruptedly-pinnate or -pinnatisect (f. interrupti-pinnatum, -pinnati- sectum], when the leaflets or divisions are alternately large and small (Potato, fig, 123; Agrimony, fig. 124). Tendrils. — Tendrils (cirri) are thread-like, more or less irregularly spiral organs, which usually coil round neighbouring bodies, and thus support the plant. The leaf is cirrhose (f. cirrosum), when one or more of its leaflets is reduced to its median nerve, and becomes a tendril. In the Bitter Vetch (fig. 125), the tendril is simple and very short, because it is only the terminal leaflet which is thus transformed. In the Pea (fig. 126), and in Vetches (fig. 127), the three terminal leaflets are changed into tendrils. In another Vetch (Lathy rus Aphaca, fig. 128) all the leaflets are suppressed, and the whole leaf is reduced to a filament without parenchyma (v); in 1 More correctly a digitate]}- tri-foliate leaf. — Er>. 32 ORGANOGRAPHY AND GLOSSOLOGY. compensation, the stipules (s, s) are very much developed, and perform the office of leaves. In Smilax (fig. ] 29), the petiole bears two lateral tendrils below the single . a 128. Aphaca. ivti..hir temlriU. 126. Pea. I-oaf w ith tendril* funned from leaflet*. 130. Vine. Tendrils formed from peduncle*. cordate blade, which may be regarded as the lateral leaflets of a compound leaf, reduced to their median nerves. The lateral position of the solitary tendril in the Melon (fig. 61) and other Cucurbitacece, together with the fact that two tendrils occasionally occur, one on each side of the leaf, has led most botanists to regard it as a stipule, of which the corresponding one is suppressed ; but the occurrence of two tendrils is very rare, and these are never precisely on the same level. On the other hand, unlike a true stipule, the tendril of Cucurbitacece is derived from a vascular bundle remote from that which produces the leaf, and is separated from the petiole of the latter by buds. Upon I2!t. Smilax. Stipulary tendrils. 127. Vetch. Pinhnte leaf with foliolar ten- dril* and winged i«-ti" • . INFLORESCENCE. •33 the whole, the simplest explanation of the tendril of the Melon is, that, unlike that of the Pea and other Leguminosse, it represents a leaf, reduced to one or more of its nerves : thus, when simple, it represents the petiole and mid-rib ; when branched, it represents the principal nerves of the leaf, which are themselves palinately divided. In the Vine (fig. 130) the tendril is leaf-opposed, and formed of a branching peduncle (v, v), of which the pedicels are suppressed, but which sometimes bears imperfect flowers. INFLORESCENCE. This term (inflorescentia) is used in two senses, signifying both the arrange- ment of the flowers upon a plant, and a collection of flowers not separated by leaves properly so called ; the latter being the more special meaning of the term. The organs of inflorescence are, (1) the supports of the flowers, peduncle, pedicel, receptacle ; (2) the bracts (bractew), or altered leaves, from the axils of which the floral axes spring, and which are altered in colour and form, as they ap- proach the flower ; these are some- times absent (Stock and other Oruciferce) . The peduncle (pedunculus) is a branch directly terminated by a flower; and its extremity forms the receptacle (receptaculum) . This name is also given to a more or less branched flowering axis, differing in appearance from the rest of the stem, bearing bracts, and of which the ultimate divisions are called pedicels (pedicelli). Bracts vary in shape ; they are usually small (Currant, fig. 132), and inay be thin, transparent, and membranous (br. membranacece) ; or thin, dry, stiff, coloured, and scarious (br. scariosce, Geranium) ; or coloured, like petals (Bugloss) ; they are very large in the Lime (fig. 131), which is peculiar in having the peduncle adnate to the midrib of the bract, and, though really axillary to it, appearing to rise from its centre. The primary axis of the inflorescence is the common peduncle, whence spring the secondary, tertiary, &c. axes, according to their order of development. The inflorescence is axillary (inf. axillaris], when the primary axis, instead of terminating in a flower, is indefinitely elongated, and the flowers are borne upon secondary axes, springing from the axils of its leaves (Pimpernel, fig. 30) ; it is terminal (i. terminalis), when the primary and secondary axes both terminate in a flower (Poppy, Columbine, fig. 31). 123. Currant. Simple 131. Lhne. Bract joined to the peduncle. 34 OEGANOGRAPHY AND GLOSSOLOGY. In every inflorescence the flowers are solitary (fl. solitarii), when each peduncle is undivided, and springs directly from the stem, and is isolated from the others by normal leaves (Pimpernel, fig. 30). Inflorescence, in its restricted sense, consists of a group of pedi- celled flowers, bracteate or not, all springing from a common peduncle which bears no true leaves. Indefinite inflorescences are — the raceme, corymb, umbel, spike, and head. I. The raceme (race- mus) is an inflorescence of which the nearly equal secondary axes rise along the primary axis ; it is simple, when the pedicels spring directly from the primary axis, and terminate in a flower (Lily, Lily of the Valley, Snapdragon; Cur- rant, fig. 132 ; Mignonette, fig. 133) ; it is compound, 133. Mignonette. Simple panicle. an(J caUe(J a panicle (pani- 134' Yucca Glorloea. Branch of compound panicle. cula), when the secondary axes branch once or oftener before flowering (Yucca Gloriosa, fig. 134). A thyrsus (thyrsus) is a panicle of an ovoid shape, the central pedicels of which are longer than the outer ones. 135. Cerasus Mahaleb. Indefinite corymb. 136. Cherry. Simple umbel. 137. Fennel. Umbel and umbeUutae without involucre. 2. The corymb (corymbus) resembles the raceme, but the lower pedicels are so much longer than the upper, that the flowers are nearly on a level (Cerasus Mahaleb, INFLORESCENCE. 35 fig. 135). In the Stock and many allied plants, the inflorescence is at first a corymb, but changes to a raceme as the primary axis lengthens. 3. In the umbel (umbella) the secondary axes are equal in length, and starting from the same point, flower at the same height, diverging like the rays of a parasol ; it is a raceme of which the primary axis is reduced almost to a point. The umbel is simple (sertulum), when the secondary axes flower (Cherry, fig. 136) ; it is com- pound, when these bear umbellately arranged tertiary axes, called partial umbels (umbellulce, Fennel, 138. Carrot. Umbels with in.olucre ; umbellate with inyolucels. %' W> Carrot> Parsley, fig. 139). 138 5 139. JEthusa. Umbel without involucre ; umbelluTce with involucels. The bracts, which in most racemes spring, like the pedicels, from different heights, in many umbelliferous plants rise on a level, like the secondary and tertiary axes, and form a whorl. The name involucre (involucrum) is given to the bracts at the base of the umbel 140. Plantain. Simple spike. 141. Vervain. Simple spike. 142. Wheat. Compound spike. 143. Oat. Panicle of spikelets. (Carrot, fig. 138), and that of involucel or partial involucre (involucellum) to the D 2 36 ORGANOGKAPHY AND GLOSSOLOGY. bracts at the base of the partial umbel (Fool's Parsley, fig. 139). and involucel may be absent (Fennel, fig. 137). 4. In the spike (spica], the flowers are sessile or subsessile on the primary axis (Plantain, fig. 140 ; Vervain, fig. 141). In the compound spike (s. composite) the secondary axes each bear a small Both involucre 114. Willow. StamlnifbTons catkin. 145. Willow. PUtilliferoui catkin. 14(5. Oak. Stamlnifcrous catkin. 14!t. Arum. Spadix pxpofed by the removal of part of the spntbe. distichous spike (spikelet, Wheat, fig. 142). In many grasses, the spikelets are borne on long branching pedicels, forming a panicle (Oat, fig. 143). The catkin (amentum) is a spike, the flowers of which are incomplete (i.e. they want either stamens or pistil), and which is deciduous when mature (Mulberry; Willoiv, figs. 144, 145; Oak, fig. 146). The cone (strolilus) is a catkin with large thick scales, principally found on certain evergreen trees, hence named Conifers (Pine, fig. 147). The spike of the Hop (fig. 148) is a cone with large membranous bracts. The Kpadix (lyyadix) is a spike of incomplete flowers, which, when young, is enveloped in a large bract or tspathe (spathd). The axis of the spadix sometimes flowers throughout its length, sometimes the upper portion is flowerless (Arum, fig. 149). The branched spadix of Palms is called a ' regime ' (in French). 5. In the head (capi- tulum) the flowers are collected into a head or depressed spike, of which the primary axis is vertically contracted, thus gaining in thickness what it has lost in length (Scabioiis, fig. 150 ; Trefoil, fig. 151), and the 117. Pine. Cone. 148. Hop. Cone. INFLORESCENCE. 37 depressed axis is called the common receptacle (clinanthium) . As in the mnbel, the head is usually bracteate, each flower springing from the axil of a bract. There 150. Scabious. (Japitulum. 151. Trefoil. Capital uin. 152. Marigold. Capitulnm with involucre. should hence be as many bracts as flowers, but, owing to the crowding of the flowers, some of the bracts are usually suppressed. The outer bracts, or those below the outer flower, form the involucre (w-- volucrum, periclinium, Marigold, fig. 152). The bracts of the centre flowers are usually reduced to scales, bristles, 153. Camomile. Paleate receptacle, cut vertically. 154. Cornflower. Bristly receptacle, cut vertically. 155. Onopordon. Alveolate receptacle, cut Vertically. or hairs. The receptacle is paleate (r.paleatum), when covered with scale-like bracts separating the flowers (Camomile, fig. 153) ; — setose (r.setosum), when these are bristly ; such are often cut into fine hairs (Cornflower, fig. 154) ; — pitted (r. alveolatum}, when the flowers are seated in depressions, separated by variously shaped membranes, which represent the bracts (Onopordon, fig. 155). When these inner bracts are absent the receptacle is described as naked (r.nudum, Dandelion, fig. 156). Sometimes the base of the head is naked, or only protected by some normal leaves (Trefoil, fig. 151), but each flower may still be accompanied by a bract. The inflorescences of Dorstenia Contrayerva, and of the Fig (hypanthodium), are also heads. In Dorstenia (fig. 157) the receptacle is much depressed or slightly 38 OKGANOGKAPHY AND GLOSSOLOGY. 157. Dorstenin. 1JV6. Dandelion. Naked m-eptacle. 158. Fig. Cut vertically. concave, bearing incomplete flowers inserted in pits with ragged edges ; in the Fig (fig. 158) the inflorescence is similar, but the receptacle is still more concave, inso- much that the male flowers, which are at the top of the fig, answer in position to the lowest flowers of the primary axis, and the small scales (bracts) at the mouth represent an involucre, which in the normal state would gird the base of the common recepta- cle, as in an or- dinary head. It is obvious that every indefi- nite inflorescence must be a modifi- cation of the ra- ceme ; thus the corymb is a ra- ceme with unequal secondary axes, reaching the same level ; an umbel is a raceme whose primary axis is undeveloped; the spike is a raceme whose secondary axes are undeve- loped; the capitulum is a spike with the primary axis vertically thickened and dilated. The difference between the raceme, corymb, umbel, spike, and head being simply due to the amount of development of the primary and secondary axes, these terms cannot be precisely limited, and intermediate terms are therefore frequently resorted to; as spiked racemes and panicles, when the pedicels are very short ; a globose spike approaches the head ; and an ovoid or spiked head approaches the spike. Amongst Trefoils, capitulate, spiked, and umbelled flowers all occur. In the raceme, panicle, corymb, and spike, the pedicels flower from below up- wards, i.e. the lowest flowers open first. In simple and compound umbels, the outer flowers open first ; whence we may conclude that the umbel is a depressed raceme. In the head, as in the depressed spike, the flowers really open from below up- wards, but as the surface of the inflorescence in both these cases is nearly horizontal, they appear to open from the circumference to the centre, and are called centripetal, a term which is applied to every indefinite inflorescence, whether the flowers open from below upwards, or from without inwards. Definite Inflorescences. — These are all included under the general terra cyme (cyma), however much they may be branched ; they are, the definite- or cy mose-raceme ; true corymb ; umbellate-cyme ; iipicate-cyme, scorpioid cyme ; and contracted cyme, which comprises ike fascicle and the glomende. 1. In the definite- or cymose-raceme (Campanula, fig. 159), the flowering pedicels are of nearly equal length, as in the raceme ; from which it differs in the primary axis (A, A, A), terminating in a flower, which is necessarily the first to expand ; INFLORESCENCE. 39 whilst of the secondary axes (B, B, B), the lowest, being the oldest, flowers first ; and the tertiaries (c, c, c), although often lower than the axis whence they spring, flower last. The result is, that of the expanded flowers some are above, some below the buds, according to the order of the succession of their axes. When examining such inflorescences, the student must look for the axis terminated by a flower, for the lateral leaf or bract which it bears, and for the shoot or secondary axis which springs be- tween this axis and itself. 159. Campanula. Cymose raceme. 160. Cerastium. Dichotomous cyme. 161. Hawthorn. Definite corymb. The racemose cyme is called a panicle or thyrsus when much branched (Privet] ; but in reality the difference between the definite raceme and panicle is not analogous to the difference between the indefinite raceme and panicle, for the indefinite raceme consists of a primary and many secondary axes ; while the indefinite panicle consists of primary, secondary, tertiary, quaternary axes ; just as is the case both in the definite raceme and definite panicle; the only difference between these two, then, is in appearance. The definite raceme becomes a dichotomous cyme., when the primary axis termi- nates in a flower between two opposite leaves or bracts, from the axils of which spring two secondary axes, each again terminated by a flower between two bracts, from the axils of which spring two tertiary axes, and so on (Cerastium, fig. 160) ; this evo- lution of subordinate axes, each terminating between two opposite axes, is continued till the last axis fails, from deficient nutrition, to repeat the process. When, instead of two opposite leaves or bracts, there are three in a whorl below each successive central flower, with again three in their axils, the cyme becomes trichotomous. 2. In the definite (or true) corymb, the different flowering axes, although of unequal length, attain pretty much the same level (Hawthorn, fig. 161). In the definite raceme and the corymb, the central flowers are first developed ; in other words, the flowers open from within outwards, or centrifugally. 40 ORGANOGRAPHY AND GLOSSOLOGY. 3. In the definite umbel or umbellate cyme the pedicels appear to start from the same point as in the indefinite umbel, but the central flowers open first, and the outer pedicels are evidently the youngest and shortest : being a definite umbel, flowering centrifugally, it is truly a cyme (Chelidonium, fig. 162). 4. The definite spike or xpicate-cyme (Sedum, fig. 163) 1«2. ChelMonlnm. Definite uiuU-1. 163. Sctiiiiii. Spicate cyme. 164. MyosotU. Scorpioid cyme. 1 is composed of a succession of independent axes, alternating to the right and left, each terminating in an apparently sessile flower. 5. The scorpioid cyme (MyoKotis, fig. 164) is a raceme which rolls up in a cro/ier shape, like the tail of a scorpion ; it is composed of a / succession of in- dependent axes, which do not al- ternate right and left, but form an 165. Theoretical figure of the scorpioid cjme. interrupted lllie, which tends to turn back upon it- self; in this iii- florescence, the bracts are usually suppressed (fig. 165). 6. In the con- 166. Box. Glomerule. traded Cyme the flowers are crowded, owing to the extreme shortness of the axes; it is called fascicled, when the axes are somewhat lengthened, and are regularly distributed 167. I. am in rn. Fatcirlca on an indefinite »tem . INFLORESCENCE. 41 (Sweet William] ; — glomerate, when the axes are almost suppressed, and extremely irregular (Box, fig. 166). Mixed inflorescences are those in which the definite and indefinite both appear. In the Labiates (Lamium, fig. 167) the general inflorescence is indefinite, while 168. Mallow. Fascicle on an indefinite stem 16!i. Groundsel. Capitula in a corymb 172. Butcher's Broom. Epiphylkms flowers. 170. Heartsease. Single-flowered cyme. 171. Bindweed. One- and two-flowered cymes. the separate heads are true axillary cymes or fascicles. In the Mallows the same arrangement occurs (fig. 168). In Composites (Groundsel, fig. 169) the general inflorescence is a definite corymb, and the separate portions are heads. The definite inflorescence is sometimes reduced to a single flower, and resembles the one-flowered pedicels of an indefinite inflorescence (Heartsease, fig. 170) ; but a little below the flower two small bracts (bracteoles) will be found, in the axils of which are two obvious or suppressed shoots, which sometimes flower (Bindweed, fig. 171). The two bracteoles of a one-flowered pedicel are therefore the evidences of a two- or three- flowered cyme, of which the primary axis only is developed. The inflorescence of certain plants Jias been called epiphyllous, from the flowers 42 ORGANOGRAPHY AND GLOSSOLOGY. appearing to spring from leaves or bracts. In the Lime (fig. 131), the peduncle is joined to the bracts. In Xylophylla the floral branch, dilated and flattened like a leaf, bears flowers along its edges. In the Butcher's Broom (fig. 172), as in Xylophylla, the peduncles, enlarged into green leaves, rise in the axils of small scales which are the true leaves, and bear on their centre one or more shortly pedicelled flowers, forming a cyme. THE FLOWER. The flower, in phaenogamic plants, is a collection of several whorls (usually four), formed of variously modified leaves arranged one above another in rings or stages, so close that their internodes are not distinguishable. The leaves which form each floral whorl are not always precisely on the same level, but often form a close spiral, and consequently not a true whorl ; the term whorl is, however, always applied to the calyx, corolla, andrcecium, and pistil. The flower may be regarded as a true shoot, terminating the peduncle or pedicel, and therefore terminal as regards the branch from which it springs : limiting the growth of that branch. Its terminal position may be theoretically explained by supposing that the floral whorls exhaust the supply of nutri- ment provided by the axis, and with this the vegetative force necessary to prolong it. In the normal condition of the flower, the re- productive and nutritive forces are in equili- brium ; but there are cases in which this .... . ,. , , , , . , . , ,, . '74. The name row cut equilibrium is disturbed, and in which the axis vertically, and depriv.-d lengthens beyond the floral whorls, and re- petals, to show "the i xl 1 A U_ 1_ 1.1.1 • VU P°»itlon of a11 the parts produces the plant by branch- buds ; in which »iong the axi«. cases the seed-buds are usually suppressed : this is seen in many plants, and especially in proliferous roses (fig. 17-J), of which the peduncle is prolonged into a supplementary axis, ending usually in an imperfect flower (fig. 174) of sepals (s) and petals (P), in the middle of which are a few imperfect stamens and carpels. The variously transformed leaves composing the floral whorls, though modified in tissue, colour, and texture, to form the calyx, corolla, androecium, and pistil, sometimes reveal their origin by resuming the aspect of normal leaves. The term anomaly or monstrosity is given to casual departures from the normal structure occurring in animals and plants, which anomalies are most frequently induced by cultivation. The first whorl or calyx, being the exterior, and therefore the nearest to the leaves, resembles these most. The second whorl or corolla is more altered j the tissue of its petals is more 178. Proliferous rose. C,c, calyx transformed Into leaves ; r, petals multiplied :it the expense of the stnineiis ; A, prolonged axis bearing an imperfect flower; F, coloured blades representing abor- tive carpels. THE FLOWER. 175. Transformation of stamens in roses. showing one series of anthers transformed and connected together. delicate, and their colour more brilliant, but their claw, limb, and nerves, and their usually flat shape, all reveal their foliar nature. The third whorl, or androsciiim, bears much analogy to the second ; the relative position of the stamens and petals is always the same, and these sometimes present an insensible transition from one to the other; as in semi-double flowers, where some of the stamens are changed into petals ; in partially double flowers, where all the stamens are so changed; and in full double flowers, where the carpels also have become petaloid (Ranunculus, Columbine, Rose). In Rosa centifolia (fig. 175), par- ticularly, the successive steps by which a stamen becomes a petal are obvious ; sometimes the anther enlarges, and one cell reddens (6) ; or both cells lengthen (5) ; or the connective reddens and dilates, and bears on one side a yellow scale, which recalls an anther- cell (4, 3) ; oftenest the stamen expands at once 17(i Hoo7eiT columbine, into a complete petal (2) ; sometimes (1) the proximity of the calyx seems to influence this petal ; a green midrib traverses its coloured blade, and it becomes sepaline in the middle, petaline on the sides. In the double Columbine (fig. 176), the anther swells, and forms a hooded petal; and some- times, but more seldom, the filament dilates into a flat petal. The fourth whorl or pistil is the central; its position and the pressure of the surrounding organs influence its form in many ways, and hence disguise its origin ; but when the carpellary leaves are free (Columbine, fig. 12), or solitary (Pea, fig. 14), their foliaceous nature is obvious, and especially in anomalous cases, as the following. Anomalies. — In the Columbine (fig. 177) the five carpellary leaves (F.C) instead of being folded to form a protecting cavity for the S I young seed, have been found to remain flat, and bear along their edges (or placentas) small leaf-buds (F.O) ; these buds, which nor- M Pi m. mally would have contained an embryo, were mostly open ; some few, though empty, were curved, and suggestive of their normal function ; fertili- zation had not taken place, ;c.aud the unfertilized stigma was reduced to a small glan- dular head (St), terminating the midrib of the carpellary leaf. In the double Cherry (fig. 178), the free edges of the two carpels (F.C) bear no buds, and their blade or ovary, which altogether resembles an ordinary leaf, folded along its midrib (N.m), is lengthened into a style-like neck, terminated by a spongy tubercle representing the stigma. St Fc/ 177. Monstrous Columbine. 178. Double Cherry. Flower cut vertically ; s, sepals ; p, petals ; F.c, carpellary leaves ; N.m, median nerve or style. OEGANOGEAPHY AND GLOSSOLOGY. The Alpine Strawberry (fig. 179) presents a curious metamorphosis of the floral whorls. The calyx (s) is normal, the five outer leaves are bifid, and accurately represent the stipules of the leaves. The petals (p) appear as green, strongly veine'd, nearly sessile leaves J 183. Alpine Strawberry. 179. Alpine Strawberry. 180. Alpine Strawberry. 181. Alpine Strawberry. 182. Alpine Strawberry. Carpel without the Green petal (mag.). Green stamens. Carpel (mag.). ovary (mag.). with five acute ciliate lobes (fig. 180). The twenty stamens (fig. 179, E) are arranged in four whorls, and are also expanded into green petioled simple or three- lobed leaves (fig. 181) ; most of them bear on each side of the base of the blade a yellow boss (A, A), representing a suppressed anther. The carpels (fig. 179, c), which have also reverted to leaves, are arranged spirally on a receptacle, which becomes succulent as the green flower grows. The carpellary leaf (fig. 1 82 F.C), the integument of the seed (F.O), called the ovulary leaf, and the embryo are transformed through excessive development into overlapping leaves. Of these, the outer leaf, often bifid (P.C), represents the ovary; its base sheaths the inner leaf (fig. 183, F.O), which should have formed the outer integument of the ovule. At the inner base of this ovulary leaf (183, F.O) is a pointed shoot (P) ; this is the embryo, of which a vertical section (fig. 184) shows rudimentary leaves or cotyledons (co) and a plumule (G). In this curious flower, an excessive supply of nutrition has deranged the reproductive organs, and the whorls, which should have been modified in 184. Alpine Strawberry. Carpel cut •vertically. 185. Rumex. Flower with a double calycoid perianth. 186. Lily. Flower with a double petaluid perianth. Flower with a double petaluid perianth, furnished with a cup simulating a corolla. subservience to the function of reproduction, have preserved their original form of green leaves. Such a metamorphosis of all the floral organs into ordinary leaves is not uncommon throughout the Vegetable Kingdom ; it is called chloranthy. THE FLOWER. 45 An incomplete flower (fl, incompletus) is one in which calyx, or corolla, or androecium, or pistil is absent. The single or double whorl which surrounds the androecium and pistil (or essential organs of the flower) is called a perianth ( perianthium. perigonium) . A dichlamydeous flower (fl. dichlamydeus) is one with a double perianth, i.e. with two whorls, calyx, and corolla (Wallflower, fig. 7); which are similar in form or colour or not. When both whorls are green and calyx-like (Rumex, fig. 185), the perianth is called calycoid, calycine, or foliaceous (p. foliaceum), and when both are coloured or corolla-like (Lily, fig. 186), it is called petaloid (p.petaloideum). In Nar- cissus (fig. 187) there is a fringed cup within the petaloid perianth, which is greatly developed in the common species here figured, but is much less so in the Narcissus poeticus, and other species. In these latter it is cut into six lobes, alternating with those of the double perianth, whence some botanists have concluded that it represents two confluent whorls analogous to the outer ones. Others regard this cup of Narcissus as formed by lateral expansion of the confluent filaments. In Orchis (fig. 188) the petaloid 188. Orchis. Flower with a double irregular petaloid perianth. 18!). Chenopodium. Monoperianthed flower. 191. Ash. Naked flower. 190. Aristolochia. Monoperianthed flower with irregular perianth. 192. Carex. J? flower. perianth has six unequal, spreading lobes, of which the upper are erect and form the hood (galea) ; the lowest is dilated, variable in shape, and called the lip (labellum) ; it is sometimes produced into a sac, or spur (calcar). A monochlamydeous perianth (p. simplex) is usually con- sidered as a calyx, and the flower is said to be apetalous (fl. apetalus). It may be foliaceous (Chenopodium, fig. 189), or petaloid (Anemone, fig. 230), or irregular (Aristolochia, fig. 190). An achlamydeous flower (fl. achlamydeus) has neither calyx nor corolla ; it may be protected by one or more bracts (Carex, figs. 192, 193), or altogether unprotected (fl. nudus, Ash, fig. 191). A hermaphrodite flower (fl. hermaphroditus, $) possesses both androecium and pistil (Wall/lower, fig. 7) ; — the flower is male (fl. masculus, $ ) when it has androecium without pistil (Carex, fig. 192) ; — -female (fl. foemineus, $ ), when it has pistil without androecium (Carex, fig. 193) ; — and neuter or sterile (fl. sterilis, neuter}, when it has neither androecium nor pistil (outer flowers of the Corn/lower, fig. 194); — 193. Carex. 9 flower. 46 ORGANOGRAPHY AND GLOSSOLOGY. monoecious (fl. monoid), when the male and female flowers are on the same plant (Carex, figs. 192, 193; Oak, fig. 146; Hazel-nut, fig. 195, 195 big, 195 tar; Arum, figs. 196, 194. Cornflower. Neuter flower. 19S 6i>. Filbert. J flower. 199. Willow. ,? flower. l nut. M..U.I ri.,u- flowers. 1%. Anim. Monoecious flow-pro. Spa- dix U'lirintf below the pistilliferoufl flowera, above tbc Htaminiferoiia, and ti-rin iiiiitol by a club- shaped prolongation. 195 ttr. Filbert. 9 flower. 202. MorcnrinUs. 9 flower. 197, 198) ; — dioecious (fl. dioici), when on separate plants (Willow, figs. 199, 200 ; Dog's Mercury, figs. 201, 202); — polygamous (fl. polygami), when hermaphrodite flowers occur amongst the male or female (Pellitory). The general term diclinous (diclinus) is applied to monoecious, dioecious, and polygamous flowers. THE CALYX. The calyx (calyx) is the whorl placed outside of the corolla and andrcecium. It is usually simple (Wallflower), sometimes double (Magnolia, Trollius) ; its component leaves are termed sepals (sepala). It is poly- sepalous (c. polysepalus), when its sepals are wholly separate (Wallflower, fig. 8 ; Colum- bine, fig. 31) ; gamo- or mono-sepalous (c. gamo- or mono-sepalus), when its sepals cohere more or less. A monosepalous calyx is partite (c. partitus), when the sepals are united at the base only ; and it may be bi- tri- multi-partite (Pimpernel, fig. 203) ; — it is bi- tri- multi-fid, when the sepals cohere about half-way up (Comfrey, 203. Pimpernel. Five-partite calyx and pistil. 204. Erythroea. Five-fid calyx. THE CALYX. 47 Erythrcea, fig. 204) ; — it is bi- tri- multi-dentate or -toothed (c. dentatus), when the sepals are united nearly to the top (Lychnis, fig. 205). In the monosepalous calyx, the connected portion of the sepals is the tube (tubus), the free portion the limb (limbus), and the point of union of these the throat (faux) . Sepals are sometimes prolonged into appendages at the base, as in Myosurus (fig. 206) and Heartsease (fig. 500), where the five sepals are attached to the receptacle by their 206. Myosurus. Flower with appcndiculate calyx. 207. Campanula. Appendiculate calyx. 208. Lamium. Irregular calyx. 209. Larkspur. Calyx prolonged into a hollow horn. centres ; in some Campanulas (fig. 207) the appendage is formed by the union of two lobes belonging to two contiguous sepals, between which it is placed. The calyx is regular (c. regularis, cequalis), when its sepals, whether equal or unequal, form a symmetrical whorl (Wallflower, fig. 8; Pimpernel, fig. 203 ; Erythrcea, fig. 204 ; Lychnis, fig. 205) ; — it is irregular (c. irregularis, incequalis], when the whorl is unsymmetrical (Lamium, fig. 208). In the Aconite the upper sepal forms a hood ; in Larkspur (fig. 209) it is prolonged into a hollow horn or spur. In the Tropoeolum (fig. 210), the spur is formed by the united and lengthened three upper sepals. In Pelargonium the upper sepal is produced downwards, and forms a tube adherent to the pedicel. In Scutellaria the five sepals form two lips ; of which the upper 211. Scutellaria, Young calyx. 210. Troposolum. Flower with calyx prolonged into a hollow horn or spur. 212. Scutellaria. Eipe calyx. 214. Henbane. Urceolate calyx. 213. Winter Cherry. Vesicular calyx. protuberant one (fig. 211), after flowering, forms a shield to the ovaries, arching over them so as completely to envelop them, and meet the lower lip (fig. 212). The tube of the monosepalous calyx may be cylindric (cylindricus, Pink, fig. 226) ; — cup-shaped (cupuliformis, Orange) ; — club-shaped (clavata,claviformis, 8ilene,Armeria) ; = — bladdery (vesiculosus), when swollen like a bladder (Winter Cherry, fig. 213); — tur- binatt (turbinatus), when it resembles a top or pear (Black Alder); — bell-shaped 48 OEGANOGRAPHY AND GLOSSOLOGY. (campanulatus, Kidney-bean) ; — urceolate (urceolatus), when it resembles a small pitcher (Henbane, fig. 214). The calyx is connivent (s. conniventia), when the sepals bend towards each other (Ceanothus) ; — closed (s. da lisas), when their edges touch without joining (Wall/lower, fig. 8) ; — erect (s.erectas), when the sepals are vertical (Rocket, fig. •-Mi.. IV. I in. Frutt crowned by a calyx with toothed limb. 2U>. Quince. Fruit cut vertically. 217. lliuldcr. 218. Chrysan- 213. Hcliaiithemum. I'Util crowned themum. Flower Fruit crowned by a calyx with without a by a palcatcd calyx obsolete limb. oalyx. (mag.). 220. Valerian. Fruit crowned l>y a calyx with feathery toft (mag.). 250) ; — patent (s. patentia), when they spread horizontally (Mustard) ; — reflexed (s. reflexus), when turned back so as to expose their inner surface (Jiulbous Crowfoot). The calyx-limb may be petaloid (Iris) ; — foliaccous (Quince, fig. 215) ; — toothed (Fedia, fig. 216) ; — reduced to a small membranous crown (Field Camomile) — or ring (c. margo obsoleius, Madder, fig. 217) ; — or altogether suppressed (Chrysanthemum, fig. 218) ; in the latter case the calyx is said to be entire (c. integer), because its tube is considered to be confluent with the ovary, and undivided. The calyx-limb may be reduced to scales (tquamce or palea?, Helianthemum, fig. 219) ; or to radiating bristles or hairs, called a pappus (pap- pus). Such a pappus may be plumose (p.plumosus) when each of its hairs is covered with long secondary hairs or barbs visible to the naked eye (Va- lerian, fig. 220; Salsify, fig. 221) ; — simple (p. simplex) when the hairs or bristles are smooth and silky (Dandelion, fig. 222). The pappus, whether simple or plumose, is sessile (p.sessilis), when the hairs are inserted directly on the top of the ovary (Cornflower, Valerian, fig. 220) ; stipitate (p. stipitatus), when the calyx-tube is prolonged into a slender neck above the ovary (Dandelion, fig. 222; Salsify, fig. 221 ; Scabious, fig. 223). 222. Dandelion. Fruit crowned by a calyx with a limb in a simple tuft. 223. Scabious. Fruit <>|H'u (mag.). Calyx with a •tipitate tuft. r.'i. Fruit crowned by a calyx with a feathery toft. THE CALYX. 49 The calyx is deciduous (c. deciduus), when it falls with the corolla after flowering (Wallflower, fig. 8) ;— caducous or fugacious (c. caducus), when it falls as soon as 226. Pink. Calyx calyculate by opposite bracts. 230. Wood Anemone. Foliaceous one-flowered invxilucre. 224. Poppy. Young flower. Caducous calyx. 229. Scabious. Involucred fruit (mag.). 225. Mallow. Persistent calyx. 227. Mallow. Calycule of whorled bracts. 228. Strawberry. Flower with a calycule of stipules. the flower begins to expand (Poppy, fig. 224) ; — persistent (c. persistens), when it remains after flowering (Pimpernel, fig. 203) ; — marcescent (marcescens) , when it withers and dries up, and remains attached to the fruit (Mallow) ; — accrescent (c. accrescens), when it continues to grow after flowering (Winter Cherry, fig. 213). ' Calycules ' and Calyciform Involucres. — The calyx is sometimes accompanied by whorled or opposite bracts, simulating an accessory calyx ; to these have been given the name of calycule or outer calyx (calyculus). The Pink (fig. 226) has a ' calycule ' 50 ORGANOGRAPflY AND GLOSSOLOGY. of four bracts in opposite pairs. The Mallow (figs. 225, 227) has, outside the five-fid calyx, a caljcule of three bracts, and the Marsh Mallow one of six to nine bracts. The five green bodies beneath and adherent to the calyx of the Strawberry (fig. 228), and which alternate with the five sepals, are .not a calycule of bracts but of pairs of stipules belonging to the sepals. The pitted cup with fringed margins which encloses each flower of the Scabious (figs. 223, 220) may be considered a calycule. Calycules are true one-flowered involucres, ana- logous to the many-flowered involucres of heads and umbels. The following are also one-flowered involucres : the three foliaceous cut bracts of Anemone (fig. 230), placed far below the calyx ; — the three entire bracts of llepatica (fig. 231), also placed just below the calyx; — the many foliaceous bracts of the Winter Hellebore ( fig. 231 bis ), placed 231 lit. Winter Hellebore. Calyciform involucre near the flower. 231. Hepatica. Calvciform involucre near the flower. 2112. Oak. Fruit with a scaly cup. 2.'i/>. Euphorbia. ( 'nl.vciform many-flowered cup. 283. Filbert. Fruit* with follaceoua cup. 234. Chestnut. Prickly involucre, uuuuiujng three fruits. THE COEOLLA. 51 almost in contact with the calyx ; — the cup (cupula) of the acorn (fig. 232), which is composed of small imbricated scales ; — the foliaceous cup, with cut margins, of the Filbert (fig. 233). The prickly cup of the Chestnut (fig. 234), and the calyciform cup of Euphorbia (fig. 235), only differ from the preceding in being many-flowered. THE COROLLA. The corolla (corolla) is the whorl next within the calyx ; it is usually simple (Rose), sometimes double, i.e. composed of several whorls (Magnolia, Nymphcea) ; its leaves are petals (petala). Petals are usually coloured, that is, not green like the (usually foliaceous) sepals; some plants, however (Buckthorn, Vine, Narcissus viridiflorus) , have green petals, while others (Helleborus, Aconite, Larkspur, Columbine, Fennel) have coloured or petaloid sepals. In the polypetalous corolla (c. polypetala, dialypetala) the petals are entirely separate from each other ( Wallflower, Strawberry, Columbine] ; — in the monopetalous or gamopetalous corolla (c. mono- gamo-petala) the leaves cohere more or less, so as to form a corolla of a single piece. The corolla is regular (c. regularis), when its petals, whether free or united, are equal, and form a symmetrical whorl ; irregular (c. irregularis), when the reverse. A corolla may be formed of unequal divisions, and yet be regular ; this is when the petals are alternately large and small, the small being all alike and the large all alike ^ or when its divisions are oblique, but all alike, the whole corolla being still symmetrical (Periwinkle, fig. 274). Polypetalous Corollas. — The petals are clawed (p. unguiculata), when the broad part, or limb (lamina, fig. 9, L), is narrowed at the base into a petiole called the claw 236. Pink. Petal. 237. Banunculus. Petal. 238. Barberry. Petal. 239. Lychnis. Petal. (unguis, Wallflower, fig. 9 ; Pink, fig. 236) ; the petals of the Rose and Ranunculus (fig. 237) are shortly clawed ; those of the Philadelphus and Orange are sessile. The claw of the petal is nectariferous (u. nectarifer), when it bears a honey- secreting gland (Ranunculus, fig. 237) ; this gland may be protected by a scale (fig. 237), or naked (Barberry, fig. 238) ; and the claw itself is naked (u. nudus), when it bears neither gland nor scale (Wallflower, fig. 9; Pink, fig. 236); the claw is winged (u. alatus), when it bears a longitudinal membrane on its inner surface (Rose Campion). Little pits (fornices) are often found at the point of junction of the claw H 2 52 ORGANOGRAPHY AND GLOSSOLOGY. and limb, or forming small swellings inside the tube (Lychnis Chalcedonica) ; they also sometimes occur in monopetalous corollas. Small scales, placed within and on 243. Hellelvwns. Tubular petal. •241. Nifrella. 244 Wx. Winter Aconlto. Two-llppcd petal. Two-lipped petal. 211. 242. Mignonette. Inner nnd lateral |>etals. 246. ColiimHne. Pct;il in u hood or cornucopia. 24S. Trolliua. Petal with one lip (mag.). 247. Aconite. Flower nnknl, without calyx ; petals liiHxktl, pcdicelled (mag.). the top of the claw, forming a sort of crown around the andrcccium and pistil, are collectively called a corona (coronula, Lychnis dioica, figs. 239, 240 ; Mignonette, figs. 241, 212). The limb of the petal may be entire (Wallflower, fig. 9), or toothed or fringed (Mignonette, figs. 241, 242). Petals are generally flat (p. plana], like the leaves ; but may be concave (p. con- cava, Barberry, fig. 238) ; — tubular with entire margins (p. tubulosa, H elleborus fcetidus, fig. 243) ; — bilabiate (p. bilabiata),or tubular with the mouth two-lipped (Nigella,fig. 244 ; Winter Aconite, fig. 244 bis) ; — labiate (p. labiata), when the tube terminates in a single lip (TroUius, fig. 245); — hooded (p. cucull if orrnia, Columbine, fig. 246; Aconite, fig. 247) ; — spurred (p. calcariformia), i.e. forming a spur or horn (Heartsease, fig. 248 ; 248. Heartsease. Flower cut vertically, showing the horn of the lower petal. 240. Larkrpar. l in a spur formed of four united petaU. 250. Rocket. Flower. 251, Chelidoninm. Flower. Larkspur, fig. 249). Hollow petals, of whatever form, usually enclose at the base a gland which is nectariferous when the flower expands, and the anthers open to shed their pollen. The regular polypetalous corolla is cruciform (c. cmriformis), when it consists of four petals placed crosswise (Rocket, fig. 250 ; Chelidonium, fig. 251) ; — rosaceous THE COROLLA. 53 (c. rosacea), when of five spreading, shortly-clawed, or sessile petals (Rose, Strawberry, fig. 252) ; — caryophyllaceous (c. caryophyllea), when of five clawed petals (Lychnis, figs. 239, 240). The irregular polypetalous corolla is papilionaceous (c. papilionacea, Cytisus, figs. 253, 254), when composed of five petals, of which the upper or standard 252. Strawberry. Flower. 253. Cytisus. Flower in profile. 254. Cytisns. Front view of flower. 256. Cytisus. Left wing. 257. Cytisus. Petals forming the keel. (vexillum, fig. 255) is placed next to the axis$ and encloses the four others in bud ; of these the two lateral wings (alee, fig. 256) cover the two lower, which are contiguous, and often adhere by their lower margins, and together form the keel (carina, fig. 257). Other irregular corollas are called anomalous (c. anomala, Aconite, Pelargonium, Heartsease, fig. 170). Monopetalous Corollas. — In these, the tube consists of the united portions of the petals, the Limb is the upper or free portion, the throat (faux] is the top of the tube, and is usually reduced to a circular opening, but is sometimes lengthened or dilated (Comfrey, fig. 268). It must be borne in mind that the term limb, as 259. Heliotrope. Flower with naked throat (mag.). 260. Heliotrope. Corolla laid open (mag.). 261. Pulmonaria. Corolla laid open (mag.). 262. Lycopsis. Flower with bent tube and closed throat (mag.). 263. Myosotis. Flower with closed throat (mag.). applied to the corolla, has two meanings ; being used both to designate the blade of the leaf or petal, and the free upper portion above the tube of a gamopetalous corolla. The throat is appendiculate (f. ap~ T 1 i \ -I 9, 260 ; Bugloss, fig. 265 ; Comfrey, fig. 268) ; — toothed, when the segments are very short (Heath, fig. 276). The regular monopetalous corolla is tubular (c. tubulosd), when the tube is long and the limb erect and continuous with it (Cerinthe, fig. 271). The central flowers, called florets (flosculi), of Chrysanthemum (fig. 272) and allied plants with in- volucrate heads, have small tubular corollas. Such heads are called flosculose. They are infundibuliform (c. infundi- 7d. Heath, buliformis), when the tube insensibly widens upward- vcr' like a funnel (Bindweed, fig. 273) ; — hypocrateriform (c. hy- pocrateri-formis or -morplia), when the straight and long tube abruptly terminates in a flat spreading limb, like an antique patera (Lilac, Jessamine, Periwinkle, fig. 27.">. Canipimula. Flower. THE COEOLLA. 55 274; Bugloss, fig. 265); — campanulate (c. campanulata), when bell-shaped (Campanula, fig. 275) ; — urceolate (c. urceolata), when the tube is swollen in the middle, and the mouth contracted, like a small pitcher (Heath, fig. 276) ; 277. Pimpernel. Flower. 278. Lamium. Flower in profile. 281. Bosemary. Labiate corolla with upper lip upright. 279. Lamium. Front view of flower. 280. Galoobdolon. Front view of flower. —rotate (c. rotata), when the tube is suppressed, and the segments horizontal, and divergent like the spokes of a wheel (Pimpernel, fig. 277; Borage, fig. 267) ; — stellate (c. stellata), when rotate, with the seg.rn.ents very acute (Galium). The irregular monopetalous corolla is bilabiate (c. labiata, bilabiata), when the limb is cut into two principal superimposed divisions (lips), and the throat is open ; the upper lip consisting of two petals, and the lower of three. The upper lip may be entire, by the confluence of the two petals (Lamium, figs. -278, 279 ; Galeobdolon, fig. 280) ; or slightly split (Sage, Rosemary, fig. 281) ; or so deeply divided (Ger- mander, figs. 282, 283) that the two petals stand widely apart, and are confluent with the lower lip rather than with one another. In this case the corolla appears to consist of one five-lobed lower lip. Lastly, the upper lip is sometimes wholly suppressed, or distinguishable from the tube only by a notch (Bugle, fig. 284). The mid-lobe of the lower lip maybe entire (Rosemary, fig. 281); — bifid (Lamium, fig. 279; Bugle, fig. 284) ;—trifid (Galeobdolon, fig. 280). The personate corolla (c. personata) is a form of the labiate, with the throat closed by a projection of the lower lip, called the palate (palatum) ; in many personate corollas the tube is tumid at the 282. Germander. Back of flower. 283. Germander. Flower in profile. 284. Bngle. Labiate corolla with upper lip almost obsolete. 280. Snapdragon. Flower. base in the direction of the lower lip. and called gibbous (c. gibbosa, Snapdragon, fig. 285), or even spurred (c. calcarata, Linaria, fig. 286). Two-lipped corollas are often described as ringent (c. ringens}, but this term being equally applied to both the labiate and personate corollas, it is superfluous. 56 ORGANOGBAPHY AND GLOSSOLOGY. The ligulate corolla {c. ligulata) consists of five confluent petals, of which the two upper join at their base only, but unite almost throughout their length with the three others, as do these with each other, so that the corolla has a very short tube, and a limb en- tirely formed of a finely-toothed 291. Centrnnthns. Flower (liiug.)- 28 corolla. 280. Cornflower. Sterile floret (unng ). ligule (Chrysanthemum, fig. 287). Ligulate flowers are usually collected in an in- volucrate head, and are called semi-florets (semi-flosculi). A head (capitulum) composed of semi-florets is called scini-Jtosculose (Dandelion); one with tubular florets in the centre, and ligulate ones in the cir- cumference, is rayed (c. radiutum, Chrysanthemum, Marigold). All other irregular monopetalous corollas are considered to be anomalous (c. anomala). Of these the corolla of the Fox- glove (fig. 288) resembles a thimble ; the flowers on the cir- cumference of the Cornflower (fig. 289) are large, irregular, and lieuter . tuO8e of the Scabious (fig. 290) are also very irregular and almost labiate; and Centranthus (fig. 291) has an irregularly hypocrateriforin corolla, with an inferior spur to the tube. 200. scabious, floret. THE ANDRCECIUM. The andrcecium (androecium) is the simple or double whorl, placed within or above the corolla; the leaves composing it are called stamens (stamina). A complete stamen (fig. 292) consists of a petiole or filament (filamentum, F) and a limb or anther (anthera, A) ; the anther is halved vertically by a median nerve, the connective (connectivum, c) ; each half consists of a cell (loculus, L) formed of two valves, the junction of which is marked externally by a furrow or suture. The back of the anther faces the corolla, and its face is opposite the pistil. The cellular tissue of the anther-cells is originally soft, pulpy, and continuous ; but when the anther is mature, this tissue becomes dry and powdery ; the two valves then separate along the suture j the cell opens, and the parenchyma cells, THE ANDECECIUM. 57 now called pollen, are ready to be conveyed to the stigma. The anther is rarely sessile, i.e. without filament (Arum, fig. 293). When the corolla is monopetalous, the stamens almost invariably adhere to it 293. Arum. Stamen (mag.)» 292. Stock. Stamen. 294. Belladonna. Corolla and andrcecium laid open. 295. Campanula. Flower cut vertically. 296. Ranunculus. Pistil and stamens. (Belladonna, fig. 294) ; — amongst the few exceptions are Heaths and Campanulas (fig. 295). Insertion of the Stamens. — This term relates to the position on the floral axis which the stamens occupy relative to the other whorls. The insertion of the corolla always coinciding with that of the stamens, in the staminiferous monopetalous corolla the insertion of the stamens may be inferred from that of the corolla. Thus the stamens, like the corolla, are hypogynous (st. hypogyna], when they do not adhere to the pistil or calyx, but spring from the receptacle below the base of the pistil (Ranunculus, fig. 296; Primrose, fig. 297);— perigynous (st. peri- gyna), when inserted on the calyx, rather above the base of the pistil, to which they are relatively lateral (Apricot, fig. 298 ; Campanula, fig. 295) ; — epigynous (st. epigyna) when A ^K inserted on the pistil itself (Coriander, fig. 299 ; Madder, fig. 300). 297. Primrose. Flower cut vertically (mag.). 300. Madder. Flower cut vertically. 298. Apricot. Open flower. 299. Coriander. Flower cut vertically. The perigynous and epigynous insertions being easily confounded, the term calyciftoral (pi. calyciflorce] has been given to all plants whose corolla (whether mono- or poly-petalous) and stamens are inserted on the calyx, and this whether the calyx be below the ovary (Apricot, fig. 298), or above it (Campanula, fig. 295 ; Coriander, fig. 299; Madder, fig. 300). The term thalamiftoral (pi. thalamiflorce) has been given to plants whose polypetalous corolla and stamens are inserted below the pistil, or hypogynous ; and corollifloral to plants with a monopetalous stamiiiiferous corolla inserted below the pistil, or hypogynous (Primrose, fig. 297). 58 ORGANOGRAPHY AND GLOSSOLOGY. Number of the Stamens. - The flower is isostemonous (fl. isostemoneus), when the stamens equal the free or united petals in number (Coriander, fig. 299 ; Primrose, fig. 297) ;—anisostomonous (fl. a,nisostemoneus), when they are fewer than the petals (Valerian, fig. 301 ; Centranthu*, fig. 291 ; Snapdragon, fig. 305), or more numerous than the petals (Scdum, fig. 302 ; Horse-chestnut, fig. 303 ; Ranunculus, fig. 296) ;— diplostemonous (fl. diplostemoneus), when more than double the petals (Ranun- culus, fig. 296 ; Myrtle, fig. 304). The flower, according to the number of >, stamens, from one to ten, is said to be 301. ViiKrinn. Flower (mag.). 303. Honw-, licstnut. Flower. 304. Myrtle. Flowering branch. wow-, di-, tri-, tetr~, pent-, hex-, kept-, oct-, enne-, dec-androus ; when above ten, the stamens are called indefinite (st. plurima), and the flower polyandrous (fl. polyandries). Proportions of the Stamens. — Stamens are not always equal : they are didynamous (st. didynama, Snapdragon, fig. 305), when four, of which two are the longest; this occurs in irregular monopetalous normally pentandrous flowers, in which four stamens alternate with four of the five lobes of the corolla, and the fifth stamen is suppressed. Stamens are said to be tetradynamous (st. tetradynama) when six, of which two are small and opposite, and four large, and placed in opposite pairs (Wallflower, fig. 306) ; these pairs being in juxtaposition, their fila- f ^ 30.">. Snapdragon. Androecium and half of corolla. 30f>. Wallflower. A IK In roil mi. ::n7. Stellnrin. Andrcecium. 308. Mecoiu>i»i«. Flower cut vertically. ments sometimes cohere, so that each pair has been supposed to represent a double stamen. In polystemonous or diplostemonous flowers, the whorls of stamens are often unequal (Stellaria, fig. 307), but there is no special term for this modifi- cation. Cohesion of the Stamens. — Stamens &refree (st. distincta, libera), when completely THE ANDRCECIUM. 59 independent of each other (Meconopsis, fig. 308) ; — monadelphous (st. monadelpha), when the filaments are more or less united in a single tube (Oxalis, fig. 309 ; Mallow, 311. Cj'tisus. Andrrecinm and pistil. 30!). Oxalis. • 310. Mallow. Audroecium and pistil. Andrcecium (mag.). 312. Lotus. Andrcecium and pistil. 313. St. John's Wort. Flower cut vertically. fig. 310; Cytisus, fig. 311); — diadelphous (st. diadelpha), when united into two columns (Lotus, fig. 312) ; — triadelphus (st. triadelpha), when in three bundles (St. John's Wort, fig. 313) ; — polyadelphus (st. polyadelpha), when in several simple or branched bundles (Orange, fig. 314 ; Castor-oil, fig. 315) ; — syngenesious (st. syngenesa), when the anthers cohere (Thistle, fig. 316). Sometimes the co- hesion extends to the filaments also (Lobelia, Melon, fig. 317). The stamens are said to be gynandrous (st. gynandra), 315. Castor-oil. 6. Nigella. Kipe ovury cut transversely. 398. Lychnis. Young ovary (ninsr.) cut transversely. 897. Cyclamen. Pistil cut vertically. period is divided into superimposed cells by septa formed of the parenchyma of the ovary, which is intruded horizontally between the seeds. 8purious cells (loculi spurii) are cavities in the ovary which do not contain seeds. The young ovary of Nigella presents five cells, each containing two piles of ovules ; later (fig. 396) there appear ten cells, of which five in the centre of the fruit contain seeds attached to their interior angle ; the other five are exterior to these, and are empty, and due to the inflation of the epicarp (EP), which in swelling has dragged with it the mesocarp (M), whilst the endocarp (EN) has re- mained in its place. Central placentas are said to be free (p. centrales, liber paj), when they are not united by septa to the walls of the ovary, and appear com- pletely independent of the carpels ; this placentation is characteristic of Primulacece (Pimpernel, Primrose, Cyclamen, fig. 397). To explain this isolation of the placentas, it is assumed that the edges of the carpellary leaves join throughout their length, and constitute a one-celled ovary, but that their basal edges dilate, and ascend in the middle of the cell to form a central mass of placentas. The placentas of Primulacece are thus confined to the bases of the carpels. The reverse is the case in the one-celled ovary of Combretacece, where the ovules spring from the top of the cell. In most CaryophyllecB (Pink, Lychnis), the placentas appear to be free, but this arises from the early evanescence of the septa, which can only be well seen in the very young flower (fig. 398). Some German and French botanists regard the carpellary leaf as a protective organ merely ; denying that it has the power of producing buds, and limiting this power to the floral axis. According to these, the axis alone produces ovules, and the carpellary leaves protect them. In the case of many-celled ovaries, they regard the edges of the carpellary leaves as folded inwards till they reach and cohere with the axile placentas (which in no wise belong to them), the fibro-vascular bundles of the placentas losing themselves in the tissue of the styles, which are continuations of the midribs of the carpels. In unilocular compound ovaries they consider that the placentiferous axis branches like the spokes of a half-opened parasol, and that the branches run along the contiguous edges of the carpellary leaves (Heartsease, Mignon- ette, fig. 384; Orchis, fig. 385). This modification of the carpellary theory of placentation rests on the isola- tion of the placentas in Primulacea; (fig. 397) ; on the enormous disproportion of the placentas relatively to the carpellary leaves in various plants (Lychnis, fig. 398; Campanula, fig. 390) ; and on the arrangement of the nerves in certain ovaries (Pea, fig. 14 ; Columbine, fig. 13), wherein two systems of fibro-vascular bundles are distinctly visible ; the one coming from the median nerve, the others THE PISTIL. 69 rising from the placentas, and communicating with the first ; which seems to indicate a union between the axis and carpels. The flower is isogynous (fl. isogynus), when the carpels of which the pistil is composed equal the sepals in number (Sedum) ;—anisogynous (fl. anisogynus), when the carpels are fewer in number than the sepals (Saxifrage, Snapdragon, Comfrey) ; — polygynous (fl. polygynus), when the carpels are more numerous than the sepals (Ranunculus, Poppy). In pistils formed of consolidated carpels, the number of the latter is determined, either by the number of styles, when these are free, or by the number of septa, or by the number of placentas, which are usually in pairs, and form vertical series, or fleshy protuberances. In pistils with parietal ovules (Butomus, Poppy, Gentian) the number of stigmas or styles or septa must be examined. The two- or more ovuled ovary (whether simple or compound, free or adherent) is always called many-ovuled (ov. pluriovulatum). All ovaries are supposed to be normally many-ovuled, for each carpel having two placentas, and each placenta being normally one- or more ovuled, it follows that no ovary should have fewer than two ovules. A one-ovuled ovary (ov. uniovulatum) is hence regarded as resulting from the suppression of one or more ovules. The young ovary often contains two or more ovules, of which all but one are subsequently suppressed, as in the Peach (fig. 399), which is always two-ovuled when young; and in the Horse-chestnut and Oak, which have six ovules (fig. 400). The compound ovary is usually globose or ovoid; it is lobed (ov. lolmtum], when the dorsal faces of the carpels are very convex, and separated by deep furrows (usually indicating the lines of junction, fig. 225), and according to the number, it is bilobed, trilobed, &c. The carpels are not always whorled; but are sometimes arranged in a spiral, when they form a head or spike ; the receptacle at the same time lengthening into a hemispheric, conical, or cylindric axis (Strawberry, fig. 401 ; Raspberry, fig. 402 ; Ficaria, fig. 403 ; Adonis, fig. 404). Roses (fig. 405) present a precisely reverse arrangement; the carpels (ov), instead of rising 390. Peach. Young ovary (mag.) cut transversely. 400. Oak. Young ovary (mag.) cut transversely. 401. Strawberry. Flower cut vertically. 403. Ficaria. 402. Easpberry. Carpels arranged Ripe pistil, cut vertically. in a head. 401. Adonis. Pistil (mag.). 405. Rose. Flower cut vertically. from a plane or convex surface, spring from the walls of a cavity (c) ; which will be described under the torus. In this (exceptional) case, the carpels are said to be parieta I (ov. parietalia) . 70 ORGANOGRAPHY AND GLOSSOLOGY. The compound style is improperly said to be simple (st. simplex), when wholly undivided ; it is bi- tri-jid, &c., when the component styles cohere beyond the middle ; bi- partite, &c., when they do not cohere to the middle. The styles of each carpel rarely bifurcate once or. twice ; when they do, they are double or quadruple in number to the carpels (Euphorbia, fig. 406). The style is terminal (st. terminalis), when it springs from the top of the ovary (Apricot, fig. 411) ; — lateral, when it springs more or less from the side of the carpel, the top of which appears bent downwards (Straw- berry, fig. 407) ; — basilar (st. basilaris), when the top of the ovary is 408. Alchomllla. Carpel (mag.)' 40C. Euphorbia. Pistil. 407. Struwberry. Carpel (mug.). 40!). Comfrey. PUtil and calyx cut vertically. 410. Sage. Lower portion of flower, cut vertically. bent down to a level with its base (Alchemilla, fig. 408). When there are many ovaries, with confluent basilar styles, the style is said to be gynobasic (st. gynobasicus, Comfrey, fig. 409), and the dilated base of this composite style, extending below the ovaries and surface of the re- ceptacle, has been called a gynobase 3. ..ov n..-- 411. Apricot. Pistil cut vertically. G TC C 412. Lychnis. Young Ovary (mag.) cnt trans- versely. Kp, epicarp ; End, eudo- carp ; I-L, placenta ; u, ovule ; TC, conducting tias-ue ; c, septum. C 413. Snapdragon* Vertical section of sty leduring fertilization, showing two pollen-grains on the stigma, and the pollen-tubes pene- trating between the cells of the style (mag.)- M 414. Dandelion. Young pistil (mag.), open to show the two cords, c.p, of the conduct- ing tissue, of which one is broken. Car, ovary ; L.c, calyx ; D.e, epigynous disk ; it, raphe ; Ch, chaloza ; M, micropyle. (yynobasis). The gynobase is sometimes prolonged into a gynophore (Sage, fig. 410, o) ; but a gynophore proper must not be confounded with the gynobase ; the gynobase belongs to the styles, that is, to the carpels ; the gynophore proper belongs to the axis itself, of which it is the termination.1 The style is a portion of the carpellary leaf, contracted into a sort of longi- tudinal tube, filled with a moist and loose parenchyma, named conducting tissue Except under the view that the placenta are productions of the axis.— ED. THE PISTIL. 71 (fig. 411, T) ; it is this tissue, which, spreading over the top or sides of the style, forms the spongy surface called the stigma (s). The same tissue descends from the style into the cavity of the ovary (fig. 412, TO), passes along the placentas (PL), and covers with its loose cells the rnicropyle of each ovule (G) ; and it is between these cells (fig. 413) that the pollen-tube, leaving the pollen-grain on the stigma, effects a passage to and fertilizes the ovule. In Composites, the conducting tissue consists of two threads (fig. 414, C.p, C.p), which descend from the base of the style upon the sides of the ovule, without adhering to it ; at its base they join and enter the base of the funicle, near the micropyle. In Statice (fig. 415), according to Mirbel, the conducting tissue (tis. c) resembles a pestle ; it enters the cavity of the ovary, im- mediately above the gaping micropyle of the ovule (ov.), which is suspended from a basal cord (cor.). This conducting tissue rests on the micropyle like the stopper of a decanter, and is visible after fertilization (fig. 416). tis.c 415. Statice. Ovary cut vertically, showing the ovule before fertilization (mag.). 416. Statice. Fertilized ovule (mag.). 422. Parietaria. Pistil (mag.). 418. Tobacco. Pistil. 419. Wallflower. Pistil (mag.). The stigma (figs. 413 and 411 s) is nothing but the conducting tissue spread out; the sfigmatic surface has no epidermis, and is usually spongy, damp, and papillose, and thus suited to retain the pollen. The stigma (whether simple or compound) is complete (st. com- pletum) when it is continuous with the style, and clearly distin- guishable. The complete stigma may be globular (Daphne, fig. 417), hemispheric (Primrose, fig. 376), round (Tobacco, fig. 418), forked (Wallflower, fig. 419), bi-lamellate (Datura), lobed (Lily, fig. 375; Melon, fig. 420), laciniate or fringed (Saffron, Rumex, fig. 421), penicillate (Parietaria, fig. 422), plumose (Wheat, fig. 423), discoid, conical, cylindric, club-shaped, awl-shaped, &c. It is superficial (st. super- ficiale) when confined to the surface of a part of the style or ovary, and only 425. Ranunculus. Carpel (mag.). 423. Wheat. Flower (mag.). 72 OKGANOGRAPHY AND GLOSSOLOGY. distinguishable by its papillae. The superficial stigma is terminal in Fra&inella (fig. 362), Strawberry (fig. 407), Sweet Vetch (fig. 424) ; lateral in Ranunculus, where it is hooked (fig. 425) ; and in Hearts- ease (fig. 377), where it forms a hollow ball with a two-lipped 429. Lychnis. Pistil. Sc.'_ 427. Iris. Pistil. 428. Orchis. Flower without the ovary. NT, stigma ; it, rctinnciilnm ; r, pollen ; i., anther-cell (mag.). 430. Cornflower. Style and stigmas (mag.). orifice; and in Polygala (fig. 426), where it forms a small very short lip (Sti.) on the sides of a style (Sty.) hollowed into a funnel, and spoon-shaped at the end ;— in Iris (fig. 427), in which the composite style divides into three petaloid plates with two unequal lips, the interior of which is bifurcate, the stigmatic surface (Stig.) occu- pies a small transverse fissure between these lips; — in Orchis (fig. 428), where it forms a shining and viscous cup (ST) situated below the retinaculum (R) ; — in Lychnis (fig. 429) where it is papillose and transparent, clothing 431. Chrysanthemum. Pistil (mag.). 432. Eiipatorium. Pistil (mag.). 435. Achillea. Style of a floret (mag.). 430. Achillea. Style of a semi-floret (mag.). the furrowed inner faces of the styles ; — in Plantain, where its papillae form two velvety lines along the style. The stigma must not be confounded with certain peculiar hairs which some- times garnish the style, and are almost always directed obliquely upwards, and intended to catch the pollen ; they are most frequent in flowers with contiguous THE PISTIL. 73 introrse anthers. In these plants the young style is much shorter than the stamens ; it grows rapidly as the flower expands, and traverses the tube formed by the stamens, where its hairs, rubbing the anther-cells, open them, and sweep out the pollen which adheres to them; they are hence called collecting hairs or brushes (pili col- lectores). In the Cornflower (fig. 430) the stigmas (Sti.) are lateral and superficial, as in the Lychnis, and below them is a small swelling clothed with a tuft of very small collecting hairs (pc). In the Chrysanthemum (fig. 431), the two style-branches are papillose on their inner faces, and tipped by a little tuft of collecting hairs. In Eupatorium (fig. 432) the two style-branches are cylindric and bristle with collecting hairs ; and the stigmatic surfaces form a little band which- extends from the fork half-way up the branches. In Achillea (figs. 433, 434), the heads of which are rayed, the central florets are tubular and hermaphrodite (fig. 433), and the circumferential are female semi-florets (fig. 434). Here the style-arms of the central florets (hermaphrodite) are papillose on the inner face, and tipped with a brush of collecting hairs; the semi- florets again, being female only, their style-arms (fig. 436) have no collecting hairs (fig. 435), but, as the pollen of the centre florets may reach them, their style-arms are papillose, so as to retain the pollen and secure fertilization. In Campanula the five style-branches (fig. 437) are papillose on the inner face, and subtended by five rows of collecting hairs, each row being double, and answering to the two halves of each anther. Before expansion, the style grows rapidly, the anthers open, and their pollen- grains, which bristle with hooks, adhere firmly to the hairs which have sweP^ them; this accomplished, the collecting 437. Campanula. Pistil. 439. Vine. Androecium and pistil (mag.). 438. Arum. Pistil (rnag.). 440. Elder. Pistil and calyx (mag.). hairs are retracted within themselves, like the horns of a snail ; the pollen then disappears, and the style becomes clean, its surface being merely a little rough. The stigma is sessile (st. sessile) when, there being no style, it is seated directly on the ovary. In the Tulip (fig. 345) it forms three bi-lobed crests ; — in the Nettle, a pencil ; — in Arum (fig. 438), a little papillose tuft; — in the Vine (fig. 439), a flat- tened head; — in the Elder (fig. 440), three rounded lobes; in the Poppy (fig. 441), velvety radiating double crests, clothing the depressed styles, which together resemble a shield or cap with scalloped edges. The stigma is sometimes absent, and then the ovary remains open ; this is the case with Pine (fig. 379), Cypress, and Thuja, the female flowers of which are arranged in a spike ; each is furnished with an outer bract, which soon withers and disap- pears ; each is formed of a. scale representing an open carpel, without style or stigma? 74 ORGANOGKAPHY AND GLOSSOLOGY. bearing at its base two ovules with a gaping micropyle ; after fertilization, these carpels thicken, harden, and become appressed, and form closed cavities which protect the seeds during their ripening. TORUS, DISK, NECTARIES. The torus is the part of the receptacle situated between the calyx and the pistil 011 which the corolla and androecium are inserted. It is merely the periphery of the receptacle, and not a special organ ; but for convenience of description it is so considered. The torus produces, besides stamens and petals, nectariferous glands and sundry 442. Columbine. Piutil surrounded by scales. Torus showing the scars left by the stamens (mag.). 443. Tree Peony. Flower without the corolla and most of the 8tameua. 444. White Water-Lily. Pistil and cup bearing the petals and stamen*. 445. Orange. Vertical section of pistil and receptacle. T, tnnis ; c, calyx. expansions analogous to petals or stamens. Thus, in the Columbine (fig. 442), between the andro3cium and the pistil, are ten membranous silvery white scales, with folded edges, larger at the base than at the top, which may be considered as filaments, and which sometimes bear an anther at their extremity. In the Tree Peony (fig. 443), the thick swollen torus elongates into a membranous cup surrounding the carpels, without adhering to them, and open at the top to afford a passage to the stigmas : it appears to form a part of the fruit, from which it is nevertheless very distinct. This petaloid involucre sometimes bears anthers. In the White Water Lily (fig. 444) the stamens and petals cohere with the torus, which envelops the ovary, so that they appear to adhere to the ovary; they die after flowering, leaving the torus marked with their scars. In the Yellow Water Lily, the thick cup, externally green and flaccid, which some botanists have considered as a torus envelop- ing the ovary, is nothing but the epicarp of the ovary; at maturity it bursts irregularly, and comes away, leaving the seeds retained by the endocarp, when they fall to the bottom of the water and germinate. The torus often forms, below the ovary, a projecting ring or swelling, from which spring the stamens and petals (Orange, fig. 445 T ; Mignonette, fig. 446); but more often this ring, reduced to its most simple form, only appears as a circular line 44C. Mignonette. Flower without corolla (mag.). TORUS, DISK, NECTARIES. 75 448. Apple. Young fruit cut transversely. 447. Chelidonium. Pistil (mag.). 449. Apple. Fruit cut vertically. on the receptacle, between the pistil and the calyx (Clielidoniwn,fig. 447). In every case the andrcecium and corolla, being inserted on this ring and below the pistil, are hypogynous, and the plant thalamifloral if the c petals are free, corollifloral if they are coherent. In many plants the receptacle dilates into a cup, which represents a calycinal tube, over which the torus is spread, and the stamens and pistils spring from its outer margin (Strawberry, fig. 401 ; Apricot, fig. 449). In others it rises upon the carpels, envelops them closely, and forms with them but one body, upon the circumference of which the stamens, petals and calyx are inserted at a higher level than the ovary (Myrtle, fig. 381 ; Saxifrage, fig. 382). This cup, enveloping the carpels and formed by the growth of the receptacle, is the calyx-tube of modern Floras, which it would be better to call a receptacular tube or cup. This hypertrophy of the receptacle is particularly striking in orchard fruits. If we halve an unripe pear or apple (fig. 448), we find five carpels, forming five two- ovuled cells, surrounded by a fleshy mass, the so-called caly cine-tube (better called receptacular cup], which has closely enveloped them, and agglutinated them by their lateral faces, but left their inner edges free. A vertical section of a ripe apple (fig. 449) exhibits a fibro -vascular bundle, extending from the peduncle, with which it is continuous, to the carpels (E) ; it is the parenchyma of the receptacle, which has here enormously increased in bulk to envelop the ovaries (T) ; at the summit of this mass, that is to say, at the top of the fruit, the remains of the sepals and stamens may be seen carried up by the expansion of the receptacle. The receptacular theory of the calycine-tube completely explains the arrange- ment of the carpels of a Rose (fig. 405) . In this, the position of the carpels on the internal wall of a calycine-tube was difficult to admit ; the whorls of the flower being lateral expansions of the axis, it was impossible, in defiance of the law of the evolution of floral whorls, to attribute to the calyx the power of producing carpels. The position of the coloured ring from which the petals and stamens rise is the key to the apparently abnormal position of the carpels ; this ring surmounts the ovoid body enclosing the carpels ; the torus has therefore reached that point before emit- ting laterally the petals and stamens; and since the torus is nothing but the circumference of the receptacle, it is evident that it must be the latter organ which constitutes the hollow body enclosing the carpels. In fact, the receptacle, instead of forming, as in the Strawberry (fig. 401), a hemisphere, has swollen, risen much above its ordinary level, and formed a sort of cup ; thus resembling the finger of a glove turned inside out, the normally outer or convex surface becoming the^inner, or concave, one. Were the convex receptacle of the Strawberry reduced to a thin 7G ORGANOGEAPHY AND GLOSSOLOGY. membrane, and turned inside out, the sepals would then form a ring round the mouth of a sort of bottle, represented by the inverted receptacle, whose throat would be occupied by the stamens and petals, and its inner surface by the ovaries ; and the strawberry would be thus changed into a rose. The last evidence of the hollow body of the rose being a cup-shaped expansion of the axis rests on the cases in which the receptacle forms, instead of a cup, a central convex projection, which bears carpels ; the rose thus being converted into a strawberry. In all these cases the plant is calvcifloral ; the stamens and petals are not hypogynous, as in the Lychnis (fig. 380) and Primrose (fig. 297), but are inserted above the base of the pistil, at the distal end of the torus (Sumach, fig. 450), or on the outer circumference of a ring or cup formed by the torus (Circcna, fig. 450 bis ; AlchemilJa, fig. 451); they are thus either perigynous or epigynous, accord- 461. Alchemilla. Flower cut vertically (mag.). 45O. Sumach. Flower cut vertically (mag.). 432. Nnatnrtlinn. Flower cut vertically. ing to their insertion around (fig. 450) or above the ovary (fig. 450 bis). When the torus both spreads over the base of the calyx and around that of the ovary, the androecium may be hypogynous, and the corolla peri- yynous ; this is very rare, but occurs in Tropatolum (fig. 452). The term disk has been reserved for the tumid ring which, in hypogynous flowers, surrounds the base 4.V» Inn Circwa. 453. Radish. Flower cnt Pistil vertically. and nectaries. 4S5. Sedum. Pistil and nectaries (mag.). 457. P.M in.--iii. Petal and nectaries. 456. Fritjllary. Stamen, petal and nectary. 454. Periwinkle. Pistil and nectai ies. of the ovary (Orange, fig. 445) ; and for the thickening which crowns the inferior ovary, enclosing the. base of the style (Circcea, fig. 450 bis). These thickenings of AEEANGEMENT OF APPENDICULAE OEGANS. 77 the torus are glandular, and usually secrete honeyed fluids, whence they have been classed with nectaries, of which we are about to speak. Nectaries or nectariferous glands are usually developed from the torus, and placed upon it or the organs developed from it. The receptacle of the Radish (fig. 458), Wall/lower (fig. 10), and other Cruciferce, bears four or six glands ; — the Periwinkle (fig. 454) two ; — Sedum (fig. 455) five ; — most Gesneriacece also five ; but in this Order all intermediates between five free glands and a large hypogynous or epigynous disk are to be found. In the Straw- berry (fig. 401), Peach (fig. 368), and other Rosacece, the orange-yellow layer of the torus, which is spread over the calyx, secretes superficially a honeyed liquor ; but often for so short a time that it is difficult to observe it. In Ranunculus (fig. 237) a small nectary occurs, protected by a scale, at the base of the claw of each petal. In Berberis (fig. 238), each petal bears, a little above the base, two naked ovoid necta- ries. In the Fritillary (fig. 456), the six petaloid perianth-segments each bear a nectary a little above the base, which, instead of projecting, forms a furrow. In the Lily, a double nectariferous furrow extends along the face of the midrib of each petal. In Parnassia (fig. 457), opposite each petal there is a petaloid scale which ramifies into three, five, seven, nine, or fifteen branches, each tipped by a globular nectary. Nectaries are sometimes on the tip or base of the connective of the stamens, as in Adenanthera, Prosopis, &c. In Heartsease (fig. 458), two nectaries pro- ceed from two of the stamens, and, projecting from the connective at the base of the anther, form two recurved tails, sheathed in the hollow horn of the lower petal, at the base of which they secrete a sweet liquor from their tips. It has already been remarked that hollow petals contain a nectary in their cavity (Columbine, fig. 246 ; Aconite, fig. 247 ; Nigella, fig. 244; Helle- 458< bore, fig. 243; Winter Aconite, fig. 244 bis). and a»droeci"m- In monopetalous corollas the nectaries maybe superficial (Honeysuckle, Lilac), or occupy a cavity which externally forms a boss or spur (Linaria, fig. 286 ; Snap- dragon, fig. 285; Centranthus, fig. 291); in the latter case the corolla is irregular, and the stamens are often imperfect ; but it is difficult to say whether the necta- ries are the cause or effect of this irregularity. Nectaries are not confined to the torus ; they are found on the external surface of the calyx in Malpighiacece,; and a glandular secreting layer occurs in the thick- ness of the septa of the ovary of Liliacece, named by Brongniart { glandes septales.' In unisexual flowers, it often happens that the absent organs are replaced by necta- ries (Melon, and many other diclinous plants). ARRANGEMENT OF APPENDICULAR ORGANS AROUND THE AXIS. Appendages or appendicular organs are lateral developments from the vegetable axis : — the leaves, bracts, sepals, petals, stamens, and carpels. It has been stated (Infrod. p. 2), that leaves are either opposite, whorled, or 78 OEGANOGRAPHY AND GLOSSOLOGY. alternate ; as also (p. 42) that the floral organs (calyx, corolla, androeciuna and pistil) are normally whorled; but we have warned the reader that very frequently the leaves of each series, instead of forming a true whorl, are arranged in successive flattened spirals, though still retaining the name of whorls. We will now advert somewhat in detail: 1. To the arrangement of leaves properly so called, c,arpellary leaves, and bracts (this branch of Botany is called Phyllotaxy) ; 2. To the arrangement of the petals and sepals, an arrangement termed Vernation, because it can only be satisfactorily studied before the flower expands. PHYLLOTAXY. When leaves are clearly whorled, either in twos (opposite), threes, fours, fives, &c., they are generally separated by equal intervals, and consequently the arc com- prehended between the bases of two contiguous leaves is equal to the circumference of the stem, divided by the number of leaves in the whorl. This arc will therefore embrace half the circumference if the whorl consists of two leaves ; one-third of the circumference if it consists of three ; one-fourth, one-fifth, one-sixth, if it consists of four, five, or six leaves. It has also been observed that the leaves of a whorl are not placed directly above those of the whorl immediately above or below them, but opposite the intervals which separate the leaves, and either exactly opposite, or to one or the other side of the interval. When the leaves are opposite, and each pair crosses the upper and lower pair at right angles, the leaves occupy four rectilinear lines, and, seen from above, form a cross; such leaves are decussate (f. decussata). Whorls of three or four leaves will in like manner occupy six or eight longitudinal lines. Whorled leaves are relatively few ; many more plants have opposite leaves, and by far the largest number have alternate leaves; and it is by the latter that the arrangement of leaves on the stem must especially be studied. We have seen (p. 3) that the Oak presents five leaves (I, 2, 3, 4, 5), spirally arranged around the stem, so that the one (6) which succeeds the fifth is placed vertically above the first. In a longer branch, the seventh would be placed above the second, the eighth above the third, &c. This spiral arrangement prevails in many woody and herbaceous plants, as the Peach, Plum, Cherry, Rose, Raspberry, Hawthorn, Spircea, Cytisus, Poplar, Willow, Sumach, Wallflower, Mignon- ette, Heartsease, Groundsel, Poppy, &c. The naturalist Ch. Bonnet, who was the first to observe this arrangement of alternate leaves, remarked that their points of insertion were separated from each other by equal intervals, and discovered some more complicated arrangements, as that, instead of the sixth leaf, it is often the ninth or even the fourteenth which is placed vertically above the first, indicating a series of eight or of thirteen leaves. Modern botanists have followed up this subject, and have formulated as laws the facts which Ch. Bonnet had not generalized. To begin with the simplest example of alternation of leaves, that in which the leaves alternate on opposite sides of the stem (Lime, Ivy, Elm, Hazel, &c.) : if a PHYLLOTAXY. 79 thread be carried round the stem so as to touch the insertions of these leaves, it will describe a regular spiral. If one of these leaves be taken as a starting point, and if they be counted from below upwards, it will be perceived that 3 is above 1, 4 above 2, &c. ; and all are arranged on two equidistant vertical lines, being separated by half the circumference of the stem. Leaves thus placed are called distichous (fig. 69). If three leaves complete one turn of the spiral, the fourth will be vertically above the first, the fifth above the second, &c., and all will be arranged on three equidistant vertical lines, and separated from each other by a third of the circum- ference of the stem. Such leaves are termed tristichous (Galingale, Garex, and many monocotyledons) . In the OaJc, Poplar, Plum, &c., where the leaves are arranged in fives, and occupy five vertical equidistant lines on a branch, these lines divide the circum- ference of the branch into five equal portions, and are separated by an arc equal to one-fifth of the circumference of the stem. But here it is important to remark, that if, taking one of these leaves as the starting-point, we examine the successive leaves of the spiral, the leaf which follows or precedes number one is not situated on the nearest vertical to that to which number one belongs, but on that which comes after number two,, and that this vertical is at two-fifths the circumference from the first. Here the spiral is not completed in one turn by two or three leaves, as in the two preceding cases ; for the intervals between the five leaves are such that, before arriving at the sixth, which is immediately above the first, the spiral passing through their points of insertion would make two complete turns round the stem ; the distance between the leaves will therefore be two-fifths of the circumference. This arrangement is called the quincunx. The name cycle is given to a system of leaves in which, after one or more turns of the spiral, a leaf is found immediately above the one from which we started, and beginning a new series. To obtain a complete idea of the cycle, we must therefore consider, besides the number of leaves which compose it, the number of spiral turns they occupy. The angle of divergence of two consecutive leaves is measured by the arc between them. Thus the fraction £ expresses the angle of divergence of tri- stichous leaves, and the fraction f- the angle of divergence of quincunx leaves. As to distichous leaves, the term angle cannot apply to their divergence, being half a circumference, but it is expressed by the fraction \. These fractions have for their numerator the number of the spiral turns of which the cycle is composed, and for denominator the number of leaves in the cycle, or, to speak more exactly, the number of spaces separating the points of insertion of these leaves. A cycle may therefore be designated by the fraction expressing the angle of divergence, since the denominator of this fraction indicates the number of leaves, and its numerator the number of turns. Besides the three .cycles mentioned above, designated by the fractions ^, ^, f-, we find cycles of eight leaves in three turns, i.e. f ; thirteen leaves in five turns, T5^ ; twenty-one leaves in eight turns, ¥8T; thirty-four leaves in thirteen turns, -|2 ; 80 OEGANOGRAPHY AND GLOSSOLOGY. fifty-five leaves in twenty-one turns, f£ ; eighty-nine leaves in thirty-four turns, -g-J ; one hundred and forty-four leaves in fifty-five turns, -ffa, &c. Now, if we arrange this series of fractions progressively, , f , i, T3a> A. &c., several curious analogies will appear, of which the most striking is, that each frac- tion has for its numerator the sum of the numerators of the two preceding fractions, and for denominator the sum of the two preceding denominators. In like manner any one of these fractions may be obtained by taking the two fractions which imme- diately follow it, and finding the quotient of their numerators and denominators. It is easy to obtain these fractions when the leaves are neither too distant nor too crowded on the stem, as often happens. The spiral which takes in all the leaves is called a primitive spiral. But if the intercedes are long, the leaves consequently remote, and the cycle composed of a considerable number of leaves, it becomes diffi- cult to ascertain by inspection which leaf is vertical to the first, and hence to esti- mate the angle of divergence be- tween two con- secutive leaves. This becomes still more difficult when the leaves are crowded, as in the rosettes of the Hoiweleek, in Plan- tains and other so-called stemless plants, in the bracts of heads (Artichoke) ; or in the scales or open carpels which com- pose the cones of Pines, Firs, Larches, &c. In the case of crowded leaves, we can, however, by a very simple calculation, ascer- tain the angle of divergence, and thus determine the primitive spiral. Take, for example, a stem bearing a series of cycles of eight 4.')9a. Primitive spiral from right to left, and bearing three cycles, each of eight leaves, shown liy tin- numbered point', and inserted on three turns of the spiral. The secondary spirilla, formed to th« riijht by the numbers in fives, are indicated by the finely dotted lines ; the secondary .-pinil-, furnu d to the left by the numbers in threes, are indicated by the lines -----. PHYLLOTAXY. 81 leaves moderately separated on three turns of the spiral ; the cycle will be easily recognized, and the expression of the angle of divergence will be f . This arrange- ment obtains in many succulent plants, and especially in Sedum Telephium. Suppose the stem to be shortened, so that the leaves become crowded into a rosette, it follows that the spiral will become a very close one, comparable to a watch-spring of which the coils contract in approaching the axis (fig. 459 c). Let us suppose, further, that the inner end of this spring represents the top of the spiral, and its outer extremity the base ; it is obvious that on this depressed spiral the leaves nearest the centre would have been the nearest to the top of the more open spiral, and those nearest the circumference would have been the lowest. Now, knowing the angle of divergence of the leaves of Sedum in a normal state, it remains to find it for the same leaves gathered into a rosette ; for this it suffices to represent or plan three or four cycles, of three leaves each, according to the fraction f , that is, each cycle to contain eight leaves, that shall occupy three turns of a right- to- left spiral, and be separated by an arc equal to f of the circumference (fig. 459 a). A circle must then be drawn around this spiral, of which the radius shall join the two extremities of the spiral ; it is by means of this circle that we must be guided in laying down the angular divergence of the leaves, which being f , it follows that the circle must be divided into eight equal portions by as many radii, when three of these portions will represent f of the circumference, or in other words the angle of divergence. This done, we place a number (1) on the position of the first leaf, which is where the spiral touches the circumference ; then follow the coils of the spiral, and after clearing the three first arcs (f of the circumference) indicate the position of the next leaf (2), which will be at the intersection of the spiral and radius which bounds the third arc ; and so on, a leaf position being marked at the intersection of every third radius with the spiral ; till the centre of the spiral being reached, the plan will represent the entire series of leaves, numbered in order. Let us now examine the relative positions of the leaves, as indicated by their numbers. If we examine the radius bearing leaf No. 1, we shall see' above it on the same radius, Nos. 9 and 17, the difference between which is eight, and it is obvious that this "horizontal radius would represent a vertical line on the Sedum stem, along which the leaves 1, 9, and 17 are inserted, each marking the commencement of a cycle ; as also that these leaves are separated by three turns of the spiral. Com- mencing at any other radius (say Nos. 2, 10, 18, &c.), the result is the same, the fraction f being clearly expressed. There are other relations between these leaves, which this plan clearly demon- strates. Thus, between Nos. 1 and 4, situated on the next radius to the left, there is a difference of three ; the same between 4 and 7, &c. ; and starting from leaf No. 2 or 3, we shall find the same numerical relations as in the first instance ; the number expressing the difference (3) being the same as that of the series. If we now draw a line through the positions of all the leaves of each series, we shall see that each line is a portion of a spiral, and that these three partial spirals take the a 82 OKGANOGRAPHY AND GLOSSOLOGY. same direction, and include within their course the points of insertion of all the leaves. If, on the other hand, starting from No. 1, we examine its relations with No. 6, on the radius next to the right, we find between them a difference of five ; and similarly with 6 and 11, 11 and 16, &c. ; and between Nos. 2 and 7, and Nos. 12, 17 and 22, and along the series commencing with 4 and 5. Here again, from left to right, the number expressing the difference corresponds to that of the series. Each of these series may be shown more clearly by means of a curved line uniting all the leaves which compose it, and we shall then have five segments of a spiral turning symmetrically from left to right, and passing through the insertions of all the leaves. These segments of the spiral have been termed secondary spirals, to distinguish them from the primitive spiral, also termed generating spiral. Now it will be remarked that the secondary spirals proceeding from right to left are three 459 6. Rosette forming two cycles of eight leaves, of which the angle of divergence U J. 4.W <•. Rosette forming a cycle of thirteen leaves, of which the angle of divergence is /, ; the axis A, where they are In.-ci U*l, tn-uni live turns of the spiral, show- ing the point of insertion of each leaf. in number, which number is the numerator of the fraction § ; and that the sum of these three, and of the five going from left to right, is eight, or the denominator of the fraction. If therefore it is possible to count the secondary spirals to left and right, of rosettes, involucral bracts, or scales of Pine cones, in all of which the primitive spiral is obscured by the closeness of the parts, we may assume that the smaller number represents the numerator, and the sum of the two numbers the denominator of the desired fraction ; which again gives the angle of divergence, the number of leaves in the cycle, and the number of turns of the spiral which they occupy. This crowding of the leaves, which we have illustrated by Sedum, is frequent amongst plants with radical leaves, in many of which the cycle of the leaves is indicated by the fraction $ (Common Plantain, fig. 459 6). The number of secondary spirals to right and left being known, it is easy to number each leaf in the primitive spiral. Take, for example, the rosette (fig. 459 c), which represents a Houseleek, or the cone of the Maritime Pine (6g. 459 d). Their PHYLLOTAXY. 83 angle of divergence is T5j, which is easily found by counting the very obvious secondary spirals to right and left. We have only alluded to the most obvious secondary spirals ; but it will readily be understood that there are many others, some more, some less oblique than these, and that every numerical series having the same relative differences between them would be a spiral. The secondary spirals are especially visible in Pine cones, the axis of which is much longer than that of the Houseleek, and in which they form very distinctly marked parallel series.1 Begin by numbering as 1 one of the outer leaves of the rosette, or of the lower scales of the cone, and regard it as the first of a secondary spiral turning from left to right. To find No. 2 on it, re- member that the numbers of a secondary spiral must be separated by a space equal to the number of the secondary spirals of which this forms a part ; and as there are five parallel left-to-right spirals, the second leaf or scale must be numbered 6, the third 11, and so on to the top of the cone, or centre of the rosette. Having thus numbered all the scales or leaves of one of the five parallel secondary left- to-right spirals, these numbers may serve as start- ing-points from which to number all the other scales or leaves of the cone or rosette. We know that each of the numbered scales or leaves of the secondary left-to-right spiral equally forms one in the series of the right- to-left spirals, and we may number all the leaves or scales from any starting-point, by adding 5 when turning to the right, and 8 when turning to the left. Let us take, for example, No. 32 ; this number in the left-to-right spiral would (adding 5) lead us to No. 37, 37 leads to 42, and so on; but since No. 32 also enters into one of the eight secondary right- to-left spirals, the leaf or scale succeed- ing it in this spiral should be numbered 32 + 8, i.e. 40 ; and following this spiral, by .additions of 8, we should have 40, 48, 56, 64, 72, &c. To obtain in the same spiral the numbers below 32, we must deduct the number 8, which we had before added, and we shall have successively 32, 24, 16, 8. If, in starting from the same No. 32, we descend the secondary spiral which turns from left to right, we must take 5 from 32, when we shall have successively 27, 22, 17, 12, 7, 2, &c. All the leaves or scales of the rosette or cone being numbered, their succession 1 Nothing is easier than to observe this, by numbering the scales of a ripe cone of the Maritime Pine. 02 459 d. Cone of Maritime Pine, with the scales numbered according to their relative heights. The most obvious secondary spirals are formed to the right by the series of numbers in fives ; to the left by the series of numbers in eights. 84 OEGANOGRAPHY ANI> GLOSSOLOGY. indicates the generating spiral. But the direction of this generating spiral from left to right, or right to left, depends on the angle of divergence ; if the fraction be f , or T3y, or -1-3-, and so on, the primitive or generating spiral will follow the most nume- rous secondary spirals ; but if the fraction be -J, or /T, or ££, &c., the generating spiral will follow the least numerous secondary spirals. Take, for example, the fraction £ (fig. 459 a), and let us examine ihe relation be- tween the genera- ting and secondary spirals. Whatever may be the direc- tion of the genera- ting spiral, the least numerous secondary spirals must follow the same, and vice versa. Suppose the spiral to be aright- to-left one, as in 459 a, it follows that, placing No. 1 where the radius touches the outer end of the spiral, and successively numbering the leaves from £ to £, the nearest radius to the left will be occupied by a leaf before the nearest 469 t. Primitive spiral from right to left, bearing fire cycles, each of |£MMte««.ta«MM** ra(JiUS to the riqht. the numbered points, and inserted on five turns of the spiral. The secondary spiral*, formed M right by the numbers in fives, are indicated by the finely dotted lines ; the iecondary spirals, rpj first leaf On formed to the left by the numbers in eights, are indicated by the lines • the left radius will evidently be No. 4 ; for it will occur after traversing three £ (£) ; that is, after one entire revolution, plus £, and consequently on the left-hand radius nearest the one from which we started. The leaf which will be found on the right radius will evidently be No. 6, for it will occur after five times £ (tf), that is, after one re- volution minus £, and consequently on the nearest right-hand radius. Now we know that the number of secondary spirals is equal to the difference between the numbers of two consecutive leaves on one of these spirals ; therefore, if we suppose the fraction to be £, the number of the secondary spirals from right to left, that is, of the secondary spirals which follow the direction of the generating spiral, will be less PHYLLOTAXY. 85 than the number of the secondary spirals which follow an opposite direction. The same result can be obtained from the succeeding fractions. On the contrary (fig. 459 e), with the fractions f-, -^, ^f, and so on, we find that the right-hand radius is occupied by a leaf sooner than the left-hand one, and that in consequence the number of the first leaf 011 the right-hand radius is less than the number of the first leaf on the left-hand radius. Therefore the number of secondary spirals which can be followed from left to right is less than those from right to left, or, in other words, the most numerous secondary spirals turn in the same direction as the generating spiral, and knowing the direction of the one, we know the direc- tion of the other. The direction of the generating spiral varies not merely in the individuals of a species, but sometimes in the same individual. Thus, in cones from the same speci- men of Maritime Pine, right-to-left secondary spirals will be more frequent in some, and left-to-right in others ; but in all cases the relative direction of the generating spiral follows the law just enunciated. The angle of divergence itself is constant only in the fractions ±, ^, f, and when these cycles are more numerous, the one is often substituted for the other, which is owing to the distance between them being extremely small, and to the fact that the angles expressed by the fractions T\, ^T, -i-J, J-i, -|A, &c., if reduced to degrees and minutes, differ by a few minutes only ; so that the angles of divergence actually oscillate between 137° and 138°. A slight twist of the stem or axis is sufficient to account for so small a variation, and may well occur in rosettes of leaves, in involucral bracts, and in cones, and cast a doubt on the value of the angle of divergence. Thus, in Pines (fig. 459 d), the rectilinear series indicating the suc- cessive cycles may deviate more or less to right or left, so that the secondary spirals, which were the most obvious at the base of the cone, become less so in ascending, and render it difficult to determine such fractions as •§-, -fa, ¥8T. A change in the shape of the stem will also lead to the substitution of one cycle for another, as in certain Cacti with ribbed or angular stems bearing tufts of prickles, and whose ribs double as they ascend, and offer cycles of a higher number. Lastly, there are exceptional cases which perplex the student of Phyllotaxy; the above-named fractions are not the only ones which may be observed ; \, £, f , T3f , &c., do occur, though very rarely ; but when they do, they preserve among them- selves the same relations as the preceding, i.e. that each successive fraction may be obtained by the addition of the numerators and denominators of the two preceding. We have seen that whorled leaves present a succession of circular groups ; but here also, as in alternate leaves, the spiral arrangement is discernible. In a branch of Oleander, for instance, where the leaves are whorled in threes, a relation exists between any three vertically superimposed leaves of successive whorls ; and a line successively passing through their insertions will describe a regular spiral ; and if we examine the relations between the other leaves of these whorls, we shall perceive that the number of whorls represents as many parallel spirals as there are leaves in each of them. 8G OEGANOGEAPHY AND GLOSSOLOGY. ESTIVATION. ^Estivation (prcefloratio, cestivatio) is the arrangement of the floral organs in the bud, and is of especial importance in respect of the calyx and corolla. The leaves of each floral whorl may be inserted exactly at the same level (forming a true whorl), or at unequal heights, when they form a depressed spiral, the lowest leaf of which is necessarily the outermost. The true whorl presents two modes of aestivation — the valvate and the contorted. 1. ^Estivation is valvate (lameii8. I fcri I (i JX 1 V 7*^ 1 i- 18. J Oranj! e. 48.'). I.aurol. Portion of aiulrceciiun. btanicu (uiag.). 487. Bntomnf". Diagram. 486. NfirclwiiR p«eudo-Narr!t*us. 1'erianth laid open. sepals, three other stamens within the six preceding, also opposite the petals, and six carpels in two series : here we have a multiplication of the andro3cium and pistil, and besides this a collateral deduplication of the first whorl of the androecium. Whon the stamens are twice and thrice as many as the petals, and by their extreme closeness seem to form but a single whorl, it may be difficult to decide whether this is a case of collateral deduplication of the andrcecium, or of multiplication, or of a dedupli- cation of the corolla added to the normal androecium. This difficulty is increased when the stamens all cohere. If the stamens are placed exactly on a level, they may be formed by a collateral deduplication (Orange, fig. 483) ; if some are a little within or without the others, which is easily distinguishable, in spite of coherence, then it is a case either of multiplication or of parallel deduplication. It is a case of multiplication when the outer stamens alternate with the petals (Berberis), but of parallel deduplication when they are opposite to the petals (Geranium, fig. 473). SYMMETEY OF THE FLOWER. 93 Arrests and suppressions are due to failures of development, and affect more than all other causes the symmetry of the flower. Arrest is the condition of an organ the growth of which has stopped, so that it is reduced to a sort of stump, sometimes glandular ; suppression implies that an organ has never even been developed. The outer whorls are more seldom arrested or suppressed than the androecium and espe- cially the pistil, which occupies but a narrow area of the receptacle. The suppression or arrest of one or more pieces of a whorl affects the symmetry of number, position and form. For example, Berberis, whose calyx, corolla and andrcecium are in threes or multiples of three, has for pistil a single carpel ; the Pink (fig. 488), whose other whorls are quinary, has but two carpels ; the Heartsease three (fig. 489) ; in the Bitter Vetch (fig. 490) and other Papilion- acece, the two first whorls are quinary, the third decennary, 488. Pink. Diagram. 492. S'jrophularia. Diagram. 491. Snapdragon. Diagram. whilst the pistil is mono-carpellary ; it is the same with the pistil of the Plum and Peach. The Snapdragon (fig. 491), of which the calyx and corolla are quinary, has (owing to arrest) four stamens, and two carpels due to suppression. In Scrophularia, with the same arrangement, the fifth stamen is represented by a petaloid scale (fig. 492). The Periwinkle and other Apocynece, as well as many monopetalous families, have five sepals, five petals, five slamens, and two carpels ; Polygala (fig. 493) has five sepals, three petals (sometimes five, alternating with the sepals), eight half anthers (equivalent to four stamens), and two carpels. Umbel- lifercB (fig. 494) have five sepals, five petals, five stamens and two carpels. The Corn/lower, Dandelion, Chrysanthemum and other Composites have quinary corollas and androecia and a single carpel ; in most, the calyx degenerates into a pappus, though in some (Asteriscus, Hymenoxys) it presents five scales. In most Cucurbitacece (Melon, Pumpkin, Cucumber] the calyx and corolla are quinary and the stamens are reduced to two and a half. In apetalous, monoecious, and dkecious flowers, an entire whorl is suppressed or arrested (Lychnis, Sagina, Chenopodium, fig. 189) ; some- times several whorls are absent, as in the Nettle and Mulberry (fig. 495), which present only a calyx with an andrcecium, or a pistil. Sometimes several whorls are suppressed, together with one or more pieces of the remaining whorl ; the male flower 493. Polygala. Diagram. 494. Coriander. Diagram. 495. Mulberry. g flower (mag.). 94 OEGANOGEAPHY AND GLOSSOLOGY. of Euphorbia (fig. 333) consists of one whorl, reduced to one stamen ; and the female flower (fig. 406) of one whorl of three carpels ; the flowers of Arum (figs. 196, 197, 198) consist of a solitary stamen or carpel. Seeds, like the floral whorls, are subject to suppression and arrest ; in Geranium (fig. 474) the five carpels are two-ovuled, and but single-seeded ; the Oak (fig. 400) has three carpels forming three two-ovuled cells ; the septa become speedily absorbed through the rapid growth of one of the ovules, and the ripe fruit is one-celled and one-seeded. The Horse-chestnut presents a similar arrest. In the Cornflower and other Composites, in Wheat and other Gramineae, the ovule is solitary from the first ; at least, a second has never been discovered ; thus offering a case of suppres- sion and not arrest. The causes which disguise or disturb symmetry in any one flower are not always isolated. In Larkspur we have unequal develop- ment and symphysis in the calyx and corolla, multiplication in- the andrcecium, and suppression in the pistil ; in Asclepias (fig. 496) symphysis in all its whorls, multiplication in its corolla, dedu- 496. Asck-pias. plication in the second whorl of the corolla, and suppression in the pistil. Mignonette is an example of unequal development in its calyx, corolla and andro3cium ; of symphysis in its pistil, of parallel deduplication in its corolla, of collateral dednplication in its andrcecium, and of suppression in its pistil. THE FRUIT. The fruit (fnictus) is the fertilized and ripe" pistil, that is, a pistil enclosing seeds capable of reproducing the plant. It may be accompanied by accessory organs, which are considered as forming an integral part of it, and to which we shall return. • The fruit is apocarpous — 1, when its carpels are separate from each other (Columbine, fig. 497; Ranunculus, fig. 524; Bramble, fig. 521 ; Rose, fig. 525), when each carpel is considered to be a fruit ; 2, when the pistil is formed of a single carpel (Pea, Bladder Senna, fig. 498 ; Apricot, fig. 499 ; Wheat). It is syncar- pous, when its carpels are consolidated into a single body (Tulip, fig. 389 ; Iris, Campanula, fig. 390 ; Poppy, fig. 388 ; Heartsease, fig. 500). 4!i". Columbine. Fruit. 498. Bladder Senna. Fruit. 499. Apricot. Oj>en flower. 500. Heartsease. Ilipe pistil. According as each free carpel, or each cell of a syncarpous fruit, or each THE FRUIT. 95 unilocular composite ovary contains one, few, or many seeds, this carpel, cell, or ovary is said to be monospermous (monosperma), oligospermous (oligosperma], or many -seeded (polysperma). The ripe ovary is called a pericarp (pericarpium) ; we have already described the three layers of which it is composed (figs. 15, 16), epicarp, endocarp, and mesocarp or sarcocarp. Changes caused by Maturation. — In ripening, the fruit undergoes changes, some of which have been already mentioned t it may be dry, and then, according to its consistency, it is said to be membranous, corky, coriaceous, woody, bony; the latter quality is found in the Filbert (fig. 233) ; /^T~ sometimes it becomes fleshy through the XS^. V \ // abundant pulp of the seed;1 in Belladonna (fig. 567) the mesocarp is succulent; in the Orange (fig. 568) the pulp consists of long 501. Gooseberry. Fruit cut vertically. 503. Cneorum. Fruit cut vertically (mag,). 504. Tribulns. Fruit cut vertically (mag.). 502. Cassia. Portion of open fruit. 505. Eadish. Flower cut vertically. spindle-shaped cells, fixed to the endocarp by one of their extremities, and free at the other; in the Tomato it is the placenta, in the Gooseberry (fig. 501) and the Pomegranate it is the testa itself of the seed which is pulpy. In fruits with a succulent mesocarp, as Plum, Cherry, Peach, Apricot, Walnut, &c., the endocarp thickens at the expense of a portion of the mesocarp (figs. 16, 520), becomes bony, and forms the stone (putamen) . The septa sometimes disappear in the pericarp; as in Lychnis (fig. 398) and other Caryophyllacece, where the rapid growth of the walls of the ovary breaks and effaces them; in the Oak (fig. 400), where one ovule stifles the other five, and destroys the three septa; in the Ash (fig. 561), where one of the two cells contains a seed, while the other is reduced to an almost imperceptible cavity by the destruction of the septum. Sometimes trans- verse septa are developed in the ripening ovary ; these are horizontal expansions of the endocarp and mesocarp, which sometimes become woody (Cassia, fig. 502). In Cneorum (fig. 503) and Tribulus (fig. 504), the endocarp and mesocarp are gradually intruded from the inner wall of the ovary, so as to form oblique septa, which at maturity divide the cavity into small superimposed cells. The membranous transverse septa of the cells of the Radish pod (fig. 505), Raphanistrum, and some other Cruci- ferw, are longitudinal septa which the growth of the seeds has driven to right and left by the resistance of the endocarp ; in this case, the fruit dehisces transversely, each segment containing one seed. Suture. — The ventral suture (sutura ventralis] is the line indicated by the 1 The pulp rarely contributes to the formation of the seed; it aids in the dispersion of fruits by tempting birds, &c., and it is often an aid to the germination of the seed. — ED, 96 ORGANOGKAPHY AND GLOSSOLOGY. cohering edges of a carpellary leaf, and which faces the axis of the flower ; what ia (somewhat improperly) called the dorsal suture (s. dorsalis) is nothing but the median nerve of the carpel, which consequently faces the periphery of the flower.* This nerve may be masked by the parenchyma developed from the carpel, as in the Peach ; it is usually indicated either by a rib (Columbine) or furrow (Astragalus). The ventral suture may also be indicated by a rib (Pea) or furrow (Peach). In a many- celled ovary, the ventral sutures, occupying the axis of the flower, cannot be seen externally, and each cell is indicated by a dorsal line or rib; besides which, we generally see, on the walls of the compound ovary and between its dorsal furrows, other sutures, named parietal (sutures parietales) , which indicate the union of two septa, or of two parietal placentas (Mallow, fig. 225). In inferior ovaries, those are not sutures which we perceive on the walls of the fruit, but fibro-vascular bundles, which belong to the calyx-tube according to some, to the receptacular tube according to others (Currant). In this case, the calyx-limb often crowns the fruit, in the form of teeth (Fedia, fig. 216), or bristles (Scabious, fig. 229), or a pappus (Dandelion, fig. 222), or a crown (Pomegranate, Medlar). Accessory Organs. — The style sometimes remains upon the ovary, and grows with the pericarp as it matures ; it forms a flattened beak in the Radish and Rocket (fig. 506), a feathery tail in Pulsatilla and Clematis. The receptacle, which in some cases adheres to the ovary, necessarily forms a part of the fruit ; such is the recep- tacular tube which encloses the carpels in Apples, Pears, Quinces, Medlars, White- beam, Azarole, Haws, &c. ; such is also the receptacle of the Strawberry (tig. 507), which, though almost dry at first, gradually enlarges, becomes fleshy, and encloses the ovaries in its crimson parenchyma ; it is not then the pistil alone, but the enlarged receptacle which is prized in the strawberry, and which is usually regarded as the fruit; the carpels of the strawberry are insipid, and crack under the teethfcand the little black styles appear as dry deciduous threads. In the Fig (fig. 158), a fleshy receptacle encloses innumerable minute flowers, the lower female, the upper male. Exuviae. — The name ezuvice (induvice) has been given to the per- sistent withered remains of the calyx or corolla, or sometimes of the andrcecium, which per- sist around the fruit but do not adhere to it; in Campanula (fig. 544) the corolla withers and persists on the calyx ; in the Marvel of Peru the base of the petaloid perianth envelops the ovary, and resembles one of the integuments of the seed; in the Winter Cherry (fig. 508) the whole calyx persists, enlarging enormously, and enclosing the ovary in an inflated coloured bladder. In the Rose (fig. 509), the 508. Winter Cherry. Fruit shown by the. removal of half the calyx. THE FRUIT. 97 calyx-limb dries and decays, but the receptacular tube persists and becomes fleshy. In the ripe Mulberry (fig. 571), the female flowers of which form a dense spike, the four sepals are succulent, and enclose the pistil; they may thus themselves be regarded as belonging to the fruit. Involucres, which we have described in the paragraph on bracts, usually persist around the fruit and grow with it ; such is the case with the involucres of Composite, the cups of the Acorn (fig. 232), of the Nut (fig. 233), and of the Chestnut (fig. 234). Dehiscence. — Dehiscence is the act by which the ripe pericarp opens to let the seeds escape. Fruits which thus burst spontaneously are called dehiscent (dehiscens : Tulip, Iris, fig. 531) ; the term indehiscent (indehiscens) is applied to — 1, fleshy fruits which do not open, but decay, and thus free the seeds (Apple, figs. 448, 449 ; Peach, fig. 519 ; Melon, Pumpkin] ; 2, dry fruits, whose pericarp is pierced by the embryo in germination (Wheat, Buckwheat, Oat, fig. 526 ; Anemone, fig. 523). Valves (valvce, valvulce) are the pieces into which the pistil separates when ripe, to allow the seeds to escape ; according to the number of these, the fruit is said to be univalved, bivalved, &c. (univalvis, bivalvis, &c.) ; sometimes the separation is incomplete, the valves only opening to a half or a quarter of their length, or at the top only. Apocai'pous fruits dehisce by the ventral suture (Columbine, fig. 497 ; Larkspur, fig. 512 ; Caltha, fig. 511), or by the dorsal nerve (Magnolia), or by both at once (Pea, fig. 516, and other Leguminosce) ; in the latter case, there are two valves to one carpel. The dehiscence of plurilocular syncarpous fruits is septicidal (d. septicida) when the septa split into two parallel plates, and the united carpels separate (St. John's Wort, fig. 527 ; Colchicum, fig. 529 ; Mullein, Scrophularia, fig. 528) ; each valve then represents a carpel. The placentas may fall away with the valves, or form a solid central column (Salicaria, fig. 530). In all cases, the edges of the valves are said to be inflexed. The dehiscence of plurilocular syncarpous fruits is loculicidal (d. locu- licida) when it takes place by the dorsal suture ; this results from the septa being more firmly united than the median fibro-vascular bundles of the carpels; each valve then represents the halves of two carpels, and the valves are described as sep- tiferous in the middle (v. medio-septiferce). Sometimes the placentas are continued along the septa (Lily, Iris, fig. 531), at others they remain consolidated into a central column ; sometimes, again, the placentas may retain a portion or the whole of each septum, and the central column then presents as many wings or plates as there were septa in the ovary before its dehiscence (Rhododendron, Datura, fig. 532) ; this variety of loculicidal dehiscence is called septifragal. The same fruit may be both septicidal and loculicidal ; thus, in Foxglove, which is two-carpellary, the septa first separate, then the dorsal nerve of each carpel splits, and each of the four resulting valves represents half a carpel. Syncarpous fruits with parietal placentas usually dehisce by placental sutures, when each valve represents a carpel, and has placentiferous margins (val. marginibus placentiferce, Gentian, fig. 533), — or by the dorsal sutures, when each valve represenls the halves of two contiguous carpels, and is placentiferous in the middle (v. medio- •placentiferce, Heartsease, fig. 534; Willow, fig. 535), — or by the separation of the valves, H 98 ORGANOGRAPHY AND GLOSSOLOGY. which leave the placentas in their places (Wallflower, fig. 547; Clielidonium, fig. 54G). In some syncarpous fruits, the dehiscence is by valvules or teeth, variously placed, which, by diverging or ascending, form openings for the seeds to escape (Primrose, Lychnis, fig. 542; Snapdragon, fig. 545; Harebell, fig. 544; Poppy, fig. 543). Dehiscence is transverse ('/. transversals) when a compound ovary is halved transversely (Pim- pernel, fig. 537 ; Henbane, fig. 539 ; Purslane, fig. 538 ;• Plantain) ; — as also when apocarpous fruits break up transversely into one- seeded segments (Coronilla, Sainfoin, fig. 518). Dehiscence is irre- gular (d. ruptilis) in fruits with resisting septa and dorsal sutures, but uniformly thin walls ; thus, the pericarp of some Linarias (fig. 510) splits into longitudinal ribbons; the fruit of Momordica, Wild Oucumber, &c., rupture thus elastically. Classification of Fruits. — Many authors have attempted this ; but their efforts, though resulting in many valuable scientific observations, have sometimes given rise to a very obscure botanical terminology. Linnaeus admitted five sorts of fruit; Gaertner, thirteen ; Mirbel, twenty-one ; Desvaux, forty-five ; Richard, twenty-four ; Dumortier, thirty-three ; Liudley, thirty-six. The following classification, adapted from these several authors, appears to us the simplest and easiest of application ; it includes most of the modifications of form observable in the fruits of phsenogamous plants. Apocarpous Fruits. — 1. The follicle (folliculua) is dry, dehiscent, many-seeded, S 617. Lucerne. Fruit. 616. Pea. Fmtt. and opens by its ventral suture (CaWta, fig. 511 ; Larkspur, fig. 512 ; Peony, fig. 513), or very rarely by the dorsal only (Magnolia). Follicles are rarely solitary, but almost THE FKUIT. 99 nlways form a whorl (Columbine, fig. 497; Peony, fig. 513; Caltha, fig. 511), or head (Trollius, fig. 515). — 2. The legume (legumen) is a follicle opening into two valves by 520. Cherry. 521. Bramble. 522. Arum. Fruit cut vertically. Fruit. Fruit opened (mag.). 519. Peach. Fruit cut vertically. 523. "Wood Anemone. Whole achene and achene cut vertically. 524. Ranunculus. 523 bis. Cornflower. Achenes Fruit (mag.). in a head. 526. Oat. Truit (mag.). o, ovary ; T, testa ; H, a, c, embryo : A, albumen. its dorsal and ventral sutures (Pea, fig. 516). Some Leyuminosce have spirally twisted fruits (Lucerne, fig. 517) ; of others the fruit is indehiscent and one-seeded, hence a true achene (Trefoil) ; of others it is a lomentum, i.e. the legume is contracted at intervals into many cells by transverse septa ; when ripe, the fruit separates through the septa of the cells into one-seeded joints (Coronilla, Sainfoin, fig. 518) ; other legumes are vertically more or less perfectly two-celled, by the in- flexion of the dorsal (Astragalus, fig. 391), or ventral suture (Oxytropis). — 3. The drupe (drupa) is indehiscent, usually one-seeded, with a fleshy mesocarp, and stony or bony endocarp (Peach, fig. 519; Cherry, fig. 520; Apricot, Plum, Almond, Walnut). Acini are the small drupes forming the fruit of the Raspberry and Bramble, &c. (fig. 521). — 4. The simple berry only differs from the compound berry by originating in a solitary carpel (Berberis, Arum, fig. 522). — 5. The achene (achenium) is dry, indehiscent, with a single free seed (not adhering to the pericarp) ; it is solitary in the Cornflower (fig. 523 bis) and Dandelion-, agglomerated in the Ranunculus (fig. 524), Anemone (fig. 523), Rose, (fig. 525), and Strawberry (fig. 401). The utricle (utriculus) is an achene with a very thin, and almost membranous pericarp (Scabious, Amaranth, Statice). — 6. The caryopsis (caryopsis) is dry, indehiscent, with a single seed adhering to the pericarp (Wheat, Maize, Oat, fig. 526). Syncarpous Fruits. — 7. The capsule (capsula) is dry, one- or many-celled, and dehiscent; it is plurilocula-r and septicidal in St. John's Wort (fig. 527), Scrophularia, (fig. 528), Mullein, Colchicum (fig. 529), Salicaria (fig. 530) ; loculicidal in Lilac, Lily, Iris (fig. 531) ; septifragal in Datura (fig. 532), septicidal and loculicidal in Digitalis and Linum catharticum. The valves of the unilocular capsule are placentiferous at the edges in Gentian (fig. 533) ; placentiferous at the middle in Heartsease (fig. 534) and Willow (fig. 535). The capsule of Orchis (fig. 536) opens into three valves H 2 52".. Rose. Fruit cut vertically. 100 ORGANOGKAPHY AND GLOSSOLOGY. placentiferous at the middle, and the median nerves of the three carpels, united by their bases and tops, and crowned by the dry floral envelopes, persist after the valves fall away. In the circumsciss capsule (pyxidium, c. circumscissa) , the dehiscence is transverse (Plantain, Pimpernel, fig. 537 ; Purs- 527. St. .1 ul m's Wort. 528. Scrophnlaria. Fruit. 630. Salicaria. fruit (mag.). 631. Iris. Fruit. 536. Orchis. Fruit. lane, fig. 538 ; Henbane, fig. 539). In Mignonette (fig. 540), the capsule opens by the separation of the three sessile comiivent stigmatiferous lobes, without dividing into 53?. Datura. Fruit. 529. Colchicum. Fruit. 537. Pimpernel. Fruit (mag.). .138. Purslane. Fruit (mag.). 639. Henbane. Fruit. teeth or valves, and leaves an opening between them. In the Primrose, the capsule is five-valved at the top, by the fission of the dorsal nerves of the carpels. In the Pink (fig. 541), both the dorsal nerves and placental sutures split. In Lychnis (fig. 542), the capsule is similarly incompletely ten-valved. In the Poppy (fig. 543), the capsule opens by small tooth-like valves between the septa, below the disk formed by the style and stigmatic rays. In the Harebell (fig. 544), the capsule opens by five small valves at the base of the receptacular tube ; these openings are formed by the lower portions of the septa separating from the central axis, and carrying up with them a portion of the pericarp, in the shape of a little open door. In other species of Campanula the opening occurs at the upper part of the receptacular tube, where the edge of the septum is thickened and forms THE FEUIT. 101 a border with the concavity outside ; the bottom of this border rolls over the concavity, and ruptures the wall of the ovary, forming between each sepal a little round protuberance, and the seeds escape by pores which are on a level with their placentas. In the Snapdragon (fig. 545), 540. Mignonette. Fruit. 545. Snapdragon. Fruit. 644. Harebell. Fruit. the upper carpel, that next the axis, opens near the persistent style by small free valves ; the lower carpel, which is gibbous below, opens by two similar collateral valves, also near the style. The entire fruit, when seen in front, resembles a monkey's face, the style being the nose, the hole of the upper carpel the mouth, the two other holes the eyes, and the persistent calyx a head-dress. The siliqua (siliqua} is a capsule with two carpels ; it is properly one-celled (Chelidonium, fig. 546), but usually 547. Wallflower. Fruit. 548. Whitlow-grass. Fruit (mag.). 549. Cochlearia. Fruit. 550. Thlaspi. Fruit (mag.). 551. Bunias. Fruit. 552. Bunias. Fruit, open. two-celled by a spurious membranous septum, and opens from bottom to top by two valves, the seed-bearing parietal placentas persisting (Wallflower, fig. 547). The silicule (silicula) is a siliqua of which the length does not much exceed the breadth (Whitlow-grass, fig. 548 ; Cochlearia, fig. 549; Thlaspi, fig. 550). In some cases the siliqua is lomentaceous, separating transversely into one-seeded joints (Radish). In the Bunias (figs. 551, 552), each of the two cells of the silicule is two- seeded and two-celled, by a longitudinal septum. In Crambe (fig. 553), the silicule is compressed, and originally consists of two unequal one-seeded cells, but whilst the seed of the upper cell becomes developed, that of the lower cell is arrested, its funicle being strangled in the septum ; and the result is a one-seeded 554. Myagrum. Fruit, open. 102 ORGANOGRAPHY AND GLOSSOLOGY. indehiscent fruit. In Myagrum perfoliatum (fig. 554), the silicule contains only one seed, which occupies its lower half, and pushes up the septum ; the two upper cells are empty. In plurilocular capsules, the name cocci (cocci) has been given to one- or two-seeded carpels, which separate (often elastically), and carry the seeds with them, but Ii!>'>. Ceraniiitn. Km it (iiuig.). 656. Frnxincllu. Fruit. M7. Fruit. 63!). Cerinthc. Fruit. usually leave the placentas attached to a central column (Cneorum, Fraxinella, Euphorbia, Geranium, Mallow). In Euphorbia this central column consists of the placentas, and three double plates, which are portions of the septa, of which the other portions were carried away by the dehiscence of the valves. In Geranium (fig. 555) the five carpels separate elastically upwards, and roll over upon themselves ; the central column consists of the placentas and the edges of the carpellary leaves. In Mallows, the septa of the ten to fifteen carpels split, but the carpels do not wholly separate from the column ; a considerable portion of the septa adhering to it. In Fraxinella (fig. 556) the five caupols separate completely, and leave no column. The fruit of Angelica, JEthuaa (fig. 557), and other UmbellifercB is a capsule with two one-seeded cells, divided by a narrow septum ; its two carpels separate like cocci, and remain suspended at the top to the filiform axis or prolongation of the receptacle. Most botanists consider this fruit to be composed of two achenes ; but achenes are apocarpous fruits, and this fruit, being syncarpous, constitutes a true two-celled septicidal capsule, of which the only opening to the carpels is a narrow cleft, pre- viously occupied by a filiform axis. The fruit of the Bugle (fig. 558) is composed of four one-seeded lobes, which separate when ripe, often called achenes and nucules ; but the fruit of Borrauinece and Labiatw 560. Muplo. Frnit. Fruit open. . . J is now considered to be formed of two carpels, each distinctly two-lobed, and containing two seeds ; this is obvious in-Cerinthe (fig. 559). It has been demonstrated that in the very young buds of the THE FEUTT. 103 Sage and other Labiatce, tLere really are only two carpellary leaves, opposite to the two lips of the corolla. Such fruits are not collections of achenes, but syncarpous, the carpels being united below by the dilated style-base (fig. 409) ; it is a true capsule of two carpels, each of which becomes two-celled, and hence it simulates four distinct carpels. The samara (samara) is a dry, one- to two-seeded fruit, of which the pericarp forms a membranous wing above or round the cell (Maple, Ash, Elm, &c.) ; these, which are often placed among apocarpous fruits, are evidently composed of two united carpels. In the Maple (fig. 560), the two cells are distinct, and the fruit separates, as in Umbelliferce, into two cocci hanging at the top of a filiform axis ; it is therefore a true septicidal capsule, the only opening of the carpels being the narrow slit previously occupied by the axis. In the Ash (fig. 561), the septum is perpendicular to the faces of the ovary, and consequently the two sharp edges answer to the backs of the carpel; after flowering, all the ovules but one are arrested ; the septum is pushed back, one of the cells almost completely disappears, and the other is filled with the seed. The fruit of the Elm- (fig. 562) is similar ; one of the cells is one-ovuled, the other is empty from the first. The nucule (nucula) is an iiidehiscent capsule, with a bony or coriaceous pericarp, plurilocular when young, but one-celled and one-seeded by arrest (Oak, fig. 232 ; Filbert, fig. 233 ; Hornbeam, Beech, Chestnut, fig. 563 ; Lime, fig. 564). To the same category belong also the fruits of Fedia (figs. 565, 566) and other Valerianece, sometimes for convenience, but not accurately, called achenes. — 8. The berry (bacca) (whether compound or simple) is succulent, indehiscent, and has no stone ; it differs from the capsule only in its fleshy consistence, which frequently induces the suppression of the septa, and arrest of some of the seeds (Vine). There are some fruits 562. Elm. Fruit. 563. Chestnut. Fruit. 564. Lime. Fruit. 565. Fedia. Fruit cut transversely (mag.). 507. Belladonna. Fruit. which may equally be termed a berry or a capsule (Capsicum, Winter Cherry). Among species of the same genus, some are provided with a capsule, others with a berry (Galium, Asperula, Campion, Hypericum). The Privet, Nightshade, Belladonna (fig. 567), Vine, have a two-celled berry; Asparagus and Lily of the Valley, a three-celled berry ; Herb Paris, a four- to five-celled berry. Among plants with an inferior ovary, .the berry of Sambucus is three-celled, that of the Myrtle four- to five-celled ; Ivy, five-celled ; Coffee, two-celled ; Gooseberry, one-celled, with parietal placentas (fig. 501). The hesperidium (hesperidium) is a plurilocular berry, with an aromatic glandular epicarp, a dry and spongy mesocarp, an endocarp covered with 104 OEGANOGEAPHY AND GLOSSOLOGY. small watery cells which spring from the walls of the cavities, and extend to the seeds (Orange, fig. 568). The gourd (pepo) is a berry composed of three to five (rarely one) carpels, united to the receptacular tube, and forming a single cell wilh very fleshy seed-bearing parietal placentas (Melon, Pumpkin, Sechium, Briony}. The pome (pomum, melonida, figs. 569, 570), is a berry composed of many (usually five) cartilaginous carpels (E), v forming five cells, and united to the receptacular tube (T) (Apple, 6(j(S. Orange. Fruit cut transversely. 570. Apple. Fruit cut vertically. 6«9. Apple. Fruit cut transversely. 571. Mulberry. Fruit. Pear, Quince). — 9. The compound drupe (nuculanium) is fleshy, and encloses many stones, which are sometimes connate (Dogwood), sometimes free (Medlar, Beam, Sapotilla). Aggregate fruits is the name given to fruits that result from the union of several flowers ; these component fruits are included amongst the above-described varieties. In the Honeysuckle, the fruit is formed of two connate, but originally free berries. In the Mulberry (fig. 571), the true fruit consists of a spike or head of small drupes, each enveloped in a succulent calyx. The Fig (fig. 158) is a pyriform body, fleshy, hollow, bracteate at the base, the mouth furnished with little scales, and serving as a common receptacle to the flowers enclosed in its cavity, the males above, the females below. In the Pine-apple (fig. 572), the flowers are spiked and pressed round an axis 572. Pine-apple. 673. Pine. Carpel (uiag.) bearing two seeds. Oh, chalaza ; si , micropvle. 574. Pine. Fruit. 675. Cypress. Fruit. terminating in a tuft of leaves ; the ovaries form so many berries, but the calyces, the bracts, and the axis itself become fleshy. The Pine-cone (conus, strobilus) is an aggregate fruit, which has nothing in common with the preceding ; the carpels, represented by scales (fig. 573), have neither style nor stigma, and do not SEED. 105 577. Pea seed (mag.), deprived of half its integument and one of its cotyledons. close to shelter the seeds, but protect them by closely overlapping each other until ripe. They are sometimes woody, when they form either a conical spike (Pine, fig. 574), or a globular head (Cypress, fig. 575) ; when fleshy and connate, they simulate a drupe (Juniper, fig. 576). SEED. The seed (semen) of phsenogams is the ovule when fertilized, ripe, and ready for germination; it contains the embryo (embryo, plantula, corculum), which is destined to reproduce the mother-plant. Let us recapitulate the structure of the embryo in the Pea (fig. 577). It is composed of a caulicle (cauliculus, T), a radicle (radicula, E), two cotyledons (cotyledones, c), and a plumule (gemmula, plumula) ; it is enveloped by a double integument, of which the outer (i), or testa (testa), is attached to the hilum (hilus, umbilicus) by the funicle (funiculus, F), which rises from the placenta (placenta, p) ; and the inner (E), or endopleure,} (endopleura) provides a passage for the nourishing juices by the chalaza (chalaza, H), which communicates with the hilum by means of a cord (A), the raphe (raphe). Near the hilum is a small opening (M), the micropyle (micropyle), by which the ovule is fertilized by the pollen. As a general rule, the radicular end of the embryo answers to the micropyle, and the cotyledonary end to the chalaza ; the exceptions to this rule, which are rare, and do not invalidate it, will be specified. Relative Positions of Seed and Embryo. — It is important to observe that, in the early condition of the ovule, the hilum and chalaza are united ; consequently the raphe does not exist, and the micropyle occupies the opposite, or free end of the ovule; also that 1, the base of the fruit (ovary2), is the point by which this is attached to the receptacle, and its top is the point from which the style springs ; 2, the base of the seed is the point by which it is attached to the funicle or placenta, and which is indicated by the hilum ; the top of the seed is the extremity of an imaginary straight or curved line drawn through the axis of the seed. The axis of the ovary is defined in the same manner. The embryo has also its axis; its base is its radicular, and its top its cotyledonary extremity. The top of the seed is obvious tne whenever the hilum occupies either t*he extremity of the long axis of the seed, in| as is usually the case (Nettle, fig. 578 ; Sage, fig. 579 ; Chicory, 580) ; the hilum is placed at the middle of the long axis of the seed PL 578. Nettle. Achene cut vertically (mag.), showing one of the large the top of the ovary. but sometimes Gr. 579. Sage. Achene cut vertically (mag.), ov, ovary ; Gr, seed. 1 Sometimes called legmen. — ED. 2 Throughout this section tho authors speak of the seed in relation to the ovary, where we should say carpel or fruit. — ED. 106 OKGANOGRAPHY AND GLOSSOLOGY. (Lychnis, fig. 587) ; it is then ventral (h. ventralis), and when the seed is flattened (Madder) it is described as depressed (s. depressum), or peltate (s. peltatum) if it is convex on one side and concave on the other (Lychnis, Stellaria). In these latter cases it is difficult and superfluous to determine the top of the seed, but it is easy and 581. Setlnni. Flower cut vertically (inng.). 682. Valerian. Flower cut vertically (mag.). 583. Plumbago. Flower cut vertically (mag.). important to distinguish the ventral face, i.e. that facing the placenta, and the dorsal or opposite face. The seed is erect (s. erectum) when it is fixed to the bottom of the cavity of the fruit (Nettle, fig. 578; Saye, fig. 579). It is ascending (s. ascendens), when, being fixed to a central or parietal placenta, its top is turned towards that of the fruit (Sedum, fig. 581 ; Apple, fig. 570). The seed is reversed (s. inversum) when its base corresponds to the top of the fruit, whether the placenta is immediately under the style (Valerian, fig. 582), or at the bottom of the ovary, in which case the seed is suspended from an ascending basal funicle (Plumbago, fig. 583). The seed is suspended, pendent (s. pendulum), when it is fixed to a central or parietal placenta, with its top turned towards the base of the fruit (Apricot, Almond, fig. 583 bis). The distinction between reversed and pendulous seeds is often very slight, and these terms are often used indifferently to describe a seed of which the free end faces the bottom of the fruit. The seed is horizontal when fixed to a central or parietal placenta, with its axis at right angles to that of the fruit (Aristolochia, Lily, fig. 584). In certain two-ovuled ovaries one ovule may be pendulous and the other ascending (Horse-chestnut, fig. 585) ; in others with many seeds or ovules, some are ascending, others pendulous, and those in the centre horizontal (Colum- bine). All the terms indicating the position of the seed are equally applicable to that of the ovule. The radicle is superior (r. supera) when it points to the top of the ovary ; it is inferior (r. in/era] when it faces the bottom; thus corresponding to the erect and 683 bit. Almond. 584. Lily. Ovary cut transversely (mag ). 585. Horse-cliestmit. Pistil cut vertically (mag.). SEED. 107 ascending seeds. . Thus, the Nettle (fig. 578) has an erect seed and a superior radicle; the axis of the seed is straight, the radicular end being furthest from the cotyledonary, which answers to the hilum. In the Sage (fig. 579) and Chicory (fig. 580), the seed is erect, with an inferior radicle; here the embryo seems to have twisted half round upon itself; the cotyledonaiy end, which ought to answer to the hilum, being at the opposite extremity, and the radicle nearly occupying its place ; this movement has taken place in the cavity of the ovule before fertilization, as we shall presently explain ; the result is a long raphe, which runs along one side of the seed, and the chalaza is consequently diametrically opposite to the hilum. The radicle is centri- petal (r. centripeta) when it faces the central axis of the fruit (Lily, fig. 584) ; centri- fugal (r. centrifuga), when it faces the circumference (Mignonette, fig. 384). The 686. Wallflower. Seed cut vertically (mag.). 587. Lychnis. Seed cut vertically (mag.). 588. Datura. Seed cut vertically (mag.). 589. Marvel of Peru. Fruit cut vertically. 591. Plantain. Ventral surface of seed (mag.). 592. Plantain. Seed cut vertically (mag.). embryo is antitropal (e. antitropus), when, its axis being straight, the micropyle (and radicle) is furthest from the hilum (Nettle, fig. 578 ; Rumex, fig. 644) ; it is homo- tropal (e. homotropus) when, its axis being straight, the micropyle (and radicle) is next the hilum, while the chalaza (and cotyledonary end) is distant from the hilum, and only connected with it by a raphe ; then the base of the seed (hilum) and of the embryo (radicle) correspond (whence the term homotropal, Sage, fig. 579; Chicory, fig. 580 ; Pear, Apricot, Rose, Strawberry, Scabious, Centranthus, Campanula, Hearts- ease, Iris, &c.). The embryo is amphitropal (e. amphitropus) when, its axis being bent, the micropyle and chalaza are both close to the hilum (Wallflower, fig. 586 ; Lychnis, fig. 587 ; Datura, fig. 588 ; Marvel of Peru, fig. 589 ; Mulberry, fig. 590). The embryo is heterotropal (e. heterotropus) when, from the unequal growth of the coats, neither extremity of the embryo corresponds to the hilum, and the radicle does not correspond 59C. Pine. Seed. 590. Mulberry. Ovary cut vertically (mag.). 594. Asparagus. Seed cut vertically (mag.). 595. Spergularia Seed (mag.). to the micropyle ; in this case, the axis of the embryo is sometimes parallel to the plane of the hilum (Pimpernel, Plantain, figs. 591, 592), sometimes oblique to it (Wheat, Chamcerops, fig. 593 ; Asparagus, fig. 594) ; the radicle is then said to be eccentric (r. vaga, excentrica). 108 ORGANOGEAPHY AND GLOSSOLOGY. Form and Surface of the Seeds. — According to their form, seeds are globular, ovoid, reniform, oblong, cylindric, turbinate, flattened, lenticular, angular, &c. ; some are irregular, flat, and rather like grains of sawdust, and are said to be scobifyrm (s. scobi- formia) ; flattened seeds with thick and projecting edges are said to be margined (s. marginata) (Spergularia, fig. 595), or winged if these margins become broad and membranous (Bignonia, Pine, fig. 596). The surface may be smooth (s. Iceve, Colum- bine, fig. 597) ; wrinkled (s. rugosum, Fennel, fig. 598) ; striate (s. striatum, Tobacco, fig. 599) ; ribbed or furrowed (s. costatum, Larkspur, fig. 600) ; reticulate (resembling a sort of network (s. reticulatum, Cress, fig. 601) ; punctate (s. punctatum), i.e. marked with little dots; alveolate (s. alveolatum), i.e. covered with little pits resembling fiOl. Cress. Seed (mag.). f>02. Poppy. Seed (mag.). honeycomb (Poppy, fig. 602) ; tubercled (*. tuberculatum) , i.e. furnished with small rounded projections (Stellaria, fig. 603) ; aculeate (s. aculeatum), i.e. bristling with small points (Snapdragon, fig. 604) ; glabrous (Flax) ; hairy (Cotton). Some seeds have a pulpy testa (Gooseberry, fig. 605 ; Pomegranate) ; others are covered with oily glands, often arranged in bands (Angelica, fig. 606) ; sometimes placed in furrows (Juniper, fig. 607). The hilum, or point by which the seed is attached to the funicle or placenta, forms a depressed or prominent scar ; in the middle or towards one side of this scar, is the umbilicus, a very small simple or compound orifice, indicating the passage of the nourishing vessels of the funicle into the seed. The chalaza, or internal hilum, i 604. Snapdragon. Seed (mag.). 605. Gooseberry. Seed cut vertically (inag.). 606. Angelica. Seed (mag.). CO". Juniper. Seed (mag.). 608. Orange. Seed, open. forms sometimes a more or less distinct protuberance, sometimes a sort of knob, sometimes a simple blotch (Orange, fig. 608, Almond). The raphe, which maintains the communication between the hilum and chalaza when these are separated during the development of the ovule, appears like a band along one side of the seed ; often it branches out in the thickness of the testa (Almond, Orange, fig. 609). The micro- pyle, which in the ovule formed a large gaping opening, remains visible on some seeds (Bean, Kidney -bean, Pea) ; it disappears in most, but its position is usually indicated by that of the tip of the radicle. The Proper and Accessory Coats of the Seeds. — Seeds do not always possess a SEED. 109 distinguishable testa and endopleure; often, when ripe, all the coats merge into one, or one splits up into several layers, and the seed presents three or four coats. The origins of these envelopes will be described under the development of the ovule. Arils are accessory organs, which mostly develop after fertilization, and cover the seed more or less completely, without adhering to the testa ; some are expansions of the funicle, and are specially designated as aril (arillus) (Nymphcea, Passiftora, Opuntia, Willow, Yew) ; others arise from the dilatation of the edges of the micro - pyle, and are called by some authors arillodes or false arils (arillodes). In the White Water Lily (fig. 610) a swelling (A, A), rising from the funicle (F), gradually spreads over and caps the ovule, and ends by closely enveloping the seed, without adhering to it, leaving scarcely a trace of an opening over the chalaza (Ch.). In Passion-flowers M. Ck J 610. White Nymphffia. Vertical section of the young Seed (mag.). 6H. Yew. 611. Willow. Ripe fruit, sunk in Seed (mag.). its fleshy aril. 615. 616. 617. 618. European Spindle-tree, showing the successive developments of the arillode. an annular swelling, with a free membranous torn margin, forms at the shortened end of the funicle, round the hilum ; this gradually expands, and ends by en- closing the seed in a loose fleshy bag, with a large opening towards the chalaza. In Willows (fig. 611), the very short thick funicle expands into an erect pencil of hairs, which envelops the seed. In Cactus Opuntia, two concave boat-shaped expansions spring laterally from the funicle, into which the ovule is pushed, and within which it is developed ; this accessory envelope thickens, hardens, and forms a sort of stone, covered with pulp. In the Yew, the female flower (fig. 612) consists of a single ovule, which is at first protected only by the scales of the bud from which it issued, and after fertilization disengages itself from these, when it is completely naked, with a gaping micropyle at its summit. Soon (fig. 613), between the ovule and the scales at its base, a small cup is developed, which gradually swells, becomes red and succulent, and ends by almost entirely covering the seed (fig. 614) ; this cup is nothing but an enormous development of the funicle, which thus furnishes an envelope to the fruit, which had not'even the protecting scale of the Pines and Firs (tig. 379). In the Spindle-tree (figs. 615, 616, 617, 618), the successive stages of development of the arillode (a) are easily followed (1, 2, 3, 4) ; it does not spring from the funicle (/), but from the micropyle, the edges of which dilate by degrees so as to form around the seed a succulent, loose, folded bag, open towards the chalaza. 110 OEGANOGRAPHY AND GLOSSOLOGY. It must be observed that this arillode, starting from the micropyle, which is very near the hiliim, unites at a very early stage with the funicle, of which it appears to be an appendage, but its origin may be recognized in very young ovules. In the Nutmeg, the fleshy and honeycombed envelope of the seed, which forms the aromatic substance called mace, may be looked upon as an expansion of the micropyle. In Euphorbia (fig. 619), the circumference of the micropyle, which formed at first a little swelling, thickens enormously after fertilization, and forms a small fleshy disk, of which the central canal, at first filled with the conducting tissue, becomes by degrees stopped up. In Poly gala (fig. 620), the little three-lobed body at the base of the seed has the same origin as the disk of 621. ABcleptas. Seed (111:11.0 with hairy arillode. (119. Euphorbia. 620. Polygala. Scot! crowned by See.l capped by a a fleshy arillode cartilaginous arillode (mag.). (mag.). 622. ITenrtscaw. Seed (mag.). 62;t. CheUdoninm. Seed cnt vertically (mag.). Euphorbia, and the micropyle is visible long after fertilization. In Asclepias (fig. 621) the tuft of hairs which crowns the seed is also an arillode proceeding from the micropyle. The name of strophioles (strophiolce, carunculai) has been given to excrescences on the testa which are independent of the funicle or micropyle, as the glandular crest which in Heartsease (fig. 622) and Chelidonium (fig. 623) marks the passage of the raphe ; the cellular mass which in Asarum (fig. 624) extends from the hilum to beyond the chalaza, and the tuft of hairs at the chalaza in Epilobium (fig. 625). The name aril having been indifferently applied to true arils, arillodes, strophioles, &c., it would be advisable to keep this term as a general name for excrescences of various sorts which appear upon seeds, and to limit the meaning by an adjective indicating their origin. We should thus have & funicular aril (Willow, Nymphcea, Yew}; a micropylar aril (Spindle-tree, Euphorbia, Polygala, Asclepias) ; a raphean aril (Chelidonium, Asarum} \ a chalazian aril (Epi- lobiuni), &c. A second adjective might denote its membranous, Jleshy, hairy, &c. texture. i;:'.">. rpilobiuui C'lmluzian tuft of hairs. IVrboris. «2ti. Tine. S> cd cut Kmbryo vertically (mag.), (mag.). Walnut. Seed o;it vertically. ' •iipcuta. fl'2it. Lime. Kmhn c, , ,,i|, ,| Kmbryo spread round its out (mag.). albumen (mag.). Embryo or Young Plant. — In most phaeuogamic plants the embryo is dicotyledonous, SEED. Ill whence the name Dicotyledons. Some species (Pines, fig. 620), possess six, nine, and even fifteen whorled cotyledons. Other phsenogamic plants have only one cotyledon ; whence the name Mono- cotyledons. The colour of the embryo varies ; it is white in most plants, yellow in some Cruciferw, blue in Salpiglossis, green in the Spindle-tree and Maples, and pink in Thalia. The cotyledons are generally fleshy, their parenchyma is oily in the Walnut and the Almond, and mealy in the Kidney-bean ; they have sometimes dis- tinct nerves (Berberis, fig. 627) ; they are sessile or petioled, or reduced to a petiole without a limb ; this is especially the case in monocotyledons. They are usually entire and equal, but may be lobed (Geranium, Walnut, fig. 628), or palmate (Lime, fig. 629), or very unequal, with the smaller so minute that the plant might be mis- taken for a monocotyledon (Trapa). Those of the Nasturtium and Horse-chestnut unite as they grow old into a compact mass. In some parasites they entirely disappear, and the embryo is reduced to its axis ; as in Cuscuta (fig. 630), whose thread-like stem 652. Bindweed. 631. Mallow. Embryo spread Embryo (mag.). out (mag.). 633. Wallflower. Transverse section of seed (mag.). 634. Rocket. Transverse section of seed (mag.). ; and living on plant, like the is attached to the plants it preys on, by suckers (p. 16, fig. 48) their juices, it needs no leaves to elaborate sap; and the adult embryo, possesses no leaves. Cotyledons are sometimes folded in halves, along their median line ; or convolute (Mallow, fig. 631) ; or spiral (Hop] ; or crumpled (Bindweed, fig. 632) ; the embryo itself is straight, or curved, or zigzag, *>r annular, or spiral, or rolled into a ball, &c. Often the radicle is turned up on the cotyledons ; if it is then placed against their commissure it is said to be lateral, and the cotyledons are accumbent (c. accumbentes, Wallflower, fig. 633) ; if it is on the back of one of the cotyledons, it is said to be dorsal, and the cotyledons are incumbent (c. incumbentes, Rocket, fig. 634). Some seeds contain several embryos ; the Orange (fig. 635) has often two, three, or four unequal, irregular, and convolute, the cotyledonary ends of all facing the chalaza, and their radicles facing the micropyle ; they all leave the seed at the period of germination (fig. 636). The seed of the A Imond frequently pre- sents two superimposed embryos, one of which appears to proceed from the first, like successive intern odes (fig. 637) ; they may be easily separated (fig. 638), when their respective radicles and two cotyledons can be plainly seen. The monocotyledonous embryo is usually cylindrio or ovoid ; to distinguish the T 636. Orange. Germinating seed. T, testa ; c, included cotyle- dons ; PL, steins ; G, plan- tules. 112 ORGANOGRAPHY AND GLOSSOLOGY. parts of which it is composed, it must be cut vertically, when it usually discloses an elongated axis with a small protuberance marked with an oblique or vertical fissure : this protuberance represents the plumule ; the fissure through which the two first leaves will appear marks the separation between the caulicle and cotyledon. Owing to the small size of the parts, it is sometimes difficult to distinguish the cotyledonary from the radicular end ; but the latter, which answers to the micropyle, is usually nearer to the integument than the former ; this is evident in the seed of Arum (fig. 639). In Oats and other Graminece (fig. 640), the seed, if halved longitudinally along the furrow on its inner face, discloses a very abundant farinaceous parenchyma (A), of which we shall presently speak ; from the base of the seed along its dorsal face rises the embryo (R, G, c), of a fellow, semi- transparent colour ; within this is a fleshy leaf (c), which extends one-third of the length of the seed ; this leaf encloses several others, successively smaller (G), which enfold each other, and are placed between the largest leaf (c) M and the dorsal face of the ovary (o) ; all rise from .c ..Col f>39. Arum. Seed cut vertically (mag.). 641. Oat. Isolated embryo seen ou its outer face (mag.;. 643. Aconite. Seed cut Vertically (mag.). BIO. Oat. Vertical section of fruit (mag.). f>42. Oat. Germinating embryo, (mag.). an enlarged neck which narrows towards tfie base into an obtuse cone ; the interior leaf (c) is the cotyledon, the others (G) form the plumule, the conical disk is the caulicle, terminated by the radicular end (R). If we extract the entire embryo (fig. 641), we perceive the cotyledon, which is large, and hollowed into a sort of spoon-shape, in the middle of which lies the plumule, forming a closed bag ; in the middle of this bag is a very small longitudinal slit, which enlarges later into a sheath, to open a passage for the contained leaves ; below is the caulicle, bearing the cotyledon on its side, and the plumule in its axis ; its free end is terminated by rounded protuberances, in which holes will form, whence radicular fibres will emerge at the period of germination, as from so many sheaths (fig. 642, Col.). Albumen. — Many seeds contain, besides the embryo, a disconnected accessory mass of parenchyma, named albumen (albumen, perispermum), the formation of which will be explained in the chapter on the Ovule. It is destined to nourish the embryo, and exists at an early period in all seeds ; if only a portion of it is absorbed by the embryo, the rest hardens, up to the period of germination, and the embryo is said to be albuminous (e. albumin osus) ; if it be absorbed, the embryo is eteattruminoUa SEED. 113 (e. exalbuminosus) . The albumen may be very copious (Aconite, fig. 643), or extremely thin and almost membranous ; in general it is largest when the embryo is smallest, and vice versa. It is said to be farinaceous (a. farinaceum), when its cells are filled with starch (Buckwheat, Barley, Oats, fig. 640; Rumex, fig. 644) ; fleshy (a. carnosum), when its parenchyma, without being farinaceous, is thick and soft (Berberis, fig. 627 ; Heartsease, fig. 645 ; Nightshade) ; mucilaginous (a. mucilaginosum) , when it is suc- culent and almost liquid ; it is then rapidly absorbed, and may almost entirely dis- 644. Rumex. Fruit cut vertically (mag.). 645., Heartsease. Seed cut vertically (mag.). 646. Poppy. Seed cut vertically (mag.). 647. Nympheea, Seed (mag.). 648. Rose Campion. Seed cut vertically (mag.). 649. Ivy. Seed cut vertically (mag.). appear (Bindweed} ; oleaginous (a. oleaginosum) , when its parenchyma contains a fixed oil (Poppy, fig. 646} ; horny (a. corneum), when its parenchyma thickens and hardens (Galium, Coffee, Iris] ; like ivory (a. eburneum), when it has the consistency and polish of ivory (Phytelephas). In Pepper and Nymphcea (fig. 647), &c., the seed contains two sorts of albumen ; which will be noticed when treating of the ovule. The embryo is axile, when its direction corresponds with that of the axis of the seed (Heartsease, fig. 645) ; it is peripheric (e. peri- phericus], when it follows the circumference of the seed, and surrounds the albumen (Rose Campion, fig. 648) ; it is ruminate (a. rumina- tum), when the testa or endopleura forms folds which are projected in the interior of the seed, and form incomplete septa in the thickness of the albumen, like the folds found in the double stomach of ruminating mammals (Ivy, fig. 649), Germination. — Germination is the action by which the embryo grows and throws off its coats, finally supporting itself by draw- ing its nourishment from without. The free end of the caulicle (fig. 650, T), terminated by the radicle, usually enlarges the orifice of the micropyle, and emerges ; soon the entire caulicle throws off its envelopes, with 65natingangec, the cotyledons (c) and the plumule (G) ; the latter lengthens in its turn, and its little leaves expand as it rises; at the same time the radicle develops, and descends into the earth. If the caulicle, which is the first internode C50. Kidney-bean. Seed germinating. gernn- cotyledons enclosed in the testa, T. 114 OEGANOGKAPHY AND GLOSSOLOGY. of the plant, lengthens during germination, the cotyledons are raised, and appear above ground ; they are then said to be epigeal (c. epigcei, Kidney-bean, fig. 650 ; Radish., Lime}. When the caulicte is very short, and the plumule (which forms the second internbde) rapidly lengthens, the cotyledons remain in the ground, often even within the seed-coats ; they are then said to be hypogeal (c. hypogcei, Spanish Kidney - bean, Oak, Graminece, Orange, fig. 651). In monocotyledons, the evolution of the radicle presents a remarkable pecu- liarity : it is provided at the base (fig. 642) with a sort of sheath, named the coleorhiza ; this is nothing but an outer cellular layer which, having been unable to accompany the development of the radicle (R), has been pierced by it. ANATOMY. IN ORGANOGRAPHY we have described the fundamental organs which provide for the growth and reproduction of plants ; namely, the root, the stem, the leaves, the floral whorls, and the seed ; but these are themselves composed of parts which cannot be studied without the aid of the microscope. These parts, the structure of which varies but little in different plants, and which are elementary vegetable tissues, are named elementary organs ; and the science which treats of them is called Vegetable Histology, or Vegetable Anatomy. ELEMENTARY ORGANS, If we examine microscopically the thinnest possible slice of a stem, root, leaf, or floral organ, it will present many different cavities, some entirely enclosed in walls, others having no proper walls, but being interspaces between the first ; taken together, they present the appearance of a fabric or tissue ; whence the name vege- table tissue. The closed cavities present three principal modifications t — 1. Cells. — Their diameter is [originally] nearly equal every way. 2. Fibres. — These are longer than broad, and their two ends are spindle-shaped. 3. Vessels? or lengthened sacs, the two ends of which cannot be seen at once under the microscope. Cells are very variable in shape, depending on the manner in which they are arranged. If they are not crowded, they retain their primitive form of spheroids or ovoids (fig. 652); but if the contiguous faces become pressed together in the course of their growth, they become poly- hedral, and may be dodecahedrons, or four-sided prisms, either lengthened into columns, or tabular, or cubical. A transverse section of prismatic cells presents equal squares, a vertical section of dode- cahedral cells presents hexagons (fig. 653) like a honeycomb ; whence the name of cellular tissue given to these cells collectively. Lastly, the cells may be placed end to end, like superimposed cylinders or barrels (fig. 654). When the cellular tissue (parenchyma) is very compact, there are no interstices I 2 652. Elder. Punctate cells. 653. Elder. Cellular tissue of the central pith. 654. Lily. Elongated cells. 116 ANATOMY. between the surfaces of the cells ; but if the tissue is loose, the cells retain their rounded form, and leave larger or smaller intercellular canals (fig. 655). These spaces occur between polyhedral cells when an interposed liquid or gas displaces them ; and it may happen (fig. 655) that if a regular pressure is exerted in neigh- bouring spaces, each of which is circumscribed by a small number offp cells, the latter may be disjointed, and a portion of their walls pressed inwards; but where there are two contiguous spaces, the pressures from without will counteract each other, and the cells remain coherent ; they then take the shape of stars, the contiguous rays forming isthmuses which separate the spaces. Sometimes the intercellular space is circumscribed by a great many cells ; it is then called a lacuna. These lacmice do not always result from the displacement of the surrounding cells, but from the destruction of several of them, or the rapid growth of the plant. In their earliest condition cells are sacs surrounded by a thin homogeneous membrane, which is soft and moist at first, but dries by degrees. Sometimes this membrane constitutes the sole wall of the cell, sometimes it is lined by a second ; but the latter does not form a continuous sac ; it is wanting here and there, and only partially lines the outer membrane ; the result is that there are thin areas where «.'>«. Elder. Rayed cells. 657. Mistleto. 658. Mistleto. Rayed and reticulate cell. Annular cell. there is but one membrane, and thick areas where there are two. When the inner membrane is deficient only in small spots, these appear as punctures (fig. 652) or short lines (fig. 656) ; when it is absent over considerable irregular areas, the thin places form an irregular network (6g. 657), of which the open parts answer to those where the inner membrane is wanting, and the thieads to the parts where it lines the outer membrane. Lastly, when the solution of continuity of the inner membrane is extremely regular, the open spaces are separated by parallel 'thickened rings (tig. 658), or a thickened spiral which passes from one end of the cell to the other (fig. 659). Cells may either be homogeneous, or punctate, or rayed, or reticulate, or spiral, or annular ; and in many cases the same cell passes successively through more than one of these forms. It frequently happens that a third, fourth, or fifth membrane is developed within the second, by which the wall of the cell is corre- spondingly thickened. It has been observed that these successive membranes usually mould themselves upon the second, so that the thin and thick portions of the cell correspond throughout. Fibres. — The length of these varies, but most have a very thick wall, formed at first of a single membrane, lined by a succession of others developed within it ; and as the cavity of the fibre diminishes more and more with age, the fibre finally appears ELEMENTARY ORGANS. 117 660. China regia. Fibres cut transversely. nearly filled up. The canal which forms its axis is cylindric ; but its outer walls, which are pressed against those of the neighbouring fibres, are flattened and pris- matic, as may be seen by a transverse section of fibrous tissue (fig. 660). The fibres, being spindle-shaped at their extremities, cannot be in juxtaposition throughout their length, but the extremities of other fibres are inserted between their free portions, and hermetically close' the conical interspaces above and below them (fig. 661). When the successive inner layers completely line the outer layer, as frequently happens, the cavity of the fibre remains smooth ; if the second layer does not com- pletely line the first, spiral or reticulate thickenings are the result (spiral or reticulate fibre] ; and dotted or punctate fibre (fig. 661), the most common form of all, is the result of the failure of the inner layer over minute areas. Vessels are much elongated tubes, the walls of which are never smooth, but present either slender spots or lines, or a close network, or rings, or spiral lines ; they are cylindric, and constricted at intervals (fig. 668). The contractions are circular and hori- zontal and close set, or oblique and distant. If the vessel be boiled in dilute nitric acid, it breaks up at the striae. Where the constrictions occur, membranous folds often project jis lings or perforated diaphragms into the interior; whence it has been concluded that the vessel is formed partly of cells, partly of fibres joined end to end, of which the ends, which at first formed septa, have gradually become obliterated or. per- forated. The vessels, like the cells and fibres, are named, according to the appearance of their walls, punctate, striate, reticulate, annular, spiral. The spiral vessels, or trachece (fig. 662), are membranous tubes, uninterruptedly traversed within by a pearly white spiral thread; this thread is neither tubular nor channelled, but cylindric, flattened (fig. 663), or a four-sided prism. The tracheae being spindle-shaped at each end (fig. 662), are regarded as elongated fibres. Nothing is easier than to examine these tracheae : if young shoots of Rose or Elder be gently broken, there will be seen by the naked eye between the ruptured 662. Melon, surfaces a spiral thread, lengthening and shortening like a piece of elastic. The outer membrane is not so obvious, except when the coils of the spiral thread are very remote. In most . Mamillaria. Trachea. cases the spiral thread is single, but it may be double, and sometimes as many as twenty form a ribbon (Banana) and can be unrolled together. Finally, a spiral thread, which was originally single, may become folded and broken up into finer threads (Beet-root). Annular vessels (fig. 664) are membranous tubes girt within by rings, which 118 ANATOMY. may be incomplete, or spirally twisted (fig. 665), whence they have been mistaken for old tracheae ; they, however, differ from tracheae in that they never present in their earliest condition a regular and continuous spiral, and that many intermediate forms between the ring and the spiral occur in every such vessel ; as, h-^vever, they termi- nate in tapering cones, they have evidently the same origin as the tracheae. Reticulate vessels are a modification of the annular ; if rings are so placed as to touch at intervals, they resemble a network, and the same vessel may be both annular and reticulate (fig. 666). Striate vessels are membranous tubes, cylindric or pris- matic, the inner membrane of which resembles a web, whose interstices form thin more or less regular striae. In prismatic vessels (fig. 667) the striae extend to the angles, and the interstices resemble the rungs of a ladder, whence their name of scalariform vessels. Striate vessels ori- ginate as a series of superimposed cells ; others as fibres, as shown by their spindle-shaped ends. 604. Melon. Annular vessel. 66.1. Melon. Spiral and annular vessel. fifiC. Melon. Ilvtlciilute and annular vessel. 667. Brake. Rayed prismatic vessels. MR. Melon. D°ited Punctate moniii- QQQ\ are membranous form vessel. ' tubes of which the inner membrane is perforated by small holes forming parallel series of oblique or horizontal dots; the vessel presents equidistant constrictions corresponding to circular folds in the interior, clearly indicating that the punctate vessel is formed by superim- posed cells of which the connecting surfaces have been absorbed. Punctate vessels with deep constrictions resemble chaplets of beads, whence their name of moniliform or beaded vessels. Laticiferous Vessels. — We have seen that proper vessels present inequalities resulting from the modifications of the inner membrane ; there are others with smooth transparent and homogeneous walls, which contain a peculiar juice named the latex (fig. 669) ; these anastomose, and form a complicated network, of which the tubes meet at right or acute angles; these tubes are usually fins, cheiidonium. cylindric, and swollen here and there (fier. 670), Laticiferous vessels. • \ to /' 670. Dandelion. Laticiferous vessels. from the accumulation of latex in certain places ; below these swellings the vessel is gradually constricted, and the communication between the constricted and swollen portions is interrupted. The laticiferous vessels ELEMENTARY ORGANS. 119 are thus distinguished from proper vessels by their transparent walls and by branching. Union of the Elementary Organs. — Botanists are divided in opinion as to the forces which caiise the walls of the elementary organs to cohere ; some think that the walls of the cells are originally semi-fluid, and hence become agglutinated, and remain so even after the plant has ceased to live ; others consider that an inter- cellular secretion cements the adjacent cell- walls. A third opinion is that vegetable tissue originates as a homogeneous plasma, which gradually thickens, and ends by forming vacuoles, which afterwards become the cavities of the cells ; a common septum therefore separates the neighbouring cells; but soon each cell becomes individualized, the septum doubles more or less completely, and the cohesion between the cells is due to an interposed cellular tissue. This theory differs from the second, inasmuch that in the latter the cells are cemented by a subsequently secreted matter, while in the former the cells are united by an unorganized tissue, developed cotemporaneously with themselves ; this unorganized tissue then itself becomes cellular, and finally separates the previously individualized cells which it originally united. Communication is established between elementary organs in various ways ; it has been stated that it takes place by means of the destruction of the contiguous surfaces of cells and fibres placed end to end, from which there results a vessel ; communication can also be established through the walls of cells, either by the disappearance of the outer membrane, or by slits or holes at different points of its wall, or simply by pores rendering these membranes permeable. Contents of the Elementary Organs. — The contents of these are very various : gaseous, liquid, or solid. Cell-contents appear as scattered or agglomerated granules, which in very young cells usually assume a lenticular form, and rest against the wall, or are even buried in its thickness (fig. 654) ; this body (the nucleus, cytoblast, or phacocyst of the cell) is regarded by botanists as a germ which, by its development, will produce a new cell. In most cases the nucleus becomes less distinct as the cell develops. According to the recent labours of M. Hartig, the nucleus is principally formed of small particles of matter analogous to albumen, a certain number of which are transformed into vesicles, which again give origin to cellulose, fecula, chlorophyll and aleurone. Cellulose is an insoluble substance forming the cell-walls, fibres, and vessels, the composition of which is identical in all plants. Woody tissue or lignine is nothing but the thickened and condensed cellu- lose ; to its density wood owes its hardness ; the stony particles in the flesh of pears and the stones of fruits are also formed of it. . Fecula or starch may be recognized by its blue-violet tinge when acted on by iodine, by its insolubility in cold water and its coagu- lation in hot water ; its chemical composition is that of cellulose. Starch-grains are generally spheroidal or irregularly ovoid (fig. 671) ; their surface presents concentric circles around a point which usually occupies one of the ends of the granule. These circles indicate so many layers, superimposed around a small nucleus; thus the starch-grain is developed from within outwards, that is, in the reverse way to the cell 120 ANATOMY. which contains it. Starch-grains may be easily examined by moistening a slice of cellular tissue containing them ; a drop of iodine will then jpolour the starch- grains blue- violet, and bring out clearly the distinction between the cell and its con- tents. If there be grains of albumen accompanying the starch-grains, the iodine will colour them brown or yellow. Chlorophyll or chromule is a green substance, which forms flakes of a gelatinous consistence floating in the colourless liquid of the cells ; these flakes have a tendency to gather around or collect on the inner cell-walls, or on the contained starch or aleurone grains. Chlorophyll constitutes the green colour of plants ; it is dissolved by alcohol, whence it has been supposed to be of a resinous nature. The yellow colouring matter of cells is similar in consistence and properties to chlorophyll ; but red, violet, or blue colouring matters are always liquid. Aleurone abounds in ripe seeds, and is always found either in the embryo or albumen. Hartig considers an aleurone grain to be a vesicle with a double membrane, containing a colourless waxy mass, which is coloured yellow by iodine, and is ordinarily soluble in water. In certain plants it assumes a well-defined crystalline form (figs. 674, 675) ; in others, the nucleus of the aleurone mass has crystal- lized, while the surrounding layers remain amorphous, and thus the grain presents a round or ovoid form. Aleurone is essentially • formed of substances which are collectively termed protein (for which see the section on Vegetable Physiology). According to Hartig, the particles of the nucleus undergo the following transformations : 1, the nucleus is transformed directly into chlorophyll, fecula, or aleurone ; 2, it is transformed into starch and the starch into aleurone ; 3, it is transformed into chlorophyll, and that into starch, which again passes into aleurone. The laticiferous vessels contain a large quantity of powdery granules, which float in the latex, some of which are very large and colourless, and partake of the nature of starch. As to the sap which fills these cells, and rises in the vessels, it is a colourless liquid, holding in solution the materials for cell-formation and cell-contents. The other liquids, either contained in the cells, or in the intercellular spaces, are fixed or volatile oils, turpentines, sugar or gum, dissolved in water. Finally, we find gases occupying the intercellular spaces, sometimes at considerable depths. Besides the solid organic substances above described as occurring in the cellular tissue, special cells occur, containing mineral substances, the elements of which, either compound or simple, have been carried up by the sap, and have cry- stallized in the cells. Those of which the elements were originally in combination 674. l.;it lirii :l. Cell containing crystals of aleurone, in the midst of cells containing chlo- rophyll. 673. Rumcx. Cells containing raphides. ELEMENTARY OKGANS. 121 would crystallize at once ; but for the others, it is necessary that the elements which have a reciprocal affinity should be united in proper proportions. In all cases, it is only during life that this crystallization is carried on, for the crystals are found in special cellular tissues, the forms of which determine theirs ; the same salt being, in fact, found to crystallize very differently according to the tissues in which it is formed. The crystals contained in the cells are either solitary or clustered ; in the latter case they are grouped into radiating masses (fig. 672), or bundles of parallel needles (fig. 673) named raphides (R); and they may often be seen escaping from the cells (c) when the tissue containing them is dissected under the microscope. Finally, the cells and even the intercellular spaces often contain silex, one of the most abundant of minerals, which constitutes sand and flint; this silex even encrusts the tissues of certain plants, and notably the straw of Graminece. Certain mineral concretions are observable in the leaves of some Urticew ; if the leaf of a Nettle be viewed with a lens, transparent spots may be distinguished ; this is due to the presence of calcareous particles deposited in the outer cells, to which Weddell has given the name of cystoliths. These cystoliths differ from the crystals represented in fig. 672, in being deposited in calcareous layers around a nucleus formed at the expense of the cell-wall, which has been pulled aside by the accumulation of mineral matter, and has lengthened into a very delicate pedicel from which the cystolith is suspended. This formation may be compared with that of stalactites. Epidermis. — Before treating of the anatomy of the fundamental organs, we shall describe the epidermis, which covers the surface of the vegetable. If the leaf of a Lily or Iris be torn, a shred of transpa- rent colourless membrane is detached from one of the fragments, together with some cellular tissue, filled with green chlorophyll; a simple lens shows on this membrane several parallel (fig. 676) or reticulate lines (fig. 677) and small, more opaque spots. Under a microscope, it is seen to be com- posed of large flat cells, which may be hexagonal or quadrilateral, or irregularly waved, and which contain a colourless liquid ; their lateral walls are closely united, whence the solidity of the epider- mis ; their lower surface slightly adheres to the subjacent cellular tissue; their exposed walls are usually thicker than the others, and may be flat or raised in the centre, according as the surface of the epidermis is smooth or rough. In most cases, the epidermis is composed of a single layer of cells ; when there is a second, it is usually formed of much smaller cells. The lateral walls of all the epidermal cells are not contiguous ; many of them present interspaces, occupied by little bodies resembling a button-hole with a double rim or border (figs. 676, 677), st 676. Lily. Epidermis and stomata. 677. Balsam. Epidermis and stomata. 122 ANATOMY. formed of two curved cells whose concavities face each other. These two small lip- like cells are termed stomata. Stomata, though epidermal org?/ns, differ from the epidermis in that their cells are much smaller, and nearly always situated below those of the epidermis ; they further present different contents, and especially granules of chlorophyll ; whence they may be regarded as intermediate between the epidermis and the subjacent parenchyma. Stomata are variously distributed over the surface of the leaves : usually solitary, often arranged in series, some- times crowded in the base of a cavity (as in some Proteacece, figs. 678, 679). Their number varies : the Iris contains 12,000 in a square inch; the Pink, 40,000; the Lilac, 120,000. When moistened, their lipS SWell and become 679. Part of a Banksia leaf, presenting three sections more curved, and hence gape ; parallel to the lower snr- 3 r ' face, and at different when dry, they shorten and dePths (mag.).° close. Stomata always correspond to intercellular passages, and are found on the ordinary leaves of Phamogams, principally on their lower surface, on stipules, on P_ ^ herbaceous bark, calyces, and ovaries ; they are wanting on roots, rhizomes, non- foliaceous petioles, most petals, and seeds ; ncotyledons, and submerged aquatic plants, which have no epidermis, equally want stomata. If a fragment of a stem or leaf be macerated, the cellular tissue beneath the epidermis is rapidly destroyed, and the latter divides into two layers, an external epidermis proper, and a very thin membrane (fig. 680), moulded on the epidermis and extending even over its hairs, which are sheathed in it like fingers in a, glove (P) ; it presents openings (P) corresponding to the stomata. Brongniart has called this membrane the cuticle (little skin] ; it is not cellular, like the epidermis which it covers. 678. Vertical section of part of a Banksia leaf (mug.)'1 «80. Cabbage. Cuticle. 1 Fig. 678 is a section perpendicular to the thickness of the leaf, showing : 1, on the upper and lower faces two layers of epidermal cells ; 2, fibro-vascular bundles to the right and left, cut perpendicularly to their length ; 3, on the lower face, a depression, clothed with hairs, and pierced by stomata which communicate with the interstices of a very loose cellular tissue. Above this tissue, the upper half is a mass of elongated and erect cells, perpendicular to the epidermis. * Fig. 679. Three sections parallel to the plane of the leaf, carried through three such depressions, each circum • scribed by the fibro-vascular bundles of the nerves. In the cavity at the bottom of the figure, the section has carried away the hairs clothing the walls of the depres- sion, leaving the stomata and epidermal cells visible ; in the cavity on the right the loose cellular tissue which underlies the stomata of the epidermis is seen through the latter ; in the third depression the section has re- moved all but this subjacent tissue with its intercellular FUNDAMENTAL OBGANS. 123 The cuticle is more constantly present than the epidermis ; submerged plants and acotyledons are clothed in it ; and some botanists have considered that it should be regarded as the true epidermis. Its formation is attributed to the overflow of that intercellular secretive -tissue which we have already spoken of as spreading itself upon all the organs, and which deposits a sort of varnish or continuous layer over their outer surface* Becent experiments of Fremy seem to show that the chemical composition of the cuticle is analogous to that of india-rubber, which makes it a suitable protection for the underlying tissues. Fremy has also discovered that woody fibre is sometimes clothed with a cuticle similar to that which clothes the epidermis. FUNDAMENTAL ORGANS. We shall now describe the anatomy of the fundamental organs in succession ; i.e. the vegetable axis (stem and root), and its lateral expansions (leaves, sepals, petals, stamens, carpels, ovules). We have described the embryo as a diminutive plant, from which all the parts enumerated above will be developed ; we must there- fore first describe its structure, and then trace its stages of development from its birth till it becomes a plant similar to its parent. The embryo invariably commences as a cell with granular contents. In cotyle- donous plants, this cell does not retain its form arid structure ; from spherical it becomes oval ; then at one of the extremities, if the plant is monocotyledonous, a rounded lobe (cotyledon) appears, obliquely and laterally to the axis ; if dicotyle- donous, two lateral lobes (cotyledons) appear, crowning the axis ; the elongated summit of the axis becomes the plumule ; from the opposite end the radicle will be developed, and the body of the cellular mass will form the caulide. Following the growth of these fundamental organs, we begin with the stem, which differs remark- ably, according to whether the embryo is mono- or di-cotyledonous. Stem of Dicotyledonous Plants. — Take the Melon as a type. In the caulicle, which before germination is entirely cellular, some cells elongate into fibres ; certain of these fibres, together with other super- imposed cells, break the transverse walls which separated them, a,nd become vessels. This change takes place in definite posi- tions, and a horizontal section of the stem (fig. 681) will show in the centre a disk (M) of large, loose, nearly transparent polyhedral or spheroidal cells ; at the circumference, a ring of dark green, more closely packed cells ; communication being established between this ring and the disk by radiating 6g] ^elon bands of cells (EM), extending from the centre to the cir- Homontauiice of the stem cu inference, and dilating in the same direction ; the whole resembling a wheel, of which the tire is the circle, the axle the central disk, and the spokes the radiating bands. Between the disk and the circle, and separated by the bands, are wedge-shaped plates, which together form a circular group, and consist of fibro-vascular tissue, and vessels which have been formed in the middle of the cellular mass, arid become united into bundles. The gaping 124 ANATOMY. mouths of these vessels and fibres are very evident, as is the .relative thickness of their walls : we shall return to this immediately. The cellular tissue of the ring, disk, and bands, constitutes the medullary system. The medullary system of the disk (M) is called the pith ; that of the ring is the cortical pith ; and the radiating cellular bands (EM) are the medullary rays. The wedges of fibres and vessels, separated by the rays, are the fibro-vascular system. If we now dissect one of the bundles in a well-formed stem of Melon, whose duration is annual (fig. 682), it is found to be tolerably stout, and completely surrounded by the cellular tissue, the pith (M), bark (PC), and medullary rays (EM). Beginning from the interior, we find, 1, spiral vessels (T), and opaque white fibres with thick walls; 2, fibres (F) with thinner walls, and consequently larger cavities, arranged in series, and altogether occupying half of the wedge ; together with annular, rayed, and dotted vessels (v p), recognizable, especially the latter, by the size of their walls ; 8, a greenish cellular tissue (c) ; 4, thick-walled fibres (L) like those next the pith, but more abundant ; 5, some branching (laticiferous) vessels (v L) with soft walls ; 6, the cortical paren- chyma (PC), covered by a membrane (E) consisting of the epidermis and cuticle. In a horizontal section of the stem (fig. 681), the tracheae (T) and fibres next the pith form with the neighbouring vessels a ring (interrupted by the medullary rays), which has received the collective name of medullary sheath ; the fibres outside this sheath are the woody fibres ; the outer fibres, separated from the former by a cellular zone, and resembling those of the medullary sheath, are the woody fibres of the bark ; finally, the cellular zone which separates the cortical from the woody fibres is called the cambium layer. In 683 Mapie. the Melon, this zone dies each year, together with 5g3^£l±it1^T»£ the fibro-vascular bundle, which it divides into two «"•« unequal parts ; but in a woody-stemmed, and hence perennial plant (Oak, Elder), fresh layers are annually formed in the thickness of this zone, by which the thickness^f the stem increases. Young branches, therefore, one or two years old or more, must be examined, to trace the further development of the wood and bark. A fibro-vascular bundle in a one-year-old branch of Oak, Elder, or Maple (fig. 683), coincides in structure with that of the Melon stem ; but in the cortical system (P c) there will be found, between the epidermis and central layer of cells, a layer of close-set cubical or tabular cells (s) ; these contain no chlorophyll, are white or brown, and are readily distinguishable from the subjacent cortical cells, which are polyhedral, coloured by green granules, and separated by numerous interstices. This FUNDAMENTAL OEGANS. 125 layer is the suber, which in certain trees attains a considerable development, and forms cork. Take now a vertical section of the same branch, and the disposition, &c. of the fibres and vessels will appear as in fig. 683. The cambium, which does not become organized in annual or herbaceous stems like the Melon, in perennial stems becomes highly organized (fig. 684). During the second year, this gelatinous tissue undergoes the following changes : outside the woody P. L. P. L . P .L.MC. C . F . V . F , V.F.V.T.M. 684. Maple. Horizontal slice, showing the development of a woody bundle in a three- year-old branch, c, cambium layer, separating the wood from the bark. 1. Pith (M), tracheae (T), punctate vessels and fibres of the first year (v).— 2. Punctate vessels (v) and fibres (F) of the second year. — 3. Vessels (Y) and fibres of the third year. Within the bark (s) is seen the cortical layer of the first year (p. L), then that of the second year (P. L), and of the third year (p. L), separated by the cambium (c) from the contemporaneous \voo;ly layer (mag.). 685. Oak. Horizontal slice of a twenty-five years' old trunk. fibres interspersed with large vessels (1. v), is formed one fresh cambium layer (2. F, v) ; within the fibres of the liber and of the cortical system another is formed ; these layers become moulded upon the older ones, and the zone of cambium which is transformed to produce them presents a cellular organization at those points, which corresponds to the cells of the medullary rays, so that these continue without interruption from the pith to the cortical layers. Each ring of vascular bundles was hence from its earliest condition enclosed in two cambium layers, of which one belongs to the wood, the other to the bark ; each of these vascular bundles, again, is in its turn separated by a cambium layer, which in the third year repeats the process, producing within ligneous fibres (3. F) and large vessels (3. v), and outside liber (L) and cortical parenchyma (p), and so on each year. Now, each wood bundle being composed of two elements, and the large- sized vessels being usually towards the interior of the bundle, we can, by counting their number (which is easily ascertained by the gaping mouths of the large vessels), reckon the number of annual layers, or, in a word, the age of the stem or branch (fig. 685). It must be remarked that the secondary ligneous bundles differ from the primary in the total absence of tracheae ; these vessels being confined to the medullary sheath. We have said that the medullary rays are not interrupted by the formation of new vascular bundles, because the cambium zone remains cellular at the points corresponding to these rays. If each newly formed bundle was undivided, like that in juxtaposition with it, the number of medullary rays would be always the same ; but this is not the case ; at the circumference of the primitive bundle one or more longitudinal series of cells is developed, which reach to the circumference, and 126 ANATOMY. M 686. Cork Oak. Horizontal slice showing the development of two woody bundles in a four-year-old branch (mag.)- divide the new bundle into two or three parts (fig. 686). These celVilar rays (2, 8, 4), which are termed secondary medullary rays, to distinguish them from the primary (1), which start from the pith (M), are thus doubled in each annual ring, and, like the large rays between the h'bro- vascular vessels, form a sort of vertical septa or radiating walls, com- posed of elongated and super- imposed cells ; whence the name of muriform tissue for the me- dullary rays. j/j Hence, in its totality the stem presents two very distinct systems, the woody (wood), and the cortical (bark). 1. The woody system is formed of the central pith and zones of fibre-vascular bundles, sepa- rated by medullary rays. The innermost of these is the medullary sheath, formed of tracheae and fibres analogous to the liber, and c outwardly composed of woody fibres and rayed, annular, and dotted vessels. The other zones are similarly organized, except that they, never possess tracheae. 2. The bark system is formed of the epidermis, the cork, the endophleum, and the bast fibres (liber), external to and amongst which the laticiferous vessels ramify. With age the cells of the pith lose colour, dry, separate, and finally die ; the woody fibres thicken, and usually darken ; of these the heart- wood (duramen) differs from the more recently formed or sap-wood, which is more watery, softer, and brighter coloured. The liber fibres (fig. 686 bis) are more sfender, longer, and more tenacious than the woody fibres ; and are of great use in the manufacture of thread, cord, and textiles. Their bundles descend vertically and rectilinearly in thin concentric plates, whence their name liber (book) j but in some plants, as the Oak and Lime, they form a network, the interstices of which are occupied by the medullary rays. From the mode of development of the wood and bark systems, it is obvious that the wood must harden, and the bark decay ; for in all the bark tissues, the later formed are constantly pushing towards the periphery, within which they have been developed ; this produces the exfoliation of the several elements of the cortical sys- tem ; the epidermis first, then the cork-cells, the endophleum, and sometimes the liber. It is not necessary to describe any of those anomalous dicotyledonous stems which present peculiar tissues or hyper-development of certain elements, or the absence of others ; except that of Conifers (Pine, Fir, Larch, Yew, &c.), the wood of which, with the exception of a few tracheae in the medullary sheath, is entirely com- posed of regularly dotted fibres. The walls of these wood-fibres (fig. 687) are hollowed into small cups, like watch-glasses, which are arranged in two straight lines, occupying the opposite sides of each fibre. These cups are so placed in con- tiguity that their concavities correspond (fig. 688), leaving an interposed lens-like FUNDAMENTAL OEGANS. 127 space. The dot is placed in the centre of each cup (and corresponds to a thinned portion resulting from the absence of the inner membranes) ; from this thin portion there proceeds, on the convexity of each cup, a short canal, with only one opening, which leads into the interior of the fibre. The lens-shaped cavity arising from the contact of two fibres is usually filled with resin (turpentine], which infiltrates into the cavity of the fibres and destroys them by degrees; the result is those resinous deposits which are often found A occupying large cavities in the wood of conifers (fig. 689, la}. P.C. c.f V 688. Pine. Vertical section of the stem (mag.), p. f, fibre wall ; c. 1, lenticular cavity ; r. m, medullary ray ; c. f, cavity in a fibre. 687. Pine. Punctate fibre (mag.). 689. Pine. Horizontal slice showing the development of two woody bundles in a three-year-old branch (mag.). V.L.. Steins of Monocotyledons. — When the monocotyledonous embryo, which is entirely cellular before germination, begins to elongate, fibro- vascular bundles form in its stem. These are at first arranged in a ring as in young dicotyledons; but soon, as the leaves develop, the bundles multiply without any apparent order in the cellular tissue, becoming more numerous and close as they approach the circumference of the stem. If a fully developed bundle be examined under the microscope (fig. 690), it is found to be structurally identical with that of a dicotyledon ; beginning from the central pith, we find walled fibres analogous to liber (L), then tracheae (T), then, mixed with cells (p), some of which elongate and thicken into fibres, are seen the openings of rayed or dotted vessels (v) : the circumference of the bundle is formed of thick- walled fibres (liber, L), outside of and amongst which the fi90. Transverse section of a fibro- T !• -r> i •{• / \ vascular bundle of a monocoty- latlClierOUS V6SSels ramify (V.L). But, though individual bundles resemble those of a first year's dicotyledonous stem, when taken all together they pre- sent a very important difference (fig. 691), in not being grouped in concentric zones but 691. Palm. Horizontal slice of the stem. &$*£* "the 128 ANATOMY. (F) remaining isolated and scattered through the medullary system (M) without any medullary rays of muriform tissue. Here there is no symmetrical arrangement ; the bundles are scattered throughout the pith, and may multiply without being impeded by lateral pressure ; further, each remains simple ; at no period does it develop between its bark and wood systems a layer of cambium destined to form new bundles. In dicotyledons, on the contrary, the bundles are pressed into zones from the first year, and their wcod and bark systems being concentric, they can only multiply by fresh wood and bark bundles being formed between them. The consequence of this arrangement of the fibro- vascular bundles is, that in dicotyledons the stem is hardest towards the centre, whilst in monocotyledons the stem is hardest towards the circum- ference; as is very apparent in the woody (fig. 692), and even in the herbaceous stems of monocotyledons. In a longitudinal section of a woody (fig. 693) or herbaceous (fig. 694) monocotyledonous stem, those differences are still more apparent ; starting from the insertion of a leaf, each bundle descends at first obliquely inwards, then vertically, then again obliquely outwards ; cros- sing in its path all the bundles which have origi- nated below it, and are hence older than itself, and ending by taking up a 693. Theoretical section of a position Outside of them stem c»* Palni stem. * _. , , - vertically. all. In dicotyledons also, the youngest bundles are the outermost, those of the same age follow nearly parallel ; but whereas in their courses they unite so as to form a cylinder, in monocotyledons they diverge below and converge above. The composition of mono- cotyledonous bundles also differs in different parts of their course, the wood system predominating over the cortical in the upper part, where it descends obliquely inwards, the cortical system predominating in the lower part, where it descends obliquely outwards, and finally the cortical system alone being developed where the bundle reaches the periphery. Here the bundle becomes more slender, and divides into thread-like branches, which interlace with those of the neighbouring bundles, and form together, within the cellular periphery, a layer of fibres comparable, according to many botanists, with a liber zone. It is obvious that these fibro-vascular bundles, being composed of different elements at different heights, and becoming so slender towards the periphery, must appear very dissimilar in a horizontal cut of the stem ; the scattered small bundles with large vessels, which occupy the middle of the stem, are the upper portions of bundles in which that which we have called the wood system (though it is rather 692. Palm. Stem cut vertically. FUNDAMENTAL ORGANS. 123 cellular and vascular than fibrous) predominates. The coloured and dense bundles, which form a more solid zone towards the periphery, are the lower portions of bundles in which fibres analogous to liber predominate ; and, finally, the less compressed bundles which are usually seen outside of the coloured zone are these same fibres after having branched and spread out, and before being lost in the periphery, which is a cellular zone representing the bark. A monocotyledonous stem usually retains about the same diameter throughout. This is because the fibro-vascular bundles, gradually attenuated towards their lower extremity, do not, as in dicotyledons, unite and descend to the bottom of the stem ; hence, any two truncheons of a monocotyledonous stem, being equally rich in bundles, can differ but little in diameter. Eoot. — In the embryo, the radicle is the simple cellular lower end of the caulicle, which elongates downwards as the latter ascends with its plumule and cotyledons. A monocotyledonous seed usually presents several radicles (fig. 642) ; these are not, however, naked like those of dicotyledons, but are originally enveloped in an outer layer (serving as bark), which they push forward and pierce, emerging from it as from a sheath; whence the name of coleorhiza for this organ (fig. 642). Examples have been given of stems emitting accessory or adventitious roots from various parts of their surface ; the structure of these is precisely the same as that of the radicle ;. and they may even be regarded as identical, the radicle being con- sidered as a production of the caulicle, and all roots, whether primary or secondary, as adventitious. In its earliest stage the root presents an axis of densely „ packed cells ; the central of these elongate and form vessels which interlace with those of the stem (fig. 695). The root may be simple or branched, but its branches do not start from the axil of a leaf, and are not regularly arranged, like the shoots of c the ascending axis. They terminate in fibrils, together called root-fibres, which decay, and are replaced by fresh ones which usually spring from near the base of the youngest branch. Like the stem, the root-branches and fibres are clothed with an epidermis or cuticle, except at the tips, which some botanists call spongioles (SP). The root elongates at the tips of its branches, but not of its root-fibres, which are caducous ; and as the fresh cells of the root-branches are at first deprived of SP_. epidermis, it is supposed that roots absorb moisture from the soil by these, as well as by their root-fibres. The fibrous and vascular tissues of roots are the same as those of stems, but no trachese are ever found in them; the cells are distended with juice or filled with fecula (Orchis, fig. 695). In dicotyledons, the root is distinguished from the stem by the absence of pith and medullary sheath, and by its axis being occupied by woody fibres ; there is scarcely an exception to this. Its diameter increases, like that of the stem, by the annual C 695. Orchis. Vertical section of a rootlet, much enlarged. The cells (c,c) become gradually organ- 130 ANATOMY. PC ST formation of two concentric zones between the wood and bark ; it elongates at its extremity only, while the stem and its branches elongate throughout their length ; this may easily be proved by marking off an inch of a root and an inch of a stem. Monocotyledons, instead of having a tap-root (i.e. one main axis which branches), usually emit compound roots, i.e. composed of simple or slightly branched bundles, rising from the neck. Their anatomical structure is exactly similar to that of stems. Leaves. — The anatomical structure of leaves is the same as that of the stem ; they consist of a fibro-vascular bundle and parenchyma; this bundle, which is wholly formed before leaving the stem, spreads into a blade as it emerges (sessile leaf), or remains undivided for a certain distance before expanding (petiolate leaf) ; the nerves of the blade are formed of fibres and vessels ; both it and the petiole are covered with a layer of epidermis bearing stomata on every part except the nerves and petiole. The petiole, before expanding, often forms a sheath or stipules ; 'the sheath exists when the partial bundles of which it is composed separate from each other, but without diverging; the stipules are the result of the diverg- ence of the lateral bundles of the petiole.1 Where the fibro-vas- cular bundle (fig. 696, FV) leaves the stem to form the petiole (F), the fibres composing it are shortened, and narrowed at each end, whence their surfaces Of uppcr ePillernii8 ; E '• Iower cpidermi8- contact are contracted ; they are hence not solidly united at the point of emergence ; and it is this defective cohesion which causes the fall of most leaves. The stem presents a little swelling at the base of the petiole, called the cushion (c), which is visible after the disconnection of the petiole (fig. 54), together with the scar (F) left by the petiole. The relative position of the elements of the fibro-vascular bundle which passes from the stem into the leaf, shows clearly that the leaf-blade may be compared to a flattened stem, the fibres and vessels of which have been spread out, and thus allowed plenty of room for the development of parenchyma between their ramifications. As in the stem the fibro-vascular bundle consists of tracheae in the centre, then rayed or dotted vessels and woody fibres, and on the outside laticiferous vessels and thick-walled liber-fibres, so in the leaf- blade each nerve (which is a partial bundle) presents tracheae on its upper surface, rayed or dotted vessels with woody fibre on its lower surface, and laticiferous PC FV M Branch cut vertically, Ri 697. Melon. This theory of the origin and development of stipules requires considerable modification. — ED. FUNDAMENTAL ORGANS. 131 vessels and liber-fibres. The lower surface of the leaf, which corresponds to the cortical system, is generally more hairy and presents more stomata than the upper, which corresponds to the wood system. The parenchyma of the leaf, filled with green chlorophyll, usually presents (fig. 697), in flat leaves, two well-marked divisions ; the upper, belonging to the woody system, consists of one or more series of oblong cells (P.S), arranged perpendicularly side by side beneath the epidermis (E.S), leaving very small interspaces (M) ; the lower division, belonging to the cortical system, consists of irregular cells (p.i), with interspaces (L) corresponding with the stomata. The parenchyma of fleshy leaves (as 8edum) consists of cells with few interspaces, which cells become poorer in chlorophyll towards the centre of the leaf. Submerged leaves (fig. 698) have no epidermis, stomata, fibres, or vessels ; their parenchyma is reduced to elongated cells, arranged in few series, and is consequently very permeable by water. The leaf originates as a small cellular tumour, which afterwards dilates into a blade, the cells on the median line of which elongate and form fibres, then, as in the stein, first tracheae, and lastly other vessels. In his treatise ' On ~the Formation of Leaves,' Trecul admits four principal types according to which these organs are formed : the basifuqal, basipetaL mixed, and parallel. J y. ' * ' . ' r COS. Potamogeton. In the l>a,sifuqal, the leaf IS developed from Section perpendicular to the surface of a leaf (mag.). '- , P, parenchyma without epidermis ; V, interstices. below upwards, i.e. the oldest parts are those at the base of the leaf, and the tip is the last part formed ; the stipules appear before the leaflets and secondary nerves of the leaf. In the basipetal type, the rachis or axis of the leaf appears first, and on its sides the lobes and leaflets spring from above downwards ; the tip is hence developed before the base. The stipules are developed before the lowest leaflets, and sometimes even before the upper. In this type, not only the leaflets, but their secondary nerves and teeth, appear in succession downwards. In the mixed arrangement, both these types are followed. In the parallel type the nerves are all formed in parallel lines, but the sheath appears first. The elongation of the leaf takes place at the base of the blade, or base of the petiole. The sheath, although the first formed, does not increase till the leaf has developed to a certain extent. The nerves of leaves are arranged very differently in monocotyledons and dicoty- ledons. In the former (fig. 33), they are usually simple, or, if branched, the branches do not inosculate. In dicotyledons, on the contrary (fig. 6), the nerves branch into veins and venules, which inosculate with those of the neighbouring nerves, and form a fibro-vascular network of which the interstices are filled with parenchyma. Nevertheless, in some monocotyledons, the basal nerves are not all parallel and simple ; but secondary nerves spring from one or more of the principal nerves, and diverge in other directions ; but these secondary nerves are parallel, and the con- vexity of the arc which they describe is turned towards the principal nerve (this nervation is rare among dicotyledons) ; lastly, t.ie nerves in monocotyledons may K 2 132 ANATOMY. anastomose into a network, and the blade, instead of being entire, as is usual in this class, may be lobed (Arum). On the other hand, some dicotyledons occur with parallel and simple nerves; but these exceptions do not invalidate the general rule indicated above. In all cases of determining the class of a plant, the examination of the nerves must be supplemented by that of the fibre-vascular bundles of the stem, which are symmetrically arranged in dicotyledons (fig. 685) ; and dispersed without order, though more closely packed towards the circumference, in monocoty- ledons (fig. C91). Buds. — The bud (fig. 096, B) appears at first under the bark as a cellular point continuous with the extremity of a medullary ray ; it soon pushes through the bark, and forms a tumour on the stem, when its cellular tissue becomes organized into fibres and vessels communicating with those of the stem ; the medullary sheath, however, of the young branch is closed at first, and does not communicate with the medullary ray of the axis from which it emanates. Sepals. — The anatomical structure of these organs completes the analogy between them and leaves. The nerves of the sepals are bundles of tracheae and fibres, parenchyma is spread out between them, and their surfaces are covered by an epidermis, of which the upper presents more stomata than the lower. As with the leaves, the nerves of the sepals are usually parallel and simple in monocotyledons, branched and anastomosing in dicotyledons. The sepals first appear as small cellular papillae, connected at the base by an annular disk referable to the recep- tacle : their tips are free in both the monosepalous and polysepalous calyx ; it is only later that the calycinal tube appears. Vascular bundles are gradually formed in the sepals as in the leaves. Petals. — The corolline leaves have often, like ordinary leaves, a petiole, which is called the claw. When this is present, the fibro-vascular bundles traverse its entire length, and only separate to form the nerves of the blade; these nerves, usually dichotomous, are composed of tracheae and elongated cells ; the parenchyma which fills their interstices is formed of a few layers of cells, covered by an epidermis presenting very few stomata on the upper surface only, or none at all. Very young petals, like sepals, appear as cellular papilla) ; but in petals these soon dilate, and form dark or light- green disks, which at a later period always change colour. Although the petals are placed below the stamens on the floral axis, they generally expand later, as if they had been developed later, which is not the case. In a monopetalous corolla, the torus is raised above its ordinary level so as to form a little circular cushion which connects the leaves to which it gave birth, and the segments of the corolla appear as projections upon this cushion. Finally, whether the corolla be monopetalous or polypetalous, its petals are developed like ordinary leaves ; the tip and base are first formed, and the develop- ment takes place towards the central veins from below upwards, from above down- wards, and laterally. Stamens. — The complete stamen consists of filament, connective, anther, andpo/Zen : FUNDAMENTAL OEGANS. 133 let us examine their structure in the adult, and their mode of development in the young stamen. The filament consists of a central bundle of trachese which traverses its length, of a layer of cells enveloping this bundle, and of a thin superficial epidermis. The connective, which is the continuation of the filament, is formed of cells of the con- sistence of glandular tissue, in which the bundle of tracheae terminates. The anther is usually divided into two cavities, separated by the connective, and containing the pollen. The walls of these cells consist of an outer or epidermal layer of cells (fig. 699, CE) with many stomata, and of an inner simple or multiple layer of fibrous (E), annular, spiral, or CE — reticulated cells ; this layer becomes thinner as it approaches the line of dehiscence of the anther, where it ends. At the period of dehis- Bemamsof the'nbrous cence the outer membrane of these cells is destroyed, and the little dermis of the anther netted, ringed, or spiral bands which lined it alone enclose the pollen, the emission of which they assist when they dry up, contract, and separate the valves of the anther. The young stamen appears as a cellular green papilla, which usually turns yellow. The anther is the first formed ; it presents a median furrow (the connective) , and two lateral ones (the future lines of dehiscence) ; the filament appears next, at first wholly cellular, then traversed by a bundle of tracheae. The tissue of the anther is at first a uniform cellular mass (fig. 700), in the middle of which a certain number of cells are absorbed and leave usually four spaces, which gradually enlarge and form as many cavities, nearly equidistant from the centre and the periphery. Each pair of these small cavities eventually represents an entire cell (fig. 701). All these four CL Cl CM CE C.I c.E CE C.i CM 700. Melon. Vertical section of young anther (mag.), showing the epidermal cells (CE), and the inner cells (ci), all alike and homoge- neous, in the middle of which spaces will form. 701. Melon. Vertical section of an anther- cell (mag.) with two cellules. CE, epidermal cells; c I, inner cells ; c M, mother-cells con- tained in the cellules. 702. Melon. Vertical section of an anther-cell where the cellules are filled with mother-cells, c L, walls of the cellules (mag.). CM-/ P. 703. Melon. Mother • cells (c M), originally hexagonal, of which the septa are destroyed, and con- taining each four pollen - grains (p) (mag.). cavities gradually fill with mucilage, out of which are elaborated two forms of cellular tissue, one of small cells (fig. 702, CL) that line the cavity, the other of large cells (CM) that fill the cavity, and within which the pollen is developed. The latter, called mother-cells (CM), soon become filled with a fluid full of granules; the granules again aggregate, and form four nuclei floating in the liquid, which thickens by degrees from without inwards, and finally forms four septa dividing the mother-cells into as many cellules. Each, nucleus then becomes coated with a membrane (fig. 134 ANATOMY. 703), after which both the septa and the walls of the mother-cells disappear, and the four nuclei (P) which filled them are set free as pollen-grains (fig. 704). As they grow (figs. 705 and 706), the cellular tissue of the anther, in the middle of which the cavities had been formed, are absorbed ; a layer of cells which formed the walls of the cavities now lines the membrane of the epidermis (fig. 699, CE), and rapidly changes into a layer of fibrous cells (E) ; the tissue which sepa- rated the small cavities becomes gradually thinner, and forms a septum which projects from the connective towards the line of dehiscence ; this septum is soon destroyed, and the two cavities form but one (anther-cell). In some plants this septum is persistent, and the anther remains quadrilocular (Butomus, fig. 326). In many plants the remains of the mother- cells only partially disappear, and the rest connect the pollen-grains, as in Orchis (figs. 359 and 360), where an elastic network causes them to cohere in small masses. Carpels. — The anatomy of the carpellary leaves is analogous to that of ordinary 701. Melon. Young pollen-grains, free (mag.). 705. Melon. Nearly adult pollen (mag.). 707. Tear. Very young Bower, cut vertically to show tlic petals, stamens mid carpel- lary mamma; free on the receptacle (mag.). ?08. Pear. Young carpels, seen from within, at first concave, and the edpes afterwards approaching to form the st>le and placenta* (mag.j. 709. Tear. Young flower, cut vertically to show the growth of the receptacle, the arrangemen'; of the carpels, and the inser- tion of tlit- petals and stamens (mag.). 711. Pear. Mower cat vertically, with the stamens and petals removed, show- ing the carpels enveloped by the receptacular cup (mag.). leaves ; a cellular tissue (sometimes very succulent, as in berries and drupes), traversed by fibro-vascular bundles, is covered with an epidermis, the outer surface only of which bears stomata ; the bundles ascend from the ovary into the style, occupying its circumference, its centre being hollowed into a canal. The inner walls of this canal, which is formed by the convolution of the upper end of the carpellary leaf, is covered with projecting cells, and its axis is occupied by soft cellular filaments, named conducting tissue ; it is this tissue which constitutes, on the top or sides of the style, the true stigmatic tissue. The placenta, which transmits moved,8 to* show* tiie nourishment to the seed, and the funicle, which is a prolongation the rweptncii'iar cup of the placenta, consist of a bundle of tracheae surrounded by elongated cells. Inferior ovaries have the carpels encased in a receptacular cup, which is some- 710. rear. (mag.). FUNDAMENTAL ORGANS. LnA times enormously hypertrophied, especially in Rosacece and Pomacece (figs. 707 to 711), and bears on the top the stamens, petals, and calyx. Ovule. — Botanists often apply this name to the undeveloped seed ; but, to be precise, they ought to confine it to the unfertilized seed. To trace the development of the ovule, it must be examined long before the bud opens : it then appears as a papilla on the placenta, called the nucleus (fig. 712) ; around the base of the nucleus (fig. 713) a circular ring is formed (s), which at first grows at the same rate as itself, but, rising on its surface, it eventually overtops and finally almost entirely envelops the nucleus ; but before this takes place, a second circular ring is developed (fig. 714, p) outside the first (s), which follows it in its growth, and ends by reaching and overtopping it ; the nucleus (N) is hence enclosed in two sacs, whose mouths are contracted, and on a level with its top, thus forming a little cylindrical or cup-shaped cavity, consisting of two superimposed rings touching at all points of their circumference. The upper opening, belonging to the outer coat, is named exostome (Ex) ; the lower, belonging to the inner coat, is named en- dostome (End). The union of the endostome and ex- ostome constitutes the micropyle, which always corresponds to the top of the nucleus. The outer coat is called the primine (p), the inner the secundine (s) ; the nucleus (N) has also been called the tercine ; terms which refer to their order of superposition from without inwards, not that of development. The fuuicle (p) is inserted on the primine, and its contained bundle of tracheae, after traversing the primine and secundine, expands at the base of the nucleus into a swollen coloured cellular tissue, termed chalaza, opposite to which there is almost always a corresponding swelling on the primine. As the ovule, which is wholly composed of cellular tissue, grows, a cavity is formed near the centre (fig. 715) of the nucleus, by the dilatation of one of its cells; this cavity, which extends through the length of the nucleus, and adheres by its two ends to the neighbouring cells, is the embryonic sac (S.E), or quintine. Its walls shortly become lined with a mucilaginous cellular tissue, developed from the circum- ference towards the centre, which fills the cavity of the sac ; this tissue, together with that of the nucleus, constitutes the alimentary deposit destined for the embryo, and is called albumen (perispermum). The ovule, thus organized before fertilization, undergoes one of the three following changes : — most frequently the embryonic sac pushes away the nucleus on all sides, and its own parenchyma alone is developed, when the albumen is more or less fleshy ; sometimes, on the contrary, the nucleus presses upon the embryonic sac, and reduces it to a narrow tube, when the albumen is farinaceous ; sometimes, again, the action is reciprocal, and two kinds of albumen result, — the white Nymphcea (figs. 610, 647) affords a remarkable instance of this. For this reason Gaertner, comparing the ovule with a bird's egg, limited the term 712. Mistleto. Ovule (mag.). 714. Polygonum. Ovule (mag.). 715. Polygonum. Ovule cut vertically (mag.). P, primine; S, secundine ; N, nucleus ; S.E, embryonic sac. 136 ANATOMY. 71fi. Polyiroiinm. Fertilized ovule, cut vertically (mag.). stapes of development in the ovule (inag ). albumen (white of egg) to the tissue developed within the nucleus (fig. 610, N), and gave that ofvitellus (yolk of egg) to the tissue developed in the embryonic sac (S.E). Fertilization is announced by the appearance of a body (fig. 716) destined to form the embryo, suspended from or near the top of the embryonic sac (s.e). At first it consists of a vesicle (v.e), named embryonic vesicle, filled with .a granular mat- ter, in which is formed first one cell, then others, each of which bears a wjtoblast on its wall. The upper and slender portion of this vesicle (fig. 717) is the suspensor ; in the lower and swollen portion the embryo is developed ; the vesicle and its suspensor soon disappear, when the embryo develops, according x 1-j.i 'j. • xii j'-LlJ 717. Dicotyledonous rni- to whether it is monocotyledonous or dicotyledonous, i,ry... in different as we have already shown, and increases within the cavity of the ovule, which it invades by absorbing the albumen. If the albumen has solidified before the growth of the embryo, the latter remains small and takes up less room ; and the absorption of the albumen is then delayed till the period of germination. The ovule is not always provided with two coats ; sometimes the inner coat alone (secundine) is developed (Walnut, fig. 713) ; in others the nucleus remains naked (Santalacca-, Mistleto, fig. 712). It is important to understand the changes the ovule may undergo before fertilization ; changes due to unequal development altering the relative posi- tions of its different parts. In theory, the hilum and chalaza correspond, and occupy the base of the ovule, the micropyle being at the top or opposite end. If the ovule develops uniformly, the arrangement is not disturbed, and the ovule is straight or orthotropous (ov. orthotropum, fig. 716), and the embryo will also be straight. In this case the position of the radicle answers to that of the micropyle, i.e. opposite the hilum and chalaza, and the embryo is said to be antitropous (ov. antitropus, Nettle, fig. 578). When the ovule develops unequally, one of two things may happen: l,the chalaza (Ch, fig. 718) may be removed from the hilum towards the position occupied by the top of the"] ovule ; which top, by a reverse movement, may be turned towards the hilum ; the axis of the ovule thus making a half turn upon itself, like a compass- needle turning from the north to the south pole. In this case the hilum not having been displaced, the vascular bundle which connects 718. Dandelion. Anntropous ovule cub vertically (mag.). 719. 720. 721. 722. Chelidonium. — Anatropous ovule in different stages of development (mag.). 723. Vertical section of fig. 722. it with the chalaza is forced to follow the latter in its revolution, and form a more or less projecting cord (E) in the thickness of the primine, named the raphe ; the ovule is then reversed or anatropous (ov. anatropum, figs. 719 to 723). Here the embryo FUNDAMENTAL OEGANS. 137 will be straight, as in the Nettle, but the . chalaza will be the antipodes of the hilum, the micropyle nearly touching the latter, and the radicle corresponding to the base of the ovule ; such an embryo is called homotropous (ov. homotropus). There are many examples of this (Sage, fig. 579 ; Chicory, fig. 580). 2. When the hilum and chalaza (figs. 724 ch, 725) are inseparable, and one side of the primine (p) is more developed than the opposite side, the one lengthens while the other remains stationary ; the resistance of the stationary side causes the lengthening side to turn around the centre of resistance ; the ovule (n) thus bent back upon itself is said to be campylotropous (ov. campylotropum) . Here the embryo will follow the curvature of the ovule, and the micropyle and chalaza (ch) being both close to the hilum, the radicle and cotyledonary ends will be only separated by the hilum, and the embryo is called amphitropous. The Wallflower (figs. 724, 725) and the Mallow (figs. 726-730) are well-marked instances of the curved ovule and amphitropous embryo. To these three types (orthotropous, anatropous, and campylotropous) all ovules properly belong ; but there are many cases of intermediate types, which it is neces- sary to take into account. In one case which, although very rare, runs through the whole family of Primulacece, and occurs in Vinca, one side of the ovule develops 724. "Wallflower. Campylotropous ovule (mag.). 725. Wallflower. Campylotropous ovule, cut vertically (mag.). 726. 727. 728. 729. Mallow. — Campylotropous ovule in various stages of development (mag.). 730. Vertical section of fig. 729. enormously, while the other gradually atrophies ; this action continues after fertilization, and the micropj^le, approaching the hilum more and more, ceases to correspond to the radicle, which may hence be variable in direction ; most commonly the axis of the embryo becomes parallel to the hilum, and the embryo is called heterotropous (ov. heterotropus, Plantain, fig. 592 ; Asparagus, fig. 594). When the seed is mature, it becomes difficult to distinguish in its coats (testa and endopleura) the primine, secundine, tercine (nucleus), and quintine (embry- onic sac), which all enter into its composition. The testa evidently represents the primine ; and, as the raphe has pursued its course between it and the secundine, this latter must be represented by the endopleura ; but the nucleus and embryonic sac are either pushed back by the embryo, and reduced to membranes lining the inner wall of the secundine, or they completely disappear; the secundine itself may indeed disap- pear, and the embryonic sac alone remain with or without the nucleus. Lastly, these 138 ANATOMY. membranes may be united and confounded, so as to become indistinct. The primine therefore cannot be identified with the testa, except in cases when the latter can be cleanly removed, exposing the raphe between it and the endopleura ; and then the endopleura is obviously formed by the secundine, with or without the tercine and quintine, as may be easily seen in the Orange. The three typical modifications in the positions of the parts of the ovule being known, we will indicate the corresponding portions of the embryo in the seed : — FIRST TYPE. — Ovule straight (orthotropous), and consequently embryo antitropous ; — the seed may be : 1, erect (radicle superior) ; 2, pendulous (radicle inferior) ; 3, hori- zontal-parietal (radicle centrifugal) ; 4, horizon.tal-axile (radicle centrifugal). SECOND TYPE. — Ovule reversed (anatropous), and embryo Jiomotropous ; — the seed maybe: 1, erect (radicle inferior); 2, pendulous (radicle superior); 3, Jwrizontal- parietal (radicle centrifugal) ; 4, horizontal-axile (radicle centripetal). THIRD TYPE. — Ovule curved (campylotropous), and embryo amphitropous ; if the embryo is not much curved, the radicle is inferior, superior, centripetal, or centri- fugal, according to the position of the micropyle ; if neither extremity of the embryo is turned towards the hilum, owing to the unequal growth of the coats, it is said to be heterotropous ; it may then be either straight, curved, or flexuous, and the radicle is inferior, superior, centripetal, centrifugal, or vague. ACCESSORY ORGANS. To complete the anatomy of the elementary and fundamental organs, we must describe that of certain modifications of the cellular tissue : these are prickles, hairs, I/lands, and lenticels. Prickles. — These are composed of a cellular tissue analogous to that of the bark; they must not be confounded with spines, which are fibro-vascular, and are merely transformed organs, whose nature is indicated by their position; i.e. they are aborted branches (Blackthorn, fig. 51), hardened stipules (Robinia, fig. 114), petioles of pinnate leaves become spiny after the fall of the leaflets- (Astragalus Tragacantha), leaves of which the nerves have lengthened into spiny points, to the destruction of the parenchyma (Berberis, fig. 94) ; cushions, which elongate greatly, and become pungent (Gooseberry, fig. 95). Prickles, on the contrary, are dispersed without order on the stem and leaves, and even on the corolla, and are thickened, hardened, and pungent hairs. When young, they exactly resemble hairs, of which we are about to speak, and it is only when older that they thicken, lengthen, and harden ; they occur on the Rose (fig. 50) in every stage of its growth. Hairs. — Cellular organs, which principally occur on branches, petioles, and the nerves and under surface of leaves, especially young simple oiic-eHkHi ones ; they are lengthened epidermal cells, covered bv cuticle, like nair (mag.). •» ^ o a. j those cells which do not lengthen. Hairs are unicellular, when formed of one elongated, vertical, oblique, or horizontal cell, which may remain simple ACCESSORY ORGANS. 139 (fig. 731), or branch, in a fork (fig. 732), trident, star (fig. 733), &c. Some branch in stages, and resemble superimposed whorls (fig. 734). Chambered, septate, or jointed hairs are composed of cells joined end to end, and forming v simple beads (figs. 735, 736) or branches; sometimes a bundle of y hairs radiates horizontally from a common centre, and, being united 732. Whitlow- gra-s. Bifur- cated one- celled hair (mag.)- 733. Alyssnrn. Starred one-celled hair (mag.). 735. Tradescantia. Chambered hair (mag.). 736. Mirabilis. Hair resembling a necklace(m ag. ) . 737. Etoagnua. Radiated hair (mag.). 734. Alternanthera. Branched hair (mag.). The small brown scales by the cuticle, resembles the rays of the sun (fig. 737). observable on ferns are considered as scarious hairs. Glands. — These are organs of secretion, i.e. they extract a peculiar liquid from the materials with which they come in contact ; they are entirely cellular ; the cells of some glands project, and are called glandular hairs, which only differ from ordinary hairs by the liquid they contain ; some are swollen at the tip ; most are unicellular, as those on the calyx of the Sage (fig. 738), and on the velvety palate of the Snapdragon (fig. 739). The stinging hairs of the Nettle (fig. 740) are formed of a single conical cell, of which the base is swollen into a bulb, and surrounded by a group of epidermal cells ; the top is lightly bent, and it is the fragile tip of this hair which, breaking in the skin which it has penetrated, intro- duces the venomous juice contained in the cell. The sting- ing hairs of the Wigandia lanceolate have a tip (fig. 741). Glandular hairs may be "8. sage. Glandular chambered, one-ceiied imir i, 4.1, • i (mas°- when the terminal 739. Snapdragon. 740. Nettle. 74.'. Snapdragon. Glandular one- Stinging one-celled Glandular celled hairs hair, bent chambered hair (mag.). at the top (mag.). (mag.). 741 Wigandia Stinging hair with lanceolate point (mag.). cell alone is glandular, as in the calyx of the Snapdragon (fig. 742) ; or there may be several superimposed cells; but it is invariably the upper ones alone which secrete. Peltate hairs are composed of one cell lying horizontally on the leaf, and adhering by its centre to the epidermis, by means of a gland which forms its base (Malpighia). True glands differ from glandular hairs only in projecting slightly or not at all 140 ANATOMY. above the epidermis ; they pass insensibly into each other, as in glandular roses. The superficial glands covering the bracts and flowers of the Hop (fig. 743) are simple vesicles (fig. 744) containing a liquid, and a resinous principle called by chemists lupuline; these vesicles burst and soon disappear, when the resinous principle remains in the form of powder. Sometimes the glands are sunk in the thickness of the bark, but they are always near the epidermis ; such are the glands called vesicular of the leaves of St. John's Wort and Myrtle, and of the bark of the Orange, which contain a volatile oil (fig. 745). We have already described the nectariferous glands or nectaries, which secrete a sweet liquid (p. 74). The cavities called reservoirs of proper juice, in which gums, resins, &c., are elaborated and accumulated, are lined with peculiar cells ; they are analogous to the vesicular glands, but more deeply immersed in the tissue. Lenticels. formerly called lenticular glands, are not glandular ; they 743. Hop. 9 flower (nnur.). 744. Hop. Superficial glands containing lupuliiie (mag.). 745. Orange. Vertical section of a fragment of rind, showing the reservoirs (it) of volatile oil (mag.). are prominences on the surface of the stem (fig. 746, 1), produced by excrescences of the endopleura which have pierced the bark. Adventitious roots often spring from lenticels ; but they also spring from many other points ; which invalidates the opinion of De Candolle, who regarded lenticels as the buds of aerial roots. ANATOMY OF ACOTYLEDONS. Stem. — The stems of Ferns more nearly resemble those of cotyledonous plants than do those of any other acotyledonous order. A transverse section of a Tree-fern stem (fig. 747) shows fibro-vascular bundles (f, v) of various forms, disposed in a more or less irregular circle, which surrounds a yellowish central disk (m), and is itself sur- rounded by a zone of the same colour (p) ; this disk and zone are cellular, and communicate by larger or smaller passages between the bundles. The outermost blackish zone is an envelope formed subsequently to the epidermis, of the bases of the fronds. A transverse section of the bases Transverse section of the stem, of these fronds displays a structure analogous to that of the stem, on which their bases, when detached, leave remarkable scars. The same ANATOMY OF ACOTYLEDONS. 141 f 748. Male Fern. Transverse section of the rhizome. 749. Male Fern. Rhizome showing the scars (c) of the old fronds. structure and scars characterize the stems of the herbaceous ferns of Europe (figs. 748, 749). The fibro-vascular bundles of ferns, whether exotic or indigenous, con- sist of a pale portion (fig. 747, v), formed of annular and radiating prismatic (scalariform) vessels, surrounded by a very narrow black zone (f), formed of woody fibres. Trachese are invariably wanting. A few other acotyledonous families con- tain fibro-vascular bundles in their stem ; in Mosses and Hepaticce the stein is com- posed of elongated cells, which sometimes become fibres ; the tissues of Lichens, Fungi, Algae, &c., are entirely cellular. Root. — The roots of the higher acoty- ledons, such as ferns, present the same structure as the stems ; i.e. bundles of fibres and vessels, surrounded by cellular tissue; these roots are always adventitious and often aerial. In the lower acotyledons they are formed of cells which reach the ground, and then lengthen and bury themselves. Leaves. — The leaves of acotyledons present the same structure as their stems ; in ferns, we find radiating prismatic vessels and black fibres ; in Marsileacece, the nerves are numerous ; in Lycopodiacece, the leaf is a cellular plate traversed by a single fibro-vascular bundle ; in Mosses and Hepaticce, the nerves are represented by elongated cells ; in the lower acotyledons, the leaves and stem are represented by a frond entirely composed of cellular tissue. Reproductive Organs. — Antheridia are little sacs, at first perfectly closed, then opening at a certain period at one point of their surface, and emitting by this opening a mass of corpuscules, usually cohering by means of a mucilaginous liquid ; these organs are considered analogous to anthers ; we shall explain their nature in the description of the Orders. Spores are little membranous sacs, full of liquid, which germinate by lengthening at some undetermined point of their circumference, and develop into a little plant similar to that which produced them. Spores are formed in particular cavities, called sporangia ; they are the analogues of seeds, with regard to their functions, but they possess neither coats, caulicle, radicle, plumule, nor cotyledons ; they are developed freely in the sporangium, and never adhere to its walls, as the seeds of cotyledons adhere to their placenta. The sporangium, which fulfils the functions of a carpel, has neither style, stigma, nor ovarian cavity ; it is filled with a con- tinuous cellular mass, in the midst of which are certain isolated cells, destined to reproduce the plant. We shall explain the spores and sporangia when describing the characters of the Orders. ELEMENTS OF VEGETABLE PHYSIOLOGY. FOOD OF VEGETABLES. The food necessary for the development of the plant is drawn from the soil by the root, and is absorbed by means of the spongioles which terminate the root-fibres, and which are composed of a renewable cellular tissue having no epidermis. The substances drawn from the soil are, carbonic acid, ammonia, and alkaline and earthy salts dissolved in water. Carbonic acid comes: 1, from the rain, which has dissolved it in passing through the atmosphere ; 2, from the slow decomposition of humus or mould, the carbon of which combines with the oxygen of the air, which the water holds in solution. The ammonia comes: 1, from rain during storms, when, by the influence of electricity, it is formed from the nitrate of ammonia; 2, from the putrefaction of vegetable or animal matter, at the commence- ment of which azote and hydrogen combine. This decomposition is aided by adding chalk to cultivated soil ; for chalk, as Boussingault has proved, attacks insoluble azotized matters, and favours the formation of ammonia. The alkaline and earthy salts, and notably the sulphates, and phosphate of lime are derived from the soil ; the sulphates are decomposed by the ammonia, which substitutes itself as their base, and forms a sulphate of ammonia, which, being soluble in water, and containing azote, hydrogen, sulphur, arid oxygen, is eminently adapted for the nourishment of plants. Phosphate of lime, which is insoluble in pure water, is soluble in water containing either an ammoniacal salt or carbonic acid only, as is the case with rain. The water which holds in solution these different inorganic substances is a colourless liquid, which rises by the vessels into the root, stem, and leaves, fills the cells and their interstices, in which, during life, are formed the organic matters which are to be deposited in the tissue of the vegetable, or to assist in its growth. The above-mentioned inorganic substances are all binary compounds, which sometimes remain isolated, sometimes enter into combination with one another. But the organized substances which are found in the plant are the results of more com- plicated combinations ; we have already spoken of cellulose and starch, allied to which is a third substance named dextrine, which does not turn blue with iodine, and which is soluble in water ; its chemical composition is exactly the same as that of cellulose and starch, which are ternary bodies, composed of carbon, together with FOOD OF VEGETABLES. 143 hydrogen and oxygen in the same proportions as water. These three bodies, formed from the same elements in similar proportions, are called isornerous bodies; the difference between them consists entirely in the manner in which their molecules are grouped ; it is therefore simply necessary to derange these molecules to convert dextrine, cellulose, and starch into each other. The sugar yielded by the Sugar-cane, Beetroot, and many other vegetables is also a ternary compound very similar to the preceding ones, containing one molecule more of water than starch, dextrine, and cellulose contain. Glucose or grape-sugar only differs from cane-sugar in containing three molecules more of water. Thus starch or dextrine, with an additional molecule of water, becomes cane-sugar ; and grape-sugar from which three molecules of water are abstracted becomes cane-sugar. Organic acids, such as acetic acid, which is found in the sap of plants, and forms in sour wine, pectic acid in the gooseberry, tartaric acid in grapes, malic acid in apples, citric acid in the lemon and other fruits, gallic acid in oak-galls and bark, &c., are ternary compounds which contain carbon and the elements of water (oxygen and hydrogen), plus a certain quantity of oxygen. Oils, essences, resins, chromule or chlorophyll, are ternary compounds, formed by the combination of carbon with the elements of water, plus a certain quantity of hydrogen. Besides these, vegetables contain, especially in their bark, quaternary compounds of carbon, hydrogen, oxygen, and nitrogen ; these crystallize, and are always found in union with an organic acid which forms a salt with them, whence their name of vegetable alkalies. The Poppy contains morphine, narcotine, &c. ; the Nux vomica, strychnine ; the genus Cinchona, quinine, cinchonine, and cusconine. Experience has proved that the poisonous and medicinal properties of vegetables reside in the organic alkalies. Other organic substances frequently found in vegetables are still more com- plicated ; for, besides oxygen, hydrogen, carbon, and nitrogen, plants contain sulphur and phosphorus : these are albumen, fibrine, and casein ; the proportions of their elements are similar, although their physical properties are different ; whence the name of protein by which chemists designate the essential principle of all those substances that are collectively designated albuminous. Protein has been alluded to under the nucleus ; it constitutes the nutritious element of vegetables, for without it no blood can be formed, and it is always found in this liquid. Fibrine is a compound substance, insoluble in water, like cellulose ; it may be looked upon as the origin of all the parts of a plant ; it always exists in them, and especially in the seeds of cereals. Albumen coagulates with heat like starcJi ; it constitutes nearly all the serum of blood and the white of eggs, and abounds in the juices of plants. Casein, which forms with starch the nutritive part of beans, lentils, and peas, constitutes essentially, in the milk of animals, the nutriment that the young receives from its mother. Gluten, which forms the base of leaven or^ yeast, exists in most seeds, and is composed of the same elements (less the sulphur and phosphorus) as albumen, fibrine, and casein. The elements of carbonic acid (oxygen and carbon), of ammonia (hydrogen and lit VEGETABLE PHYSIOLOGY. •nitrogen), of water (oxygen and hydrogen}, and the sulphur of soluble sulphates, supply most of the materials of vegetables. The carbon of carbonic acid by uniting with the" elements of water forms cellulose, sugar, gum, starch, &c. ; an excess of oxygen produces vegetable acids (malic, citric, acetic, gallic, &c.) ; an excess of hydrogen produces chlorophyll, oils, resins ; the azote of ammonia, added to the elements of water and of carbonic acid, gives rise to vegetable alkalies (quinine, -morphine, &c.) ; finally, sulphur and phosphorus, combined with azote, oxygen, hydrogen, and carbon, form three organic substances of similar composition, namely, fibrine, albumen, and casein; these supply the animal kingdom with essentially nutritious elements ; as stated above, they are always found in the blood, united with other substances, and notably with a certain quantity of phosphate of lime, a salt which constitutes the solid part of bones. Humus or mould is the name given to the black carbonaceous matter which results from the decomposition of organic substances ; vegetable mould is nothing but cellulose, which burns slowly under the influence of the oxygen of the atmosphere, and changes into carbonic acid, which, dissolving in the water of the soil, passes into the substance of the vegetable. The decomposition of the mould is assisted by mineral alkalies (potash, soda, chalk) magnesia), which induce the formation of carbonic acid, and form with it soluble carbonates, absorbed by the roots; then, under the influence of these same alkalies, the water and carbonic acid decompose, and vegetable acids are formed, more or less oxygenized, with which they combine ; finally, these acids change, and become sugar, starch, or cellulose. Thus, vegetable acids are indispensable to the existence of plants, and their formation depends : 1, on the water and carbonic acid which combine to form them ; 2, on the mineral alkalies which induce this combination. Now these alkaline bases, which play so important a part in vegetation, reside in hard or soft rocks, named feldspar, mica, granite, gneiss, basalt, the elements of which are silica, alumina, potash, magnesia, lime, &c. ; these bases are liberated by the disintegration or decomposition of the rocks, of which the debris, more or less changed, constitute arable soil. The rocks are disintegrated by the water which, having penetrated them, expands in passing to the state of ice, and thus overcomes the cohesion of their elements. These elements are then dissolved by water, either pure, or containing oxygen, or loaded with carbonic acid ; it is thus that the aluminous and alkaline silicates are disintegrated and dissolved, previous to forming argillaceous soils. Alkalies, and especially potash, when mixed with soil, are rendered soluble by the addition of sulphate of lime, as Deherain has proved. Since the sulphate of limo changes the salts of potash into sulphate of potash, it has been supposed that the greater solubility of potash after being thus treated is attributable to this trans- formation ; this hypothesis has not yet been practically proved, and we do not know whether the sulphate acts chemically on the potash, or whether its effects are purely physical, the object being to liquefy the soluble salts, to preserve them from the ab- sorbent action of the earth, and to facilitate their absorption by the roots of the plant. But, whatever be the explanation, this property of sulphate of lime proves the advantage of adding it to the soil in which leguminous fodders are cultivated (Trefoil, Lucerne, NUTEITION OF VEGETABLES. 145 Sainfoin), of which the ashes are rich in potash ; while, on the contrary, the addition of carbonate of lime, which induces the formation of ammonia, is very usefully employed in the cultivation of cereals, for which azotized manures are necessary. Silica is useful, because, being powdery and insoluble, it admits air and mois- ture, alumina, because it retains moisture, around the roots; lime, because, under the influence of water acidified by carbonic acid, it replaces the alkaline bases of the silicates ; hence the importance of marl, which is a mixture of clay and lime. If the soil is composed of pure silica or of pure chalk, it is absolutely sterile ; if it is wholly of clay, the roots cannot penetrate it. The best soil is that in which clay is mixed with carbonate of lime and sand (silica), in such proportions that air and moisture readily permeate it. Tillage improves the soil by breaking it up, and multiplying the surfaces which ought to be in contact with carbonic acid, the ammonia of the rain, and the oxygen of the air, so that the debris of the rocks may be rendered soluble, and form arable land. The period of fallow is. that during which the soil is left to atmospheric influences. While the land is thus left fallow as a preparation for certain crops, it may be occupied by some other plant which does not rob the soil of the materials required for such crops ; this explains the theory of the rotation of crops. NUTRITION OF VEGETABLES. Absorption. — The roots are the principal organs of absorption ; they pump up the liquid into which they are plunged, by means of their permeable cells. The upward movement of the sap is explained by a recent discovery in physics : — if a tube closed below by a porous membrane, and filled with a dense liquid, is plunged into a less dense coloured liquid, there is soon a tendency to establish an equilibrium of density, and the dense liquid in the tube becomes coloured by the addition of the less dense liquid outside it, and the two liquids stand at different heights ; that in the plunged tube rises above its level, and only stops rising when its density is no longer greater than that in the outer tube. But to produce this equilibrium, the exterior liquid must receive a certain quantity of that within ; thus there is a double current esta- blished through the porous membrane ; the one from without inwards, called endos- mose ; the other, less in degree, from within outwards, called exosmose. This action accompanies the absorption of fluid by the roots ; the damp soil contains water laden with ammonia, carbonic acid, and different salts ; the roots, as well as the stem, are composed of a series of superimposed cells, some of which are filled with a dense juice, and others with vessels in which the liquid can easily rise by capillary action ; the spongioles which terminate the root- fibres having no epidermis, are very permeable, the water of the soil penetrates them, the juice which they contain is diluted by this water, and to establish equilibrium the sap rises from cell to cell to the top of the plant. Circulation. — When the water of the soil, laden with the carbonic acid, ammonia, and mineral matters dissolved in it, has penetrated the plant, it takes the name of L 146 VEGETABLE PHYSIOLOGY ascending sap ; this sap thickens as it ascends, in proportion as it dilutes and dissolves the materials in the cells ; but to the motive force of the endosmose and capillary action is added another not less powerful : this is the attraction exerted from above by the buds, which draw up the food necessary to their development, and by the already formed leaves, from the surface of which copious evaporation is carried on. The empty spaces resulting from this evaporation and from the substance assimilated by the buds, are filled by the sap in the parts immediately below ; these repair their losses in their turn, and this action is continued from above down to the roots, for which the soil is the reservoir. The buds are the first organs of the vegetable which awake in spring from their winter torpor ; when they begin to swell, the resulting movement of the sap stimulates the roots, which recommence their functions ; from this time the ascending current, assisted by the endosmose, is established through the swollen tissues of the thickened materials deposited the preceding year. Nevertheless, although it is the buds which give the roots the signal to recommence their work, the work of the roots is carried on independently of the influence of the buds ; for these remain closed long after the sap has begun to rise with remarkable force and abundance. If at the period of the spring sap an incision is made in a stem, a stream of sap flows from it, and the proof that neither the buds nor the leaves are the cause of this phenomenon is that it occurs just the same on a stem deprived of buds and leaves. An example of this is seen in the tears of the vine, which flow from the stem when the plant is pruned, and even when it is cut almost to the ground ; but as the buds lengthen, and as the branches resulting from their elongation become covered with leaves, the suction of the young branch and the evaporation from the surface of the leaves become active forces, which join those of the endosmose and capillary action to assist the ascension of the sap. When the branches are developed and consolidated, the movement of the sap slackens, but without ceasing ; its only object now is to provide for the daily require- ments of the plant, and to prepare materials for the vegetation of the following year. When the spring rise of sap has taken place early, these materials are prepared before autumn, and then the August sap is produced, which represents a second spring. In the autumn, the tissues, more and more solidified, dry up ; the leaves, of which the canals become obstructed by a continual efflux of materials, cease to vege- tate, and fall ; evaporation is thenceforth arrested, and with it the movement of the sap ; and finally, life is suspended for several months. The ascent of the sap does not always take place in the same manner ; in spring it rises across all the woody tissues ; in old branches, across the sap-wood only. Later, most of the vessels are empty except of gases ; it is then by the cellular tissue that the sap rises to support the vegetation. When the sap, laden with the materials that it has dissolved in its ascending and diverging march, has reached the young branches, it penetrates their cortical pith and the parenchyma of the leaves ; there it finds itself in contact with the air which has penetrated by the stomata into the intercellular spaces ; then it under- goes important modifications, and loses a large portion of its water, which evaporates NUTRITION OP VEGETABLES. 147 on the outside. The cells of the green parts of the bark and leaves fill with chloro- phyll. The latex of the laticiferous vessels becomes charged with coloured granules, and the sap, thickened and enriched with new principles, descends from the leaves along the inner surface of the bark towards the roots. This descending movement is easily proved ; it is sufficient to prune the bark of a young branch to see the sap, if it is coloured, ooze from the upper lip of the incision and not from the lower. If the stem be tightly corded, after some time the bark swells, and forms a cushion above the ligament, while the stem below will preserve its original diameter. For this reason the elaborated sap is also called descending sap. The elaborated sap furnishes the cambium, a gelatinous fluid which permeates the cellular zone, and in which are formed the elementary organs which combine to produce growth in the vegetable. In dicotyledonous stems, the cambium is principally deposited between the woody and cortical systems, within the layer of laticiferous vessels and the fibres of the liber, in contact with which the descending sap flows. The young buds springing from the axil of a leaf are placed in the direction of the flow of latex from that leaf, and which, accumulating at the base of the petiole, elaborates there the elements of cambium. In monocotyledonous stems, the fibres analogous to the liber and the vessels of the latex, which each fibro-vascular bundle contains, furnish an elaborated sap, which deposits cambium in heaps dispersed through the stem ; so that their terminal bud profits by the sap elaborated by the leaves of the preceding bud. Finally, rain, containing the materials for the food of the vegetable, is absorbed by the tips of the roots, rises in the stem, crosses the wood system, reaches the parenchyma of the leaves and the cellular tissue of the bark, where it undergoes the action of the air, becomes elaborated sap, descends through the bark, deposits a zone of cambium between the liber and alburnum, and arrives at the tips of the roots, whence it started ; thus establishing a true circulation. Cyclosis is a peculiar circulation which Schultz has discovered in the laticiferous vessels ; he observed that the coloured granules flow in sinuous tracks, being carried by the latex currents in various directions along the courses of the anastomosing laticiferous vessels. Physiologists have proposed different theories to account for the propelling force which puts the latex in motion ; but Mohl has shown that this motion is not a vital phenomenon, but that it always arises, either from a rent in the tissue, whence the latex necessarily escapes, or from a mechanical pressure on the tissue, which sets the latex in motion ; as also that this motion soon ceases. But if cyclosis is an obscure and doubtful phenomenon, this is not the case with the intercellular circulation (rotation), which can be observed in the septate hairs of certain plants (Tradescantia), and especially in the cells of certain aquatics (as Chara) . Chara is a leafless, frondless acotyledon ; its internodes, whether isolated or in bundles, consist of cylindrical cells placed end to end ; each internode pro- duces at its top a whorl of cells similar to itself, which speedily become similarly septate. If one of these cells be placed under a microscope, and cleared from the L 2 148 VEGETABLE PHYSIOLOGY. calcareous crust which often envelops it like a bark, numerous granules are seen floating in a transparent liquid within the cell, and forming a current which rises along one of the lateral walls, then flows horizontally along the upper wall, then descends along the other lateral wall, and becomes again horizontal along the lower wall of the cell. It is this intracellular motion which has been called rotation, a very inappropriate term, for which it would be better to substitute that of cydosis (abolished by Hugo Mohl), which expresses much more exactly the circular move- ment of the sap in the cell. Respiration. — The carbon of plants is derived from the carbonic acid contained in the air ; the roots absorb it with the water of the soil which holds it in solution ; whilst the carbon of the air enters the leaves through their stomata. Many experiments prove that the leaves and green parts exclusively possess the power of decomposing carbonic acid, thus separating the oxygen, and restoring it to the atmosphere ; they also decompose water and retain the hydrogen ; this power is only exercised under the influence of sunlight. Now animals are constantly burning carbon by means of the oxygen of the air, and exhaling carbonic acid, in which operation they consume an enormous quantity of oxygen ; but plants, by their respiration, restore the balance, for they provide an inexhaustible store of pure oxygen, and incessantly repair the loss which the atmosphere has sustained through the respiration of animals. The power possessed by leaves of decomposing carbonic acid ceases at night or in darkness ; then the carbonic acid, absorbed by the roots with the water of the soil, enters the stem, and remains dissolved in the sap with which the plant is impregnated ; soon this water evaporates through the leaves, and carries off the carbonic acid which it held in solution. The green parts of plants absorb oxygen during the night by a chemical process, which tends to produce a change in the materials contained in their tissues. To blanch plants, they must be placed under the same conditions as the green parts of vegetables are during the night, namely, in continuous darkness ; the carbonic acid is then not assimilated, the green chlorophyll is not formed, and their tissues con- tain an excess of water ; and the horticulturist is thus enabled to expel the bitter principle from stems or leaves. This exclusive property of Ihe green parts is perhaps due to their having absorbed the chemical rays of the solar light, which rays may aid in the decom- position of carbonic acid in the chlorophyll. Respiration, which is the reciprocal action of the sap upon the air, and of the air upon the sap, is carried on in the intercellular spaces (lacunae) beneath the slomata, where the air comes into contact with the parenchyma. Submerged plants, which have no epidermis, and whose parenchyma is hence exposed to the fluid, decompose the carbonic acid which the water always contains, under the influence of light transmitted through the water ; they fix the carbon and reject the oxygen, which remains in solution, and supports the life of aquatic animals. Here, as in the air, the Animal and Vegetable Kingdoms reciprocate only under the stimulus of light; and if the water be too deep, the plant becomes pale and etiolated. NUTRITION OF VEGETABLES. 149 Besides the elaboration of sap by the green tissues, other truly respiratory processes are carried on in the plant for the purposes of assimilation : thus, when the seed germinates, it absorbs oxygen and liberates carbonic acid ; a process analogous to the respiratory in animals, and which is continued until the first leaves of the embryo are developed. Similar respiratory processes accompany flowering ; the petals and stamens absorb, by day as well as by night, much oxygen, and emit much carbonic acid ; hence the noxious quality of the air in a room full of plants ; which is greatly increased "by the exhalation of carburetted hydrogen, contributed by the volatile oils to which the perfume of the corolla is due, Evaporation is a phenomenon analogous to the pulmonary perspiration of animals, and should be treated of after respiration. Evaporation is one of the most active agents in the ascent of the sap ; it goes on through all the pores on the surface of the green parts, but especially through the stomata ; increasing or diminishing as the surrounding air is drier or moister. Leaves possess in a slight degree only the power of absorbing the watery vapour in the air ; and though certain uprooted plants remain fresh for some time, this is due to their losing little by evaporation. So, too, leaves floating with their lower surface on the water do not wither, not because they absorb water, but because their stomata being stopped up, evaporation is arrested. Excretions. — A plant, after being nourished by the materials of the elaborated sap, rejects by its leaves, glands, bark, and especially by its root, all useless or noxious matters. Thus, to express in a few words the nutritive functions of its life, a vegetable may be said to absorb, breathe, assimilate, perspire, and excrete, Direction of the Axis. — The stem tends, always to ascend, and the root as uniformly to descend, and even in underground stems the tip of the rhizome always turns upwards. In the Mistleto, a parasite, the seed, fixed to the branch of a tree, germinates on the bark, and always directs its radicle towrards the centre of the branch, and its plumule in the opposite direction ; here the tree takes the place of the soil, and the root obeys a centripetal, the stem a centrifugal force. Attempts have been made to elude this general law of the direction of axes, by reversing the seeds of young plants, when the root bends round to the earth, and the stem turns upwards. A box of damp earth has been so suspended that seeds could be planted on the lower surface of the earth, the soil being above, air and light below ; still the stems rose into the earth, the roots descended into the air. Movements of Leaves and Flowers. — Leaves constantly direct their inner surface towards the sky, and their outer towards the earth ; if this direction is reversed by twisting the base of the petiole, the leaf constantly tends to turn round in spite of all obstacles, and if these obstacles be insuperable, it gradually, dies; if the branch be reversed artificially, the petiole twists ; if the reversion is natural, as in weeping trees, the torsion of the petiole is spontaneous, and the inner surface turns towards the sky ; if, finally, a leaf be so suspended that its blade is horizontal and its inner surface is turned downwards, the blade speedily turns round, and resumes its normal position. This instinct of the leaf depends neither on air nor on light, for it is displayed in water and in darkness. But with many species, the state of the 150 VEGETABLE PHYSIOLOGY. atmosphere, Whether gloomy or bright, dry or moist, hot or cold, gives rise to singular movements in leaves and flowers. Thus, during the night the leaflets of the Bean and of Trefoils rise ; those of the Liquorice and of Rolinias hang vertically. This phenomenon has been called the sleep of plants; and to prove that this sleeping and waking depends on the absence and presence of light, plants have been caused to sleep at mid-day, by placing them in the dark j whilst others hare been wakened at night by a strong artificial light. There are various exotic plants, which, waking by day and sleeping by night in their native country, retain in our houses the habits of their climate, which being the reverse of ours, they sleep during our day, and wake when the sun has sunk below our horizon. Tropical plants wake and sleep with us as if we had a perpetual equinox.1 Certain plants exhibit movements induced by accidental external stimuli ; such is the Sensitive Plant (Mimosa pudica). Its periods for sleeping and waking do not precisely coincide with our night and day, its waking periods being subject to vicissitudes depending on the slightest causes : a gentle shake, a breath of wind, the passage of a storm-cloud, the falling of a shadow, offensive va,pours, the most delicate touch, cause the leaflets to droop suddenly, and closely overlap each other along the petiole, which then droops also ; but soon after, if the cause be removed, the plant recovers from this sort of faint, all its parts revive and resume their first position. Venus' Fly-trap (Dioncca muscipula} is a small North American herb, whose excitability is fatal to the insects which approach it ; its leaves terminate in two rounded plates, joined by a hinge like the boards of a book, and fringed with marginal bristles ; on their upper surface are two or three little glands which distil a liquid attractive to insects ; when a fly touches these, the two plates close sharply and seize the insect, whose efforts to escape increase the irritation of the plant, which finally crushes it? ; when the insect is dead and all movement has ceased, the plates expand again, and await a fresh victim. These phenomena, which are the effect of excitement, are not so exceptional as might be supposed ; many plants of our climate offer analogous though much less remarkable examples. The opening of some flowers is due to the stimulus of light : most open by day, though some by night, as the Marvel of Peru (Mirabilis longiflora&nd Jalapa) ; others open and close at various hours, and the hour of the day may be ascertained by watching their habits. Linnaeus arranged his floral clock in accordance with these periodical changes ; but such a clock, in our variable climate, is often too slow or too fast ; it can only be correct in the torrid zone, where there are but few atmospheric changes. The heat and moisture of the atmosphere also influence the daily motions of flowers : certain species foretell rain by closing in the middle of the day, or by remaining open in the evening, or by not opening in the morning. Attempts have been made to construct a floral barometer from these observations, but its perform- ances are far more irregular than those of the floral clock. 1 These statements are opposed to all the established phenomena of plant-life, as known to English observers. — ED. 151 PHENOMENA OF REPRODUCTION. Fertilization. — Under Organography, the fertilizing action of the pollen on the ovules was alluded to, but not explained ; we shall now analyse some details of this wonderful process, the most important of all departments of Vegetable Physiology. ., f The ancients had confused ideas as to the nature of the stamens ; the botanists who wrote after the Renaissance hazarded some vague conjectures on this subject ; and it was only towards the end of the seventeenth century that their true functions were assigned with precision to the pistil and stamen. Tournefort rejected the fact of fertilization, and persisted in considering the stamens as organs of excretion. After his death, the most devoted of his disciples, Sebastian Vaillant, in a discourse delivered in 1716 at the King's garden, explained the functions of the stamens, and demonstrated incontrovertibly the phenomena of fertilization in plants. Thanks to this discovery, the date of which is known, France claims the honour of the most important discovery which had hitherto been made in Botany. Eight years later, Linnseus popularized the doctrine of fertilization by his writings, which were no less remarkable for their learning than for their logical accuracy and poetic charm. A few examples will suffice to prove the necessity of the pollen to fertilize the ovule. The Date is a dioecious tree, whose fruit is the principal food of certain eastern nations. From time immemorial these have habitually suspended panicles of male flowers on the female plants, when fertilization invariably ensues. These nations, when at war, destroy their enemies' male Date-trees, and so starve their owners by rendering the female plants sterile. When the rainfall is excessive at the flowering season of the Vine, the growers say that the vine runs, i.e. that the pistils are abortive ; whicli is owing to the pollen having been washed away, and fertilization having consequently not been effected. In newly-discovered Pacific islands, dioecious Cucurbitacece introduced for the first time have produced female flowers ; but there being no males, fertilization has never taken place. Botanists can prevent or produce fertilization by cutting away all or some only of the stigmas of a pistil ; in the latter case the ovaries corre- sponding to these stigmas do not produce seed. A pistilliferous Palm cultivated in a hothouse at Berlin had been sterile for eighty years, when some pollen from a staminiferous plant of the same species was sent by post from Carslruhe, by whicli the Berlin tree was fertilized; it was then left sterile for eighteen years, after which time it was again artificially fertilized, and the operation succeeded as at first. Experimenters have employed other means to demonstrate the physiological action of the stamen ; they have placed the pollen of one species on the stigma of a different species, belonging to the same genus, when individuals have been produced partaking of the nature of both species. Plants thus produced by cross fertilization are termed hybrids ; their organs of vegetation are pretty well deve- 152 VEGETABLE PHYSIOLOGY. loped, but those of reproduction are imperfect, and their seeds are unfertile after one or two generations. Connected with this interesting subject of fertilization is the history of Ccelebogyne ilicifolia, an Australian Euphorbiaceous shrub, which cannot be omitted here. Its flowers are dioecious, and for many years female individuals have been cultivated in English Botanic Gardens, which, without the co-operation of stamens (for there is not a single male plant in Europe), have produced seeds which have germinatjed, and produced in their turn individuals perfectly resembling the mother plant. Here the production of fertile seeds without the intervention of pollen is incontestable. But we do not think that this exceptional phenomenon (which has, however, been almost authentically paralleled by Hemp and Mercurialis, both indigenous dioscious plants) will overturn the admitted doctrine of the fertilization of the ovule by the pollen ; and we find no difficulty in admitting that Nature has given to the seeds of certain dioscious plants a power of multiplied reproduction, which may extend to several generations, such as is proved to exist in the ease of Aphides. Besides, the force of the anomaly presented by Ccelebogyne cannot be esti- mated at its true value until time shall have shown whether this power is limited or indefinite. The period of fertilization is that at which the flower exhales its perfume and appears in its full beauty ; the stamens and pistil then exhibit spontaneous motions, which in some species are very remarkable. Thus, in the Berberis, the filaments of the stamens are at first pressed between the two glands of each petal, which as they spread force the filaments to spread also ; these soon free themselves under the stiioulus of the sun, aided by a slight evaporation which has contracted these and the glands which retained them ; when they quickly resume their original bent position and approach the pistil, on which the anthers shed their pollen. This action, which is effected by the solar rays, may be artificially induced, either by gently irritating the filaments, or by shaking the flower ; for the least shake or slightest touch releases the stamen. The same irritability is observable in Parie- taria and in Nettles, the filaments of which lie curved back within the calyx, but instantly spring up, if lightly touched; when the anther, which was previously pressed down at the bottom of the flower, is carried up, and sheds a little cloud of pollen. Rue sheds its pollen with less force but with better aim ; it has four or five petals and eight or ten stamens ; on most flowers there is one stamen which, instead of spreading horizontally over one or between two petals, bends over the pistil, against which the filament presses. If patiently watched, the anther will be found to open and emit the pollen ; when the stamen, having fulfilled its function, falls back, and another rises to take its place, and so on in succession till all the anthers have in turn shed their pollen on the pistil. The elasticity of the anthers is not always sufficient to discharge the pollen on the stigma. The conditions under which the pollen is discharged are very various ; in many cases the flower is fertilized before expansion ; in many others, the anthers are placed above the pistil, and the pollen is brought directly into contact with the stigma ; but it frequently happens that the position of the stamens is unfavourable to their pollen reaching the stigma, PHENOMENA OF KEPKODUCTLON. 153 when its transmission is effected by the wind, and especially by insects. Butter- flies, flies, moths, bees, and often very small Coleoptera may be seen at the bottom of flowers, eagerly seeking the honey, and thus becoming useful auxiliaries in the fertilization of the pistil, either by dispersing the pollen with their wings, or by carrying the pollen of one plant on the hairs of their bodies to another plant of the same species. Here we must notice a very interesting series of coincidences : when the anthers open to shed their pollen, the stigma becomes viscous to retain it ; nectar is distilled by the glands, and nectar- feeding insects make their appear- ance; lastly, at the same — often very brief- — period, the corolla expands, whose colour and scent must affect the powerful sight of insects and their subtle sense of smell. Mr. Darwin has recently published, on the fertilization of certain plants, experi- ments which throw a new light on Natural Science, and plainly reveal the marvellous precautions taken by Nature to prevent the degeneration of species. He has en- deavoured to give the rationale of the differences observable in the flowers of Primula. In this genus the same species presents two very remarkable forms : a long-styled, in which the stigma is globular and wrinkled, and exactly reaches the mouth of the corolla-tube, far overtopping the anthers, which only reach half-way up the tube. In the other form, the style is not half the length of the corolla, and the stigma is de- pressed and soft, but the anthers occupy the upper part of the tube, their pollen is larger, and the capsule contains more seeds than that of long-styled individuals. This dimorphism between longistyled and brevistyled primroses is constant ; the two forms are never met with on the same individual, and the individuals of each form are about equal in number. Mr. Darwin covered with netting plants of both the long- styled and short-styled forms, most of which flowered ; but as neither produced seed, he concluded that insects are necessary to their fertilization. But as, in spite of his utmost vigilance, he never saw any insects approach uncovered primroses during the day, he supposes that they are visited by moths, which find abundant nectar in them. He endeavoured to imitate the action of insects, which, while extracting honey from flowers, are the agents of their fertilization, and his experiments led him to very interesting conclusions. If we introduce into the corolla of a sliort- styled primrose the trunk of a moth, the pollen of the anthers placed at the mouth of the tube adheres to the base of the trunk, and it may be concluded that this pollen will necessarily be deposited on the stigma of the long-styled primrose when the insect visits it. But in this fresh visit, made to the long- sty led primrose, the trunk, descending to the bottom of the corolla, finds the pollen of the anthers which are situated there ; this pollen adheres to the end of the trunk, and if the insect visits a third flower, which is short-styled, the end of its trunk will touch the stigma placed at the base of the tube, and will deposit the pollen 011 it. Besides this it may be admitted as very probable that in its visit to the long-styled flower, the insect, in drawing back its trunk, may leave on the stigma a portion of the pollen from the anthers placed lower down, and the flower would be thus fertilized by itself. It is besides nearly certain that the insect, when plunging its trunk into a short-styled corolla, will have rubbed the anthers inserted at the top of the tube, 154 VEGETABLE PHYSIOLOGY. and deposited on the stigma of the flower a portion of its own pollen. Finally, the corolla of primroses contains many tiny hemipterous insects, of the genus Thrips, which, moving about the flower in all directions, transport from the anthers to the stigma the pollen which adheres to them ; by which means again the plant will be self-fertilized. In the fertilization of dimorphic species four operations are thus possible : — 1, self-fertilization of the long-styled flower; 2, self-fertilization of the short-styled flower ; 3, fertilization of the short- by the long-styled ; and 4, that of the long- by the short-styled : the two first Mr. Darwin calls homomorphic ; the two others, hetero- morphic. Mr. Darwin has artificially fertilized flowers in these different ways, by pro- tecting them from insects, and he has found in the wild primrose (Primula veris) and in the Chinese primrose (Primula Sinensis) that heteromorphic unions produce con- siderably more capsules and good seeds than homomorphic unions. Thus prim- roses present two sets of individuals, which, although belonging to the same species, and both possessing stamens and pistils, are mutually dependent on each other for perfect fertilization. Mr. Darwin concludes that Nature, in establishing dimorphism in primroses, and in distributing the two forms in equal numbers of individuals, has evidently had in view the crossing of distinct individuals ; the relative heights of the anthers and stigmas obliging insects to deposit the pollen of one set on the stigma of the other. Nevertheless it is impossible not to admit that the stigma of the visited flower may receive its own pollen. Now it is a well-known fact, that if the pollen of several varieties fall on the stigma of one individual, that of one of the varieties is prepotent, and its pollen takes effect to the exclusion of that of all the others. Mr. Darwin thinks that it may be inferred from this that in primroses the heteromorphic pollen, which is known to be the most potent, will overcome the action of the homomorphic pollen whenever the two come into collision ; thus, he adds, indicating the efficacy of dimorphism in producing crosses between individuals of the two forms. These two forms, although both bearing stamens and pistils, are in this case truly dioecious ; each of them is fertile, though the pollen of each is less potent on its own stigma than on that of the other form. Mr. Darwin has studied dimorphism in the different species of Linum, and he has instituted on L. ymndiflorum and perenne a series of experiments which confirm the preceding conclusions. The scarlet-flowered L. cjrandiflorum has also the two types of long and short- styled flowers ; in the short-styled form the five stigmas diverge, project between the filaments, and rest against the tube formed by the petals. In the long-styled form, on the contrary, the stigmas are erect, and alternate with the anthers. Mr. Darwin selected twelve flowers of two long-styled individuals which he fertilized heteromorphically, i.e. with pollen from the short-styled form ; most produced good capsules and seeds; those which were not touched remained absolutely sterile, although their stigmas were covered with a thick layer of their own pollen. He next sought to ascertain the probable cause of this sterility, by placing the pollen of a short- sty led flower on the five stigmas of a long-styled flower, and after thirteen PHENOMENA OF REPRODUCTION. 155 hours he found the latter discoloured, withered, and deeply penetrated by a number of pollen- tubes ; he then made the reverse experiment on a long-styled flower, and this heteromorphic fertilization had the same result as the first. Lastly, he placed the pollen of a long-styled flower on the stigmas of a similar flower, but belonging to another plant ; but at the end of three days not a single pollen-grain had emitted a tube. In another experiment, Mr. Darwin placed on three of the stigmas of a long-styled flower pollen belonging to the same type, and on the two others pollen from a short-styled flower. At the end of twenty-two hours these two stigmas were discoloured and penetrated by numerous pollen-tubes ; the three other stigmas covered with pollen of their own type remained fresh, and the pollen-grains scarcely adhered to them. In Linum perenne, dimorphism is even more obvious that in L. grandiflorum ; the pistil of the one form is much longer, and the stamens much shorter than in the other. Mr. Darwin has ascertained, by numerous experiments on each of the two forms, that the stigmas of one can be impregnated only by pollen from the stamens of the other. It is hence absolutely necessary that insects should carry the pollen from the flowers of one form of Linum to those of the other ; and to these they are attracted by five minute drops of nectar secreted on the exterior of the base of the stamens : to reach these drops, the insect is obliged to insert its trunk between the staminal whorl and the petals. Now, in the short-styled form, if the stigmas, which were originally vertical and faced the floral axis, had preserved this position, their backs only would have been presented to the insect, and the flower could never be thus fertilized ; but the styles having diverged, and protruding between the filaments, the stigmatic surfaces are turned upwards, and rubbed by every insect which enters the flower, thus receiving the pollen which fertilizes them. In the long-styled form of L. grandiflorum the styles diverge very slightly, and the stigmas project a little above the corolla-tube, so as directly to overhang the passage leading to the drops of nectar ; consequently, after an insect has visited the flowers of either form, it withdraws its trunk well covered with pollen. If it then plunges its trunk into a long-styled flower, it necessarily leaves some of this pollen on the papillae of the stigmas ; if it plunders a short-styled flower, it still deposits pollen on its stigmas, the papillee of which are here turned upwards. Thus the stigmas of the two forms receive indifferently the pollen of both, though fertilization of each can only be effected by the pollen of the opposite form. In the long-styled type of L. perenne the styles do not sensibly diverge, but they twist so as to reverse the position of the stigmas, whence the inner surfaces are turned outwards ; thus an insect seeking nectar in the flower brushes against the stigmatic surfaces, and leaves on them the pollen collected from another flower. The facts here recorded demonstrate both the object of dimorphism, and the im- portant part which insects play in the fertilization of plants. Mr. Darwin complains that certain botanists attribute the transport of pollen to the wind and insects indif- ferently, as if there were no important difference between the action of these two agents. Dioecious plants, or even hermaphrodite ones, in the fertilization of which the wind is a necessary auxiliary, present peculiarities of structure fitted for this 156 VEGETABLE PHYSIOLOGY. mode of transport : in some the pollen is powdery and abundant, as in Pines, Spinach, &c. ; tlie pendent anthers of others at the least breath scatter the pollen ; in others the perianth is wanting, or the stigmas project beyond the flower at the moment of fertilization ; in some the flowers appear before the leaves ; and some have feathery stigmas, as Graminece> Mercurialis, &c. Wind-fertilized flowers do not secrete nectar ; the pollen is too dry to adhere to insects, and the corolla is either absent, or possesses neither the colour, scent, nor nectar which attract them. We shall conclude these remarks by mentioning the curious phenomena re- specting the fertilization of Vallisneria spiralis, which grows submerged in stagnant waters in the south of France. It is dioecious, but the male plants always grow near the female ; the female flower, protected by a spathe, is borne on a long peduncle which rises from a tuft of radical leaves ; and the ovary bears three forked stigmas. The male flowers are borne on a very short peduncle, and are sessile on a conical axis enveloped in a spathe. At the flowering period the female peduncle gradually lengthens, so that the flower finally floats on the surface of the water, and opens its perianth of six very minute segments. Then the male flowers, which have hitherto remained submerged, detach themselves spontaneously from their peduncle, and rise to the surface, where numbers of them may be seen floating around the female flower, on which the anthers elastically project an abundance of pollen. After fertilization, the peduncle of the female flower contracts spirally, and the ovary descends to the bottom of the water to ripen its seeds. In describing the anther, we spoke or the fibrous cells which, after the maturing of the pollen, form a layer upon the inner wall ; which layer gets thinner as it approaches the line of dehiscence, where it disappears. At the moment when the pollen is ready to be discharged, the moisture of the anther evaporates, its hygrometrical tissue, pulled different ways by the variations of the atmosphere, produces a strain along the line where the fibrous cells are interrupted, and these by their contraction favour the emission of the pollen. At the same time the cells of the stigma become viscous, so as to retain the pollen projected on to them from the anther, or carried thither by the wind or by insects. Thereupon the pollen swells, through the action of endosmose ; the inner membrane ruptures the outer at one of the points which touch the stigma; the pollen-tube (fig. 413) lengthens, traverses the interstices of the stigmatic cells, and reaches the conducting tissue which fills the canal of the style, and which is charged, like the stigma, with a thick fluid. Still lengthening, the pollen-tube finally enters the cavity of the ovary, traverses the conducting tissue which lines the placentas, and at last reaches the ovule (fig. 750), when it enters the micropyle and comes in contact with the cell of the nucleus (embryonic sac), its tip resting on the membrane of the sac, and partly adhering to it. Soon after this contact of the pollen-tube, one, or oftener two vesicles (embryonic vesicles, fig. 750) usually appear within the embryonic sac, below the tip of the pollen-tube. These vesicles elongate ; the upper and thinner end adhering to the membrane of the sac. While one of the two shrinks and disappears, the other develops, and fills more or less completely with its free end the cavity of the embryonic sac. The embryonic vesicle, which will PHENOMENA OF REPRODUCTION. 157 be developed into the embryo, is at first filled with a transparent fluid, but soon presents transverse septa at the upper contracted part which forms the suspensor ; then a longitudinal septum is formed in the swollen part, which answers to the free end ; 011 which free end is afterwards developed either one lobe, or two opposite lobes (cotyledons), and the opposite end becomes the caulicle. All physiologists concur in the above, but there are different opinions as to the part the pollen plays. Schleiden contended that the tip of the pollen-tube forms the embryo by forcing inwards the membrane of the embryonic sac, folding it around itself, and occupying its cavity, where it speedily develops into the embryo. Thus, according to Schleiden, the ovule is merely a receptacle, destined to receive the embryo, to protect and nourish it, the true reproductive organ residing in the anther. But a closer examination instituted by the most skilful anatomists of the French school has repeatedly disproved the existence of the embryonic vesicle before the arrival of the pollen- tube. Never- theless, it is certain that the pollen ma- 750. CEnothfcra longiflora, Anatropous ovule, cut verti- cally at the moment of ferti- lization, to show the pollen- tube, the end of which is in contact with the embryonic sac ; within, at the top of this sac, are two vesicles, one of which will wither, and the other form the embryo (mag.). I 751. Santalum. 752. Vertical section of fig. 751 Placenta bearing three nuclei, (mag.), showing two of the embryonic sacs within and outside the nucleus. whence issue three embryonic sacs, which receive three pollen-tubes (mag.). 753. Santalum. Portion of nut, cut vertically, to show the embryonic sac which has burst the nucleus at the bottom, and has ascended to the pollen-tube, the free end of which it sheaths (mag.). terially assists in the formation of the embryo by means of its fovilla, which passes by endosmose from the pollen-tube into the interior of the ovule. The fertilization of the ovule in Santalacece presents a quite exceptional phenomenon, which deserves to be mentioned (figs. 751, 752, 753). The ovary is unilocular, and the free central placenta bears several suspended ovules ; each is a naked nucleus (without primine or secundine). At the period of fertilization, the nucleus n bursts at the lower part, the embryonic sac se emerges by this opening and ascends along the whole length of the outer surface of the nucleus, to meet the pollen-tube tp a little below the top of the nucleus. The latter soon withers, and the embryonic sac, which alone grows, forms the integument of the seed. 158 VEGETABLE PHYSIOLOGY. After fertilization flowers rapidly lose their freshness ; the corolla and stamens wither and fall; the style dries up, together with the conducting tissue which filled it, and that portion of this tissue which abutted on the ovule disappears. Soon the ovary, receiving the nourishment which was previously distributed to other parts of the flower, increases, as do the ovules ; many of these become arrested by the overwhelming development of the others, and the number arrested is often constant ; sometimes also the septa disappear. Finally, the fertilized pistil becomes more or less modified in form, volume, and consistency. Maturation. — This marks the period when the changes which take place in the fruit, from fertilization till the dispersion of the seed, are completed. Those fruits which remain foliaceous continue, like the leaves, to decompose carbonic acid and disengage oxygen by day, whilst by night they absorb oxygen and disengage carbonic acid. At maturity their tissue dries, their colour changes, their fibro- vascular bundles separate, and dehiscence takes place. Those fruits which lose their foliaceous consistency and become fleshy respire like the preceding until maturity; then the parenchyma is fully developed, its watery contents are decomposed, and fixed in new combinations ; the cellulose loses some of its carbon and hydrogen, and becomes starch ; and the latter, by the addition of water, is changed into sugar. Vegetable acids are the equivalents of starch and oxygen ; to change these acids into sugar, all that is necessary is either that the carbon assimilated by the plant shall take up their oxygen, or that water shall be formed at the expense of the latter. In most fruits these acids are not entirely converted into sugar, but enter into combination with alkaline bases, thus modifying their acid flavour. The proportions of acid and sugar vary according to the nature of the fruit. When maturation is complete, the fruit disengages carbonic acid formed at the expense of the sugar, and the latter gradually disappears ; but the decomposing fruit, by disengaging carbonic acid around it, inaterialljr contributes to the nourish- ment of the young seed. At complete maturity the fruit breaks up, and the seed thereupon commences an independent existence. Dissemination is the act by which the ripe seeds are scattered over the surface of the earth. In capsular fruits the seeds are freed by the dehiscence of the carpels ; in fleshy fruits they are retained longer. Nature has infinitely varied the methods tending to disseminate seeds : wind, water, and frugivorous animals are the principal agents ; and man himself assists, often unwittingly, by his labours or voyages, in the transport and multiplication of seeds. Germination.— The agents in germination are water, air, heat, and darkness. Seeds buried for many centuries ' in dry soil, preserved from the air and from variations of atmospheric temperature, have been known to germinate and reproduce their species, when placed under favourable conditions. Water softens the integuments, penetrates the tissue of the seed, and is 1 The statements supposed to prove this are not generally trustworthy. — ED. PHENOMENA OF REPRODUCTION. 159 decomposed ; its hydrogen is absorbed ; its oxygen, like that of the air, combines with the carbon of the seed to form carbonic acid, which is set free. Heat is indispensable to germination ; and in the series of phenomena which accompany this process, it acts alternately as cause and effect, for a seed is the theatre of chemical combinations. Light retards germination, by causing the decomposition of carbonic acid, and hence preventing the formation of this gas. Under a combination of favourable circumstances, the seed absorbs water, together with the oxygen of the air ; the albumen, under the chemical action of these agents, loses a portion of its carbon, and at the same time combines with the elements of water ; it soon changes into a saccharine, milky, soluble matter, fit to be absorbed by the embryo;, if the albumen has been absorbed previous to germination, the cotyledons enlarge and nourish the plumule. When the latter has emerged from the ground and become green, the phenomena are reversed ; the young plant, instead of absorbing oxygen to combine with its carbon, and disengaging carbonic acid, absorbs carbonic acid, separates the carbon, and assimilates it. TAXONOMY. TAXONOMY is tlie part of Botany which treats of classification ; i.e. the methodical distribution of plants in groups, named Classes, Families (or Orders), Genera, and. Species. All the individuals or separate beings of the Vegetable Kingdom which resemble each other as much as they resemble their parents and their posterity, form collectively a species. All the species which resemble each other, although differing in certain charac- ters which become the distinctive sign of each, form collectively a genus, which takes the name of the principal species.1 Thus, the Cabbage, the Turnip, the Colza, the Radish, are species of the same genus, which has received the name of Cabbage. As a necessary consequence, each plant belonging to a genus and to a species has received two names, that of the genus and that of the species, i.e. the generic and specific name, and we say the Drum-head Cabbage, the Turnip Cabbage, the Colza Cabbage, the Radish Cabbage. All the genera which resemble each other form collectively a family (or order) ;< thus, the genus Cabbage, the genus Stock, the genus Thlaspi, the genus Cochlearia, belong to the same family, namely that of Cruciferce. Those families which are allied are united into classes ; and thus all the species composing the Vegetable Kingdom are classified. But the species itself may be subdivided : individuals of the same species may be placed under different conditions ; one may vegetate on a barren rock, another in a swamp ; this will be shaded, that torn by the wind ; man himself may intentionally create such differences, and combine them according to his wants. The vegetable under these diverse influences will finally undergo changes in its sensible qualities, such as size of root ; the size, consistency, and duration of stem ; the form, colour, and scent of its floral whorls, the taste of its fruit, &c. But these changes, however con- siderable, will not destroy the primitive character of the species, which will always be discoverable throughout its modifications. A collection of individuals of the same species which have undergone such modifications bears the name of variety. The characters of a variety, depending on accidental causes, are never constant ; as soon as the influencing cause ceases, the change ceases, and the primitive species reappears in its original form. The cultivated Cabbage is an example, of which six 1 This holds only in a limited sense. — ED. TAXONOMY. 161 varieties are known in France : — 1. the Wild Cabbage, which is the primitive type of the species ; 2. the Common Kale, with a long stem and spreading leaves ; 3. the Scotch Kale, of which the leaves are almost in a head when young, then spreading and wrinkled ; 4. the Drumhead Cabbage, of which the stem is short, the leaves green or red, concave, and gathered into a "head before flowering; 5. the Kohl- rabi, the stem of which is swollen and globular below the insertion of the leaves ; 6. the Cauliflower, of which the floral branches are gathered closely together before flowering; the sap enters this inflorescence exclusively, and transforms it into a. thick, succulent, and granular mass, which furnishes an excellent food. Such are modifications induced by cultivation ; they are wholly due to the excessive deve- lopment of the parenchyma, which accumulates, sometimes in the leaves (Drum- head Cabbage), sometimes only at the edge of these leaves (Scotch Kale), sometimes at the base of the stem (Kohl-rabi), and sometimes in the peduncles or floral branches (Cauliflower}. The seed does not preserve the variety ; it always tends to reproduce the primitive type. Nevertheless there are plants of which the varieties are propagated by seed, provided that the conditions which have modified the species be faithfully repeated^ such are the Cereals, which form, not varieties, but races, the original type of which is lost. The older classifiers arranged plants according to their properties or habitats ; others on characters drawn from the stem,, roots, leaves, or hairs. It was at la.st per- ceived that the flower, containing the seed which was to perpetuate the species, and composed of leaves of which the form, colour, number, and connection notably differ in each genus and species, is the part of the plant which ought to furnish the best characters for classification. Hence the flower furnishes the basis of the systems of Tournefort and Linnceus, the method of A. L. de Jussieu, and that of A. P. de Candolle, which is a slightly modified arrangement of De Jussieu's. Tournefort established his system on the consistency of the stem, 011 the presence or absence of a corolla (and he considered every floral envelope which is not green as a corolla), on the isolation or the contrary of the flowers, and on the shape of the petals. This method, which appeared in 1693, and comprised 10,000 species, being based on the most prominent part of the plant, was intelligible and easy of application, and was once universally accepted ; but as the knowledge of species increased, many were found that would not fall into any of its classes, and it was hence abandoned. The system of Linnsous, which appeared forty years after that of Tonrnefort, was received with an enthusiasm which still exists, especially in Germany. He took as the base of his twenty-four classes the characters furnished by the stamens in their relations to each other and to the pistil. 162 TAXONOMY. TABLE OF THE ARTIFICIAL METHOD OF TOURNEFORT. * fpetn ' of herbs < and 2: ehrubs > . LaPe 6 .j /• apel of trees . I 1 pets C regular . | ' monopetalous J •• [ irregular \ ' simple (regular . 1 1 irregular Classes 1 CAMPANIFORM .... 2 INFUNDIBULIFORM . . 3 PERSONATE Examples Belladonna, liindweed. Snapdragon. Sage. Stock. Strawberry. Carrot. Pink. Tulip. Pea. Violet. Thistle. Dandelion. Easter Daisy. Oats. Ferns. Fungi. Laurel. Willow. Elder. Cherry. Robinia. 4 LABIATE " 5 CRUCIFORM 0 ROSACEOUS 7 UMBELLIFEROUS . . . 8 CARYOPHYLLACEOUS . . 9 LILIACEOUS 10 PAPILIONACEOUS . . . 11 ANOMALOUS . . . . 13 FLOSCULOUS . 13 SEMI-FLOSCULOUS . . talous 14 RADIATE 15 STAMINIFEROUS . . . 16 FLOWERLESS . . . . 17 FLOWER- AND FRUIT- LESS 18 APETALOUS 19 AMENTACEOUS . . . . 20 MONOPETALOUS . . . 21 ROSACEOUS . ., . . . 22 PAPILIONACEOUS . . . [ monopetnlous .... iloid . . . J i reninc»toitlft. Crraloefphalus. Flower cut vertically (mag.), Ceraiottphalvs. Young carpel (mag.). Ceratoftphalui. Achene cat verticiill}' (mag.). Ficaria. Vertical section of flower (mag.). CeratocrphaJui. Seed (mug.). Firaria Carj*l (mag.). Ficaria. Stunieu(inag.). Fieariti. Diagram. 'J. Trautvetteria. — Sepals 3-5, concave. Petals 0. Carpels numerous. Acltenes capitate, membranous ; style very short. Embryo rather large. — Herbs frith perennial rootstock. Leaves palmatilobed, cauline few. Flowers in a corymbose panicle. North America and Japan. 10. * Ranunculus. — Sepals 3-5, caducous. Petals as many, or more numerous, with a basal nectariferous pit or scale. Carpels numerous. Achenes in a head or spike, beaked by the short style. — Annual, or oftener perennial herbs. Leaves entire or cut. Flowers white, yellow or red, solitary or panicled. Almost cosmopolitan. — The aquatic species have been made into a separate genus (Batrachiuin) by several modern botanists, on account of their transversely wrinkled achenes, and habitat. Ficaria has been separated, from having three sepals, 6-9 petals, and obtuse carpels ; and Ceratocephalus, because the base of the carpels presents two external gibbosities, and internally two empty cells, and the carpels are further produced into a horn five to six times as long as the seed. 11. Hamadryas. — Flowers dioecious by suppression. Sepals 5-G, caducous or subpersistent. Petals 10-12, with a basal scale. Carpels numerous. Achenes capitate, tipped by the short I. RANUNCULACE.E. 179 stylo. — Low herbs, with perennial rootstock, only differing from Ranunculus in the dioecious flowers. Antarctic America. 12. Oxygraphis Sepals 5, persistent. Petals 10-15, with a basal nectariferous pit. Carpels numerous. Achenes capitate, beaked by the persistent style. — Low herbs, rootstock perennial. Leaves radical, entire. Scapes naked. Flowers solitary, golden-yellow. Mountains of extra-tropical Asia. Tribe IV. HELLEBORES, D.C. — Flowers regular or irregular (Aconitum, Del- phinium). Sepals imbricate, petaloid. Petals small, or irregular and nectariferous, or 0 (Caltha, Hydrastis). Carpels several-ovuled, dehiscent when ripe, rarely berry- like (Actcea, Hydrastis), follicular, free, rarely connate into a several-celled capsule (Nigella). Herbs. Leaves all radical, or the cauline alternate. Calffia. Ripe fruit. Caltha. Stamen (mag,). Caltha. Seed with fungoid chalaza (m'ag.). Caltha. Flower cut vertically. Cat/ha. Pistil and portion of andrceclum. 13. *Caltha. — Sepals 5-x , equal, coloured, deciduous. Petals 0. Carpels few or many, sessile ; ovules many, 2-seriate, follicular when ripe. Seeds obovoid ; testa crustaceous, smooth, "raphe prominent. — Glabrous perennial herbs, tufted, or with a perennial rootstock, Leaves radical, palminerved, entire or crenulate, cordate or auricled, cauline few or 0. Flowers yellow or white, one or few. Stamens and carpels numerous or few. Europe, Asia, America, Australia, New Zealand. 14. Calathodes. — Sepals 5, regular, coloured, deciduous. Petals 0. Carpels numerous, sessile, distinct ; ovules 8-10, 2-seriate near the base of the suture. — A perennial erect herb, N 2 180 I. RANUNCULACE^]. babit of Trollius, Leaves cauline, palmatilobed or dissected. Flowers . yellow, solitary. Eastern Himalaya. 15. Glaucidium. — Sepals 4, regular, deciduous. Petals 0. Carpels 1 or few, sessile, slightly coherent at the base ; ovules numerous, many-seriate along the ventral suture. Follicles square, with dorsal dehiscence. Seeds numerous, oblong, depressed ; testa finely crustaceous ; raphe very prominent, almost winged. — A perennial upright herb. Leaves palmatilobed. Flowers solitary, ample, lilac or pink. Japan. 16. Hydrastis. — Sepals 3, regular, petaloid, caducous. Petals 0. Carpels numerous, sessile, distinct, 2-ovuled, fleshy when ripe, and forming a head, as in Hubus. — A perennial erect herb. Leaves palmatilobed, or dissected. Flowers solitary, small, white. Stamens a little longer than the sepals. North America. Troll int. Seed, entire and cut vertically (inng.) Trolliu*. Petal, inner face (niog.). Trultiut. Stamen (mag.). 17. *Trollius. — Sepals 5-oo , regular, petaloid, de- ciduous. Petals 5-8, small, clawed, rarely oo , long-linear ; blade entire, with a nectariferous pit at the base. Carpels many, free, sessile, many-ovuled, follicular when ripe. Seeds oblong, usually angular; testa crustaceous, rather smooth.— Erect herbs ; rootstoek perennial. Leaves palmati-lobed or -sect. Flowers solitary or few, large, yellow or lilac. Europe, At'tn, Xm-lli America. Trolliut (tiropteui. I. RANUNCULACE.E. 181 18. *Helleborus. — Sepals 5, regular, petaloid or sub-herbaceous, usually persistent. Petals small, clawed, nectariform ; blade furnished at the base with an inner lip, or a scale. Carpels many, sessile or subsessile, distinct or coherent at the base, many-ovuled, dehiscing inwards at the top when ripe. Seeds 2-seriate ; testa crustaceous, shining. — Erect herbs ; rootstock perennial. Leaves palmati-sect or -lobed, or digitate, cauline few, the upper sometimes involucriform or all bracteiform. Flowers large, white, greenish, yellowish or livid, solitary orpanicled. Sepals large. Follicles coriaceous or membranous. Europe and Western Asia. H. nig(r. fi. foctidus. hranthis. Petal. Petal. Petal (mag.) Eranthis. Seed, entire and cut vertically (mag.). Eranlliis hitinalis. H th it. Flower cut vertically. ' Kranlhis. Diagram. 182 I. RANTJNCULACE^. 19. *Eranthis. — Sepals 5-8, regular, petaloid, deciduous. Petals small, nectariform, clawed ; blade furnished at the base with an inner scale-like lip. Carpels many, distinct, stipitate, many ovuled, follicnlar when ripe. Seeds ovoid or sub-globose ; testa crustaceous, smooth. — Low herbs ; rootstock perennial, tuberous. Leaves radical, palmatisect, cauline solitary, amplexicaul beneath the flower or peduncle, segments simulating the whorled leaflets of an involucre. Flower solitary, yellow ; sepals narrow. Europe, ami Mountains of Asia. 20. Coptis. — Sepals 5-6, regular, petaloid, deciduous. Petals 5-6, small, cucullate or linear. Carpels many, stipitate, distinct, many-ovuled, follicular when ripe. Seeds with crustaceous shining testa. — Low herbs; rootstock perennial. Leaves radical, ternately dissected. Scapes naked, 1-3- flowered. Flowers white. Europe, Asia, North America. Ji'jflla satica. Nigella. Stamen (mag.). Itigella. l>i;». -I. ill!. .V. DaiiMtcena. Frnit cut transversely to shew the cells and the spurious cells. 21. *Isopyrum. — Sepals 5-6, regular, petaloid, deciduous. Petals 6, very short, nectari- form or 0. Carpels 2-20, sessile, distinct, 3-oo -ovuled, follicular when ripe. — Slender low herbs ; rootstock perennial. Leaves ternately decompound ; canline alternate or subopposite, or 0. Flowers solitary or loosely panicled, white. Petals variable in form. Stamens some- times reduced to about 10. Europe, Asia, North America. 22. * Nigella — Sepals 5, regular, petaloid, deciduous. Petals 5, clawed ; blade small, 2-fid. Carpels 3-10, sessile, more or less coherent, many-ovuled, opening when ripe at the top I. EANUNCULACE^E. 183 of the ventral suture. Seeds angular ; testa crustaceous or sub-fleshy, often granular. — Erect glabrous herbs. Cauline leaves pinnatisect, segments very narrow. Flowers white, blue, or yellowish, sometimes involucrate with one floral leaf. Europe, Western Asia, Columbine. Pistil and scales (mag.) .Garidella. Columbine. Flower cut vertically (mag.). (.Afuilegia vulgaris.) Columbine. Seed, entire and cut vertically (mag.). vfsriaella, Seed, entire and cut vertically (mag.) Columbine. Flower cut vertically. 184 I. EANUNCULACE^E. 22b. Gai idella. — Sepals 5, petaloid, caducous. Petals 5, 2-labiate. Follicles 2-3, sessile, coherent at the base, and opening at the top ; style very short. Seeds 2-seriate. — Slender herbs. Leaves finely multifid. Flowers small, white. Mediterranean Region. 23. *Aquilegia. — Sepals 5, regular, petaloid, deciduous. Petals 5, like a cornucopia or hood, attached by the margin of the limb, and nectariferous at the base of the cavity. Lower stamens reduced to scale-like staminodes. Carpels 5, sessile, distinct, many-ovuled, follicular when ripe. Seeds with crustaceous, smooth or granular testa. — Erect herbs; rootstock perennial. Leaves ternately decompound. Flowers conspicuous, blue, yellow, scarlet, or parti- coloured, solitary or panicled. Europe, Asia, North America. 24. * Delphinium. — Sepals 5, petaloid, unequal, subcoherent at the base, the posterior turned up in a horn or spur. Petals 2 or 4, small, all sometimes united, the two upper pro- longed into a pointed spur included in that of the calyx ; the two lateral not spurred, or 0. Carpels 1-5, sessile, distinct, many-ovuled, follicnlar when ripe. Seeds subfleshy. — Annual herbs, or with perennial rootstock, erect, branched. Leaves palmatilobed or dissected. larkspur. Andrcecium ami pistil. Larkspur. Flower cut vertically (mng.). Larkspur. (Delphinium contolitla.) Larkspur. Diagram Larkspur. Seed, on tiro and cut vertically (mug.). Ijirkspur. Upper sepal. I. BANUNCULACE^. 185 Flowers rather large, in a loose raceme or panicle, blue, purplish, pink or white, rarely yellow. Filaments sometimes dilated at the base. Europe, Asia, North America. 25. *Aconitum. — Sepals 5, petaloid, unequal ; posterior large, helmet-shaped, covering the corolla ; 2 lateral larger than the 2 anterior. Petals 2-8, small, very unequal, the two upper with long claws, cucullate at the top, hidden under the helmet ; the lower minute, filiform, often 0. Carpels 3-5, sessile, distinct, many-ovuled, follicular when ripe. Seeds with spongy testa, deeply wrinkled. — Erect herbs ; rootstock perennial. Leaves palmati-lobed or -sect. Flowers racemed or panicled, blue, purplish, yellow or white ; pedicels bra-cteolate. Filaments usually dilated at the base. Europe, Asia. Aconite. (Aconitum Napellus}. Aconite. , entire and cut vertically (mag.). Aconite Stamen (mag.). Aconite. Flower deprived of its calyx, petals in a hood, pedieelled. Aconite. Pistil with one stamen (mag.). Aconite. Diagram. Aconite. Flower cut vertically (mag.). 2G. *Actsea.— Sepals 3-5, subequal, petaloid, deciduous. Petals 4-10, small, clawed, spathulate, flat. Carpel solitary, many-ovuled, berried when ripe. Seeds depressed ; testa crustaceous, smooth.— Herbs ; rootstock perennial, fusiform ; stem erect. Leaves ternately 186 I. RANUNCULACE.E. decompound. Flowers small, in short racemes that lengthen after flowering. Stamens longer than the sepals. Stigma sessile, dilated. Europe, Asia, North America. wBSSi o*ff^2& wfiJr<«\*7iQ_QO Actcea. Flower cut vertically (m»g.) l ' i, Aftita. Ail,',/. Stamen (mag.). Seed, entire and cut vertically (mug.). Fruit (mug.). 27. Cimicifuga. — Sepals 4-5, subequal, petaloid, deciduous. Petals 1—8, small, clawed, 2-lobed, or 0. Carpels 1-8, distinct, many-ovuled, follicular when ripe. — Herbs, habit and foliage of Actcea. Flowers small, very numerous, in elongated racemes. Europe, Asia, North America. 28. *Botrophis. — Sepals 4-5, petaloid^ equal. Petals 0. Outer stamens dilated, terminated by an imperfect anther. Carpel solitary, 1-celled; ovules 2-seriate. Follicle substipitate. — Herbs, leaves 2-3-sect, segments incised, toothed. Flowers racemose, white. North America. 29. Xanthorhiza. — Sepals 5, subequal, petaloid, de- ciduous. Petals 5, small, clawed, gland-like, dilated at the top. Stamens 5, alternate with the petals, or 10. Act, rarely definite (Hibbertia, &c.), hypogynous, sometimes unilateral (Hibbertia}, usually free, rarely mon-poly- adelphous (Hibbertia, Candollea} ; anthers introrse or extrorse, cells linear or sub- globose, adnate, often separate and overtopped by the connective, opening vertically or by an apical pore. OVARIES several, distinct or coherent, sometimes solitary (Em- pedoclea, Doliocarpus, Delima, &c.) ; styles terminal or sub-dorsal, divergent ; stigmas simple or sub-capitate; ovules 2 or several, 2- seriate, ascending, raphe ventral, rarely solitary and erect (Schumacheria), anatropous or half-anatropous. CARPELS some- times dehiscing by the ventral or dorsal suture or indehiscent, crustaceous or berried. SEEDS solitary or few, ovoid, arillate (except Dillenia), testa crustaceous, aril pulpy or membranous, cup-shaped, laciniate ; albumen fleshy. EMBRYO minute, straight, basilar; radicle near the hilum, inferior. PRINCIPAL GENERA. CftiidnlliM. Dillenia. Acrotrema. Delima. lliblxrrtin. "VVormia. Tetracera. Ditvilla. Dillfiriacctr are more or less closely alKed to Magnoliaeetr., Anonafete, a»d Ruminculaceee. (See these families.) Dilhtnacetf are chiefty natives of the southern hemisphere. Tropical America and Asia possess about an equal number of species; they are rare in Africa. Dillenia is confined to tropical Asia; Hibbertia and Candollea are specially extra-tropical Australian. Hitherto none have been found in South Africa or tem- perate South America. DiHeniacea are astringent and some are so u?ed medicinally. The fruits of a very few are acidulous; others are reputed tonic stimulants. The leaves of Davilla elliptica, a Brazilian shrub, are vulnerary ; those of Cwatella Cainbaiba, applied to ulcers, are detergent. Tetracera Titjarea, of Guiana and the Antilles, is a sudorific and diuretic ; a decoction of it is given for syphilis ; and a vinous infusion of its seeds is said to be efficacious in intermittent fevers, chlorosis, and scurvy. The astringent baj-k of DHlnria serrata is employed in Asia for ulcerated sores. The acid but uneatable fruit of D. spccioxa serves to season dishes; and a syrup of the juice of the unripe fruit allnys coughs, assists expectoration, and cures angina and aphthfe ; its bruised bark is applied as a cataplasm in arthritis, and, like that of other species, is used for tanning. III. CALYCANTttEjE, LiniU. COROLLA 0. STAMENS numerous, inserted on the calyx. CARPELS numerous, free, inserted ivithin the receptacular tube. EMBRYO dicotyledonous, exalbuminous. STEM woody. LEAVES opposite, exstipulate. SHRUBS with 4-angled stems. LEAVES opposite, petiolate, entire, exstipulate. III. CALYCANTHE^E. FLOWERS g , regular, appearing with the leaves or earlier, terminal or axillary, often sweet-scented or aromatic. CALYX coloured, segments numerous, many-seriate, im- C'himonanthus. Flower. Chiinonanthut. Carpel, entire and cut vertically (mag.). Chimonaiitltus. Flower cut vertically. C/t imonan th tis. Diagram . Chimonanlhus. Flower- bud (mag.). bricate, all alike, or the outer bracteiform and the inner petaloid, rising from a receptacular cup (calyx-tube of old botanists), short, urceolate. COROLLA 0. STAMENS numerous, inserted on a fleshy ring lining the calyx-throat, outer fertile, inner sterile, persistent or deciduous, free, or coherent at the base ; filaments short, subu- late or filiform ; anthers extrorse, 2-celled, ovoid or oblong, adnate, dehiscence longi- tudinal. OVARIES numerous, inserted on the inner wall of the receptacular cup, free, 1 -celled, 1-ovuled; styles as many as ovaries, terminal, simple, filiform or compressed, subulate ; stigmas undivided, obtuse, terminal ; ovules solitary, or rarely two, of which one is smaller, superimposed, ascending from the bottom of the cell, anatropous, 192 IV. MAGNOLIACE^. raphe ventral. ACHENES numerous, included in the receptacular tube, accrescent, herbaceous, sub-fleshy, ovoid or oblong. SEED solitary, upright ; testa membranous. EMBRYO exalbuminous ; cotyledons foliaceous, convolute ; radicle superior. PRINCIPAL GENERA. Chi moiiAii thus. Calycanthus. The affinity of Calycanthea with Myrtacea will be pointed out in the description of the latter. They also approach Granatete in their coloured calyx, the number and insertion of the stamens, the carpels enclosed in the receptacular tube, exalbuminous embryo, convolute cotykdons, woody stem, generally opposite leaves and terminal flowers ; they are distinguished by their apetalous flowers, extrorse anthers, free and one-ovuled ovaries, and dry fruit. They have also aome affinity with Monimiacecp, from their apetalous flowers, two-seriate calyx, numerous stamens inserted on the calyx-throat, numerous free ovaries inserted on the inner wall of the receptacular cup, one-celled and one-ovuled anatropous ovules, simple styles, woody stem and opposite leaves ; but in Moninnncece the flowers are diclinous, the perianth is calycoid, the ovule is pendulous, the fruit is a drupe and the embryo small in a copious albumen. Finally, Calycanthus has been compared with Rosa; but its four-angled stem, opposite exstipulate leaves, sterile stamens and extrorse anthers readily distinguish it. Calycanthus, of which two species are known, inhabits North America ; Chimonanthus grows in Japau. Calycanthea are aromatic, and the bark of Cnlycanthus Jloridus is used in America as a stimulating tonic. IV. MAGNOLIACE^E. (MAGNOLI/E, Jussieu. — MAGNOLIACE.E, D.C. — MAGNOLIE^E ET WINTERED, 13r.) FLOWERS 5 . SEPALS usually 3. PETALS 6-00 , free, kypogynous. STAMENS oo, hypogynous ; anthers adnate. CAKPELS usually oo, distinct or coherent, 1-celled, l-2-oo - ovuled. OVULES anatropous. ALBUMEN copious, not ruminate. EMBRYO dicotyle- donous, straight, minute, basilar. STEM woody. LEAVES alternate. TREES or SHRUBS. LEAVES alternate, simple, coriaceous, entire or rarely lobed (Liriodendron), penninerved, reticulate, sometimes minutely pellucidly dotted ; stipules membranous, convolute in bud, or opposite, rarely 0 (Drimys, Illicium). FLOWERS ? , or very rarely incomplete (TVumuznnta), usually large, terminal or axil- lary, solitary, rarely racemose or fascicled. SEPALS 3, rarely 6, or 2-4, usually petaloid, free, imbricate, deciduous. PETALS 6-00 , inserted at the base of a stipiti- forrn torus, 1-2- oo-seriate, imbricate, deciduous. STAMENS oo, several-seriate, inserted with the petals ; filaments free ; anthers 2-celled, adnate, extrorse (Lirioden- dron, Drimys, Illicium}, or bursting laterally, or introrse (Magnolia, Talauma, Michelia, &c.), dehisceiice longitudinal or transverse (Tasmannia). OVARIES oo or few, sometimes many-seriate in a head or spike, free or rarely coherent (Manglietia), sometimes whorled at the top of the receptacle (Illicium), always 1-celled ; styles con- tinuous with the ovary, stigmatiferous within and near the top ; ovules on the ventral suture, either 2, collateral or superimposed (Magnolia, Liriodendron}, or more and 2-seriate (Michelia, Manglietia) ; pendulous, rarely erect at the base of the cell, and solitary (Illicium), anatropous. FRUIT various: carpels subpedicelled, free or coherent, either 2-valved and capsular, with dorsal or ventral dehiscence (Mag- IV. MAGNOLIACE^E. 193 Magnolia. Anther. Magnolia. Transverse section of seed, showing the rapkie (white).. Magnolia purpurea.. Magnolia. Fruits and seeds suspended outside the pericarp. M. purpurea. Flower cut vertically. Magnolia. Diagram. Magnolia. Seed with fleshy testa, cut vertically (mag.). Illicium. Carpel cut vertically. O Illicium. Ripe carpel, entire and open (mag.) 194 IV. MAGNOLIACE^. lllicium. Fruit. niieium. Seed with crnstaceons testa, cut vertically (mag.). Tasmannia. Flower (mag.). Ttismannia. Calyx and pistil cut vertically. nolia, Michelia, Manglietia, lllicium), or indehiscent and fleshy (Drimys), or woody and breaking transversely at the base (Talaumd), or a samara (Liriodendron). SEEDS sessile or funicled, often suspended outside the pericarp (Magnolia) ; testa fleshy (Magnolia) or crustaceous (lllicium). EMBEYO minute, straight, at the base of a fleshy copious albumen ; radicle and cotyledons very short. Tribe I. MAGNOLIE^J, D.C. — Flowers $ . Carpels imbricate, many-seriate, in a head or spike. — Stipules enveloping the leaves. Talauma. PRINCIPAL GENERA. Magnolia. Liriodendron. Michelia. Tribe II. ILLICIE-S, D.C. — Flowers $ or polygamous. Carpels whorled and 1-seriate, or solitary. — Leaves minutely pellucidly dotted, exstipulate. PRINCIPAL GENERA. Drimys. lllicium. Taauinnuia. Tribe III. TuocHODENPRE.*,1 Benth. et Hook. fil. — Sepals and petals 0. Flowers polygamc-dkecious. Carpels whorled, 1-seriate. Trochodendron. GENERA. Euptelea. Cercidiphyllum. Magnoliacece, which are very near Schizandreee, Anonaceee and Myrusticeai (see these families), are equally connected with Dilleniacete, by their hypogynism, testivation, polyandry, adnate anthers, free ovaries, anatropous ovules, capsular fruit, albuminous seed, straight minute basilar embryo, woody stem and alternate leaves. DUleniacece differ only in the quinary flowers, the often unilateral and polyadelphous stamens, the erect or ascending ovules, and the arillate seed. Mugnoliacece also approach Ranunculacece ; through Dilleniacece ; but are easily distinguished by their habit. Magnolie.ee are chiefly North American ; they are also numerous in subtropical Asia, Japan and India. Illicieee are scattered over America, Eastern Asia, Australia, New Zealand, and the Moluccas. The properties of Magnoliacea resemble those of Anonacece, but their leaves and bark are more intensely bitter, owing to extractive resinous principles. The pericarps and seeds contain a fixed oil, with an often acrid aroma. The fruits are rarely eatable, but many are tonic and stimulant, and are sometimes used as condiments. Michelia Champaca is cultivated throughout tropical Asia, on account of ita sweet-scented 1 This tribe, which embraces three species of very anomalous structure, has been added to Magnoliacea by Bentham and Hooker fil. (Gen. PI. i. 954). Euptelea contains two species, one Assamese, the other Japanese Trochodendron one, and Cercidiphyllum two, all from Japan. — ED. V. SCHIZANDRE^E. 195 flowers, which, however, become foetid as they wither ; all parts of the tree are aromatic, bitter, and acrid ; an infusion of its powdered bark is a powerful emmenagogue ; its young buds are administered in urethritis, and its powdered leaves are recommended for gout, and are applied as a lotion in rheumatic and arthritic pains ; lastly, its seeds, which contain a very acrid substance, are rubbed, with ginger and galenga, over the region of the heart, to cure infantile infer mittents. The bark of Talauma (Aromadendron) elegans is a renowned stomachic in Java ; its slightly bitter leaves are antispasmodic and antihysteric. Of the Asiatic deciduous-leaved species, Magnolia Yulan has been cultivated from time immemorial in China, and its very bitter seeds used as a febrifuge ; and the Himalayan M. Campbellit, a lofty tree with large red flowers, is one of the most splendid plants hitherto discovered. The principal American species are M. grandiflora, auriculata, and macrophylla, of which the bitter and slightly aromatic bark is a tonic. The fruit and seeds of M. glauca and acuminatn are stimulants. The bitter, pleasantly aromatic bark of the Tulip-tree (Zm'o- dendron tulipifera\ which attains a height of 100 feet in North America, is regarded as an excellent sub- stitute for cascarilla and quinine. In Uliciece, which, from their punctate pellucid leaves and 1-seriate whorled carpels, rather form a distinct order than a tribe of Magnoliaceee, the aroma of the volatile oil and resin supersedes the bitterness, and gives them stimulating virtues ; as in Drimys Winteri of Antarctic America, D. Granatensis of New Granada, D, axillaris of New Zealand, the Tasmannias of Australia, and especially the ' Badiane ' (Illicium anisatwri), a Chinese shrub, the fruit of which, called Star Aniseed from its smell and whorled carpels, is a powerful stimulant, which enters into the composition of Dutch aniseed cordial. /. religiosum, transported from China to Japan, and perhaps only a variety of the latter, possesses the same properties, but in an inferior degree. V. SCHIZANDRE& (SCHIZANDRE^E, Blume. — MAGNOLIACEARUM tribe III., Benth. et Hook. //.) Sarmentose glabrous SHRUBS, with mucous juice. LEAVES alternate, simple, penninerved, entire or toothed, sub-coriaceous, often pellucidly dotted (Schizandra), exstipulate. FLOWERS diclinous, axillary, solitary, small, usually scented. PERIANTH ternary, multiple ; sepals and petals hypogynous, 9-12-15, 3- oo-seriate ; passing gradually from the small outer to the petaloid inner. FLOWERS $ : STAMENS oo, or 5-15, distinct, or united into a globular mass ; filaments very short, thick, free or coherent ; anthers adnate, cells short, rounded, more or less separated by the connec- tive. FLOWERS ? : CARPELS oo, in a head (Kadsura) or spike (Schizandra) ; stigmas sessile, decurrent on the inner edge of the ovary; ovules 2-3, superimposed, pendulous, anatropous. BERRIES indehiscent. SEEDS sunk in pulp ; albumen oily, copious. EMBRYO minute, straight, basilar j cotyledons divaricate j radicle near the hilum, oblong, superior. PKINCIPAL GENERA. Schizandra. Kadsura. This little family, annexed by Bentham and Hooker fil. to Magnoliacece, is in fact only distinguishable from them by its climbing stem, exstipulate leaves, diclinous flowers, and fleshy 2-3-seeded carpels. It also approaches Menispermecz, Lardizabaleee, and Anonacece (see these families). Schizandrece inhabit Eastern temperate and tropical Asia ; one species grows in the warm regions of North America. The mucilaginous berries of some are eatable, but tasteless. o 2 196 VI. ANONACE^. Sehuandi-a coccinea Schitandra, Fruit. VI. ANON ACE ^E. , Jussieu. — GLYPTOSPEKM^E, Ventenat. — ANONACE^E, DuncU.) FLOWERS $ . SEPALS 3. PETALS usually 6, 2-seriate, hypogynous, most often valvate. STAMENS oo, rarely definite, hypogynous [on a large torus — ED.],, many- seriate ; anthers adnate. OVARIES usually many, distinct, 1—2— cc-ovuled ; ovules erect or ascending. FBTJIT a capsule or berry [very rarely capsular — ED.] . ALBUMEN ruminate. EMBEYO minute, basilar. TKEES or SHRUBS, sometimes climbing, generally aromatic, with acrid juice. LEAVES alternate, distichous, plaited in vernation, simple, entire, penninerved, pubescent when young ; petiole usually jointed or swollen at the base ; stipules 0. FLOWERS ?, rarely diclinous, solitary, or fascicled on axillary peduncles, rarely lateral or leaf-opposed ; corolla membranous, coriaceous or fleshy, greenish purple or VI . ANONACE^]. 197 Asimina. Flower cut vertically (mag.). Asimina. Very young carpel, entire and cut vertically. Asimina triloba. Asimina. Transverse section of anther. Asimina. Transverse section of carpel (mag.). Asimina. Seed , entire and cut vertically. Asimina. Adnate anther, dorsal and ventral face (mag.). Asimina, Pollen-grain. Asimina. Embryo. Asimina'. Fruit. 108 VI. ANONACE^E. yellowish. SEPALS 3, rarely 2 (Disepalum), distinct or united at the base, or coherent in a 3-lobed or -toothed calyx (Cyathocalyx), valvate or imbricate in bud. PETALS usually 6 2-seriate, rarely 4 2-seriate (Disepalum), or only 3 1-seriate (Unona), rarely coherent (Hexalobus), hypogynous, valvate, or rarely imbricate in bud. STAMENS in- definite, multi- seriate on a thick torus ; anthers adnate, 2-celled, cells dorsal or lateral, opening by a longitudinal slit, contiguous or separate, usually concealed by the overlapping dilated tops of the connectives ; rarely definite, with the anthers not concealed by the connective, hardly or not at all dilated (Miliusa, Orophea, Bocagea, &c.). CARPELS oo, rarely definite (Asimina, Xylopia, Bocagea, &c.), or solitary (Cyathocalyx), distinct, or rarely coherent (Anona, Monodora), sessile on the top of the torus ; style short, thick, or 0 ; stigma thick, capitate, or oblong, some- times furrowed or 2-lobed or radiate (Monodora) ; ovules 1-2, erect, basilar, or 1-oc, fixed either to the suture, or very rarely all over the walls of the ovary (Monodora), anatropous, raphe ventral, micropyle inferior. Ripe CARPELS sessile or stipitate, distinct, or united into a oo-celled fruit (Anona), or 1-celled (Monodora), dry, fleshy or pulpy, indehiscent or 2-valved. SEEDS with copious ruminate albumen. EMBRYO minute, basilar ; radicle near the hilum, inferior. PRINCIPAL GENERA. 'Uvaria. Hexalobus. Popowia. Rollinia. Ellipeia. Unona. Oxymitra. •Anona. Guatteria. •Asimina. Goniothalamus. Melodorum. Duguetia. Polyalthia. Mitrephora. Xylopia. Artabotrys. Anaxagorea. Monodora. Miliusa. Orophea. Alphonsea. Bocagea. 'Eupomatia. The genus Eupomatia, which is closely allied to Anonaceai, presents remarkable anomalies of structure. Sepals and petals united into a conical mass, inserted on the upper edge of a turbinate torus, from which it is transversely separated like an operculum. Stamens numerous, perigynous; inner many-seriate, sterile, petaloid ; outer few-seriate, linear-lanceolate : connective longer than the anther-cells, acuminate. Ovary inferior, buried in the torus, and composed of several thick carpels ; ovules numerous, inserted on the ventral suture ; styles connate, terminated by a plane stigma, hollowed into as many areolae as there are carpels. Fruit a truncate berry, crowned by the margin of the torus. Seeds angular. — The- sterile inner stamens are connivent, and very closely imbricate over the stigma, which are thus shut off from communication with the outer fertile stamens, rendering fertilization impossible ; but, as R. Brown observed, they are gnawed by insects, whose introduction thus assists the transport of the pollen to the stigma. AnomacecK are near Myristicete (see this family). They approach Schizandreee, Lardizabalea: and Mcni- spermetK in the ternary arrangement of the calyx and corolla, hypopetalism, extrorse anthers, berried fruit, copious albumen, basilar 'embryo (at least in Lardizabalea and Schizandrea;) , alternate leaves and axillary flowers ; but in Schizandrea the flowers are diclinous, the aestivation imbricate, the ovules pendulous, the radicle superior, and the albumen is not ruminate. The affinity with MaanoUacea rests on the same features, and the diagnosis on the same differences ; besides which, in the latter, the leaves are stipulate, and the seeds have generally a fleshy testa (Magnolia). Anonacea are also near Dilleniacea in hypo- petalism, polyandry, adnate anthers, polygyny, erect anatropous ovules, copious fleshy albumen, basilar embryo, woody stem and alternate leaves; but in Dilletiiaceee the leaves are sometimes stipulate, the flowers are terminal and quinary, the aestivation is imbricate, and the albumen is not ruminate. Anonacea are nearly all tropical. Some (Asimina) reach 33° N. latitude in America. Asia and America possess about the same number of species ; somewhat fewer are met with in Africa. Anona and Rollinia have not yet been observed in Asia. Several Ananas inhabit Africa. VII. MENISPERME^. 199 The bark of Anonacecc is usually more or less aromatic and stimulating; in some species the taste is acrid and almost nauseous ; the leaves possess similar but less powerful properties, the fruits are aromatic and hot (Xylopid), or nearly inodorous, and these alone are eatable. The Malayans use the bark of several Anonacetiar. Amlra-cumi and pistil. Nttphar. Fruit. White WHter-Lilr. Part of flower. X. 209 SUB-ORDER I. NYMPH JE ACE JE. (HYDEOCHARIDUM genera, Jussieu. — NYMPH^EACE^E, Salisbury.} SEPALS 4-6. PETALS oo, plnri- seriate, hypogynous (Nuphar) or perigynous, i.e. inserted at different heights on the torus enveloping the carpels (Nymphcea), or epigynous, i.e. inserted on the top of the torus (Ewryale, Victoria, Barclay a), the inner narrower than the outer, and passing gradually, in some genera, into stamens (Nymphcea, Victoria). (In Barclay a the coherent bases of the petals are inserted on the top of the torus which envelops the carpels, the calyx remaining free.) Filaments often flattened (especially the outer) and sub-petaloid, usually prolonged above the anthers. CARPELS whorled, coherent, and forming a several-celled superior ovary (Nuphar), or half- inferior (Nym- phcea), or inferior (Victoria, Euryale, Barclay a); styles connate into a peltate radiating stigma, longer *than the torus, sessile or stipitate,' more or less Base of the seed, showing the embryo^nveloped by the albumpn (mag-.). Caliomba. Fruit. Cabomba Carolinaria. Cabomba. Vertical section of a carpel (mag.). Cabomba. Seed, entire and cut longitudinally (mag.). 210 X. depressed in the middle, with sometimes a central umbilicate gland (Nymphcea) ; ovules usually numerous, inserted on the walls of the septa. FRUIT a several- celled berry, bursting irregularly when ripe, rarely separating into distinct carpels. SEEDS often furnished with a saccate pulpy aril (Nymphcea, Euryale) ; albumen farinaceous. GENERA. Nuphar. *Nymphw«. Barclaya. * Euryale. 'Victoria. SUB-ORDER II. CABOMBE31. (CABOMBEJE, Richard. — HYDROPELTIDE^E, D.C. — CABOMBACE^B, Asa Gray.) SEPALS 3-4. PETALS 3-4, hypogynous, persistent. STAMENS 6, 12, or 18 ; filaments subulate ; anthers extrorse or lateral. OVARIES 3-2-4, or 6-18, free, whorled, inserted on a narrow torus, narrowed into styles, stigmatiferous at the top (Cabomba), or throughout their length (Brasenia) ; ovules 2-3, pendulous. Ripe CARPELS enclosed in the persistent calyx and corolla, often solitary by arrest, follicular, indehiscent. SEEDS with a fleshy copious albumen. GENERA. Cabomba. Brasenia. SUB-ORDER III. NEL UMBONE&. (NELUMBONE^E, Bartling. — NELUMBIACE^E, Lindl.) SEPALS 4-5. PETALS and STAMENS oo, hypogynous, several-seriate at the base of the torus ; filaments filiform, dilated above ; anthers introrse, connective prolonged beyond the cells as a flat or clubbed appendage. OVARIES several, sunk separately in the pits of a fleshy, obconic, flat-topped torus ; style short ; stigma terminal, sub- dilated ; ovules 1-2 in each ovary, pendulous from a basilar funicle, which ascends along its wall, and is free above ; raphe dorsal. NUCULES sub-globose, indehiscent. SEEDS exalbuminous, testa thin, EMBRYO floury, plumule foliaceous. GENUS. Nelumbium. NympJieeuiece approach the polypetalous hypognous apocarpous families, although the principal genera are syncarpous, and the ovary is adherent to the torus. The sub-order of Nymphceacece is allied to Papaveracece in the many-oyuled ovary with placentas on the septa, radiating stigmas, polyandry, and truly milky juice; but is distinguished by its frequent perigynism or epigynism, aquatic habitat, and especially the embryo with its enveloping sac being immersed in a superficial cavity of the amylaceous albumen ; the latter is almost the only character which distinguishes Cabombece from Ranunculacece. Nymphceacece have also a real affinity with Sarraceniacea (see that order). The species of Nymphcea are dispersed over nearly nil regions ; Nuphar is confined to the extra-tropical northern hemisphere ; Barclaya and Euryale inhabit tropical Asia ; Victoria, equatorial America. The three or four species of Caboinbece are American ; Brasenia is also found in India and Australia. {Nelumbium inhabits the southern United States, tropical Asia, Africa, and Australia. — ED.] Some species of this family were venerated by the ancients, not only for the magnificence of their flowers and leaves, carpeting the surface of the tranquil waters, but also on account of their utility. Their young rootstocks contain abundance of starchy, mucilaginous and sugary matters, which render them X. 211 Nelumbium lutevm. Leaf, flower, and carpels stmk in an alveolate receptacle. Nelumbium. Fruit, entire and cut. Nelumbium. Vertical section of receptacle and carpels. Nelumbium. Pistil, entire and cut (ma Nelumbium. Plumule with coiled leaves (mag.). ffielumbium. Anther (mag.). nutritive ; in the adult rootstock these principles are replaced by gallic acid. The flowers, which have a peculiar scent, are narcotic. The seeds, filled with a floury albumen, are edible ; the negros of Nubia use them- as millet, and the Egyptians still eat the seeds and rootstock of Nymphcca Lotus and ccerulea. N. alba is the greatest ornament of still waters in the northern hemisphere ; its mucilaginous and somewhat acrid rootstock is administered in some countries for dysentery, and its flowers are reputed to be anti-aphrodisiac. Nuphar lutcum is indigenous, like the preceding; its flower exhales an alcoholic odour, and is said to have the same soothing properties as Nymphteo ; its leaves are astringent, and are given in Germany in cases p 2 Nelumbium. Embryo with spreading lobes (mag.). Nelumbium. Embryo, one lobe re- moved to show the plumule (mag.). 212 XL SARRACENIACE^E. of haemorrhage ; it is also used by nurses to reduce the secretion of milk, and its rootstock is eaten in Russia and Finland. The same is the case with the rootstock and seeds of Euryale ferox, a native of India, and cultivated in China under the name of Kiteou. The Marnru, dedicated to the Queen of England ( Victoria regui), is the most beautiful of the NympJueacca ; it inhabits the tranquil waters of the lagunes formed by the overflow of the large rivers of South America. Its leaves are floating and peltate, their circular blade is 12-15 feet in girth, and its edge 2^-6 inches high; the upper surface is of a brilliant dark green, the under of a red brown, furnished with large reticulated prominent cellular ribs, full of air, and bristling, like the petiole and peduncle, with elastic prickles. The flowers, which rise a few inches above the water, are more than 30 inches in circumference : at first of a pure white, in twenty-four hours they successively pass through pale pink to bright red ; they exhale an agreeable scent during the first day of their blossoming ; at the end of the third day the flower withers and sinks into the water to ripen its seeds. The fruit, which is inferior, attains when ripe the size of a large depressed apple, covered with prickles. The seeds, which are known in the province of Corrientes as water maize, are rich in starch, and are roasted by the natives, who consider them excellent food. Brnsenia pcltata is used in North A merica as a mild astringent. Nektmbium speciusum was the Lotus of the Egyptians ; its leaves, peltate and saucer-shaped, are represented on their monuments and the statues of their gods; its pink flowers resemble enormous tulips, and its fruit-bearing peduncles served as a model for the columns of their buildings. This species grows in several parts of Asia, as far as the mouths of the Volga, but is no longer met with in Egypt ; its seeds, formerly called Egyptian beans, still serve as food to the Indians and Chinese, who also use its petals as an astringent. N. lutetim inhabits the large rivers of Louisiana and Carolina. XI. SARRACENIACEJZ, Endlicher. Perennial HERBS, inhabiting the turfy spongy bogs of North America and Guiana. ROOT fibrous. LEAVES all radical, with a tubular or amphora-shaped petiole ; blade small, rounded, usually lying on the orifice of the petiole. SCAPES naked, or fur- nished with a few bracts, 1 -flowered (Sarracenia, Darlingtonia), or terminated by a few-flowered raceme (Heliamphora). FLOWERS large, nodding. SEPALS 4-5, free, very much imbricated at the base, sub-petaloid, persistent. PETALS 5, free, hypo- gynous, imbricate, deciduous, rarely 0 (Heliamphord). STAMENS oo, hypogynous, free ; filaments filiform ; anthers 2-celled, versatile, opening by 2 longitudinal slits. OVARY free, 3-5-celled, placentas prominent at the inner angle of the cells ; style terminal, short, sometimes dilated at the top, as a 5-angled or -lobed petaloid parasol with 5 radiating nerves (Sarracenia), or 5-fid, lobes narrow, spreading, reflexed, stig- matiferous (Darlingtonia), or obtuse and terminated by an obscurely 3-lobed stigma (Heliamphora) ; ovules numerous, many-seriate, sub-horizontal, anatropous, raphe lateral. CAPSULE 3-5-celled, loculicidally 3-5-valved. SEEDS oo, 'small; testa crustaceous, sometimes loosely reticulate (Darlingtonia), or membranous and winged (Heliamphora) ; albumen copious, fleshy, EMBRYO minute, near the hilum. GENERA. Sarracenia. Darlingtonia. Heliampbora. This little family approaches Papaveraccts in hypopetalism, polyandry, numerous ovules, cnpsular fruit, fleshy copious albumen, and minute basilar embryo ; but Papaveraceee differ much in habit, proper juice, caducous dimerous calyx, and one-celled ovary with parietal placentation. Sarraceniacea are con- nected with Nymphccncea by the same characters, and also by the always radical leaves, one- flowered XL SAEEACENIACE^E. 213 Sarracema. Pistil cut vertically (mag.) Darlington la calif arnica. Germinating embryo. Sarracenia. Seed with prominent raphe, entire and cut vertically (mag.). Karraeenia. Diagram. Sarracenia . Fruit, entire and cut transversely. Sarracenia. Darlingtonia. Pistil and part of andrcrcium. Seed, entire and cut vertically (mag.). 214 XII. PAPAVERACE^. scape, and aquatic habitat ; but Nymphteaceee differ in their numerous several-seriate petals, placentation, sessile stigma, and double albumen. Certain affinities or analogies have also been indicated, which link Surraceniacea with Droseracea, Pyrolacets, Nepenthes, and Cephalotea, [All are natives of America, and chiefly of the United States. Dnrlingtonia inhabits the Rocky Mountains, and Heliamphora the Roruma Mountains of Venezuela. Of the properties of Sarraccniaccee little is known. Sarracenia ntbra has been vaunted in Canada as a specific against small-pox, but has not proved such. The pitcher-shaped leaves are effective insect traps : a sugary secretion exudes at the mouth of the pitcher, and attracts the insects, which descend lower in the tube, where they meet with a belt of reflexed hairs, which facilitate their descent into a watery fluid that fills the bottom of the cavity, and at the same time prevent their egress. — ED.] XII. PAPA VEEACE^E, Jussieu. Poppy. Vertical section of flower (mag.). Poppy. (Paparer Rtueas.) Poppy. Fruit. Poppy. Diagram. Poppy. Poppy Seed, entire and cut vertically (mag.). Flower-bud (mag.). Poppy. Transverse section of ovary (mag.). Poppy. Pistil (mag.). XII. PAPAVERACE^E. 215 Glaucium. Diagram. Olaudum flavunt. Glaucium. .Seed, entire and cut vertically (mag.). Olaudum. Flower cut vertically. Crossosoma. Diagram and part of flower. Meconopsis. Seed, entire and cut vertically (mag.). Platystemon. Aggregated carpels. •> 216 XII. PAPAVERACE^. Clulidonium. Flower cut vertically (mag.) Etch$cttollzia. Fruit. Etc/i icholtzia. Flower without the petals, cut vertically (mag ). Est-hicholtiia. Flower-bud and pistil. Roemeriii. Seed, entire and cut vertically (mag.). SEPALS 2, rarely 3. PETALS double or multiple the number of the sepals, free, regular, usually hypoyytwus. STAMENS oo, hypogynoiw, free. OVAKY \-celled, with XII. PAPAVERACE^l. 217 parietal placentas, many-ovuled. FRUIT capsular or siliyuose. SEEDS albuminous. EMBRYO minute, basilar. — STEM herbaceous. LEAVES alternate. Annual or perennial HERBS, rarely suffrutescent (Bocconia, Dendromecon) ; juice milky, yellow, white, or red, rarely watery (Eschscholtzia, Hunnemannia, Platystemon, &c.). LEAVES alternate, simple, penninerved, toothed or pennilobed. INFLORES- CENCE terminal ; peduncles usually 1-flowered, rarely bearing an umbellate cyme (Chelidonium) or panicle (Bc-conia, Macleya). FLOWERS 5 , regular, yellow or red, very rarely blue (Meconopsis Wallichii, &o.). SEPALS 2 (rarely 3), free, or very rarely coherent into a cap (Eschscholtzia) , lateral, overlapping each other, caducous. PETALS hypogynous, very rarely perigynous (Eschscholtzia), equal, free, usually double the number of the sepals, rarely 8 or 12, 2-3-seriate (Sanguinaria) , rarely 0 (Bocconia, Macleya), often crumpled before expansion, the outer equitanton the inner. STAMENS hypogynous, very rarely perigynous (Eschscholtzia), free, usually oo many- seriate, rarely 4-6 1 -seriate (Platystigma, section Meconella) ; filaments filiform ; anthers 2-celled, basifixed, dehiscence longitudinal. CARPELS connate into an ovoid or oblong 1- celled ovary ; placentas 2- oo, parietal, sometimes prolonged into vertical incomplete septa (Papaver), sometimes marginal and filiform (Chelidonium, Argemone, Roemeria, &c.) ; style short or obsolete ; stigmas as many as placentas, persistent, more or less connate, sub-sessile, or arranged in rays on the surface of an orbicular disk formed by the styles, and which crowns the ovary (Papaver) ; ovules anatropous, ascending or horizontal, micropyle inferior, raphe superior or lateral. Ripe CARPELS very rarely distinct (Platystemon), generally connate into a capsule, or one-celled siliqua, rarely 2-celled owing to a cellular development of the placentas (Glaucium) ; opening- cither by valves between the placentas (Papaver), or in two or four valves separating from below upwards (Chelidonium), or from above downwards, leaving the placentas exposed (Glaucium, Stylophorum) ; rarely fleshy when young (Bocconia, Sanguinaria) . SEEDS usually numerous, rarely definite (Macleya), or solitary (Bocconia), globose or ovoid, sub-reniform (Papaver), or crested along the raphe (Chelidonium, &c.) or not ; albumen copious, oily. EMBRYO minute, basilar ; radicle near the hilum and centri- fugal. PRINCIPAL GENERA. * Platystemon. Platystigma. * Papaver. * Argemone. * Meconopsis. Stylophorum. * Sanguinaria. * Bocconia. * Glaucium. Rcemeria. * Chelidonium. Hunnemannia. * Eschscholtzia. Dendromecon. Papaveraceee are closely allied to Fumariaceee, which are only distinguished by their irregular petals, their definite, usually diadelphous stamens, and their non-oleaginous albumen. They approach Cmciferee in their flower formed on the binary type, in hypopetalisin, parietal placentation, capsular siliquose fruit, polyandry (Megacarpad) , and oily seed ; but Crueiferee are usually tetradynamous, their ovary is two- celled, their ovules are campylotropous, and their seed exalbtiminous. Papavcracete are also near Ranunculacece, Berberidece, and NympJueacece (see these families). One monotypal California!! genus, Crossosoma, placed among JRanunculaceee, approaches Papaveracece in its monosepalous calyx, polyandry, perigynous petals and stamens (as in Eschscholtzia), and in the separation of the carpels (as in Platystemon} ; it differs in its isomerous calyx and corolla, and multifid aril enveloping the seeds. Papaveraeece inhabit the temperate and subtropical regions of the northern hemisphere ; but few are met with in the tropics or southern hemisphere. Some species are now dispersed over cultivated ground through- out the world. The most important of the Papaveraeece with milky juice is the Papaver somnifemm, an 218 XIII. FUMARIACEjE. annual herb, a native of Asia. Its juice, obtained by a superficial incision of its capsule, and thickened by exposure, is ojriutn, a substance containing several principles, and notably an alkaloid (morphine), whose powerful properties render this one of the most valuable of drugs. Taken in a large dose, it is a deadly poison ; but habit rapidly weakens its action, and by degrees considerable quantities can be swallowed with impunity. Orientals, and especially the Chinese, drink, chew, or smoke opium to procure intoxica- tion, the daily renewal of which becomes a want, which they satisfy at any price ; when they soon fall into a state of physical and moral degradation, from which nothing can rescue them. In the north of France a variety of P. somnifennn is largely cultivated, the seeds of which are blackish when ripe, and yield by expression a bland oil, used like olive oil, and known as white oil and o/eolutn. The petals of the Field-Poppy (P. Jthceas) are mucilaginous, emollient, and slightly narcotic. Chelidonhtm majus is a perennial herb, found in cultivated spots. The yellow and acrid milky juice, which fills all parts of the plant, is used in Europe to destroy warts and to remove specks on the cornea; it is regarded in Brazil,1 either rightly or wrongly, as efficacious against the bite of venomous serpents. The juice of Argemone me.ricfina possesses, it is said, the same virtues. The root of STD HOOKER FIL. Series A. — Siliqua long or short, dehiscent throughout its length. Valves con- tinuous within, rarely septiferons, plane or concave, not compressed, in a perpendicular direction to the plane of the septum. Septum the same breadth as the valves. TRIBE I. ARABIDE^E. — Siliqua narrow, long, seeds often 1-seriate. Cotyledons accuinbent. Matthiola, Cheiranthus, Atelanthera, Nasturtium, fiarbarea, Ardbis, Car- damine, Lonchopliora, Anastatica, &c. TRIBE II. ALYSSINE^E. — Siliqua often short, large, seeds 2-seriate. Cotyledons accumbent. Lunaria, Farsetia, Aubrietia, Vesicaria, Alyssum, Draba, Erophila, Coch- learia, &c. TRIBE III. SISYMBRIE^;. — Siliqua narrow, long, seeds often 1-seriatc. Cotyle- XIV. CEUCIFEE^E. 220 dons incumbent, straight or coiled, or transversely folded. Schizopetal/um, Hesperis, Malcolmia, Streptoloma, Sisymbrium, Conringia, Erysimum, Heliophila,, &c. TRIBE IV. CAMELINE^E. — Siliqua short or long, oblong, ovoid or globular. Seeds 2-seriate. Cotyledons incumbent. Stenopetalum, Braya, Camelina, Tetrapoma, Subularia, &c. TEIBE V. BRASSICE^E. — Siliqua short or long, dehiscent throughout its length, or at the top only. Cotyledons folded longitudinally. Brassica, Sinapis, Erucas- trum, Hirschfeldia, Diplotaxis, Eruea, Moricandia, Vella, Carrichtera, Suceovia, &c. Series B, — Siliqua short, dehiscent throughoiit its length. Valves continuous within, very concave, compressed in a direction perpendicular to the plane of the septum. Septum usually very narrow. TRIBE VI. LEPIDINE^B. — Cotyledons incumbent, straight or bent, or condupli- cate longitudinally, or coiled upon themselves. Capsella, Senebiera, Lepidium, jfflthionema, Gampyloptera, &c. TRIBE VII. THLASPIDE^E. — Cotyledons accumbent, straight. Oremolobus, Bis- cuteila, Megacarpcea, Thlaspi, Iberis, Teesdalia, Hutchinsia, Iberidella, &c. Series C. - Siliqua short (rarely long), indehiscent, not jointed, often crustaceous or bony, 1-celled, 1- (rarely 2-) seeded, or 2-4-celled with parallel 1-seeded cells. Pedicels often very slender, drooping in fruit. Seed often furnished with a thin albumen ; testa not mucilaginous. TRIBE VIII. ISATIDE^E. — Characters of the series. Peltaria, Clypeola, Tsatis, Tauscheria, Nestia, Calepina, Myagrum, Euclidium, Bunias, Zilla, &c. Series D. — Siliqua transversely 2-jointed, short or long ; lower joint indehiscent, empty or longitudinally 2-celled, 2- oo-seeded ; upper joint indehisceut, 1-celled, 1-seeded,, .or 2- oo-celled, with parallel or superimposed cellules. — Siliqua always upright or nearly so, pedicel straight. TRIBE IX. CAKILINE^E. — Characters of the series. Crumbe, Huricaria, Rapis*- trum, Cakile, Enarthrocarpus, Erucaria, Morisia, ,&c. Series E. — Siliqua long, not jointed, indehiscent, cylindric or moiiiliforiii, 1- celled, many-seeded, or with several 1-2-seriate, 1-seeded cellules, separating when ripe. TRIBE X. EAPHANE^E. — Characters of the series. Raphanus, Raffenaldia, Anchonium, Parlatoria, &c. A Cruciferous flower is not strictly symmetrical in relation to the floral axis. The arrangement of the calyx and corolla at first appears to follow the quaternary type, four sepals alternating with four petals ; but the slightest examination shows that the two antero-posterior sepals are inserted lower than the two lateral ; the petals, however, evidently form a single whorl. The exceptional structure of the andrcecium has given rise to many contradictory theories. The two lateral stamens are shorter and lower than the other four, which are in pairs, and alternate with the two lateral. It is these two pairs of long stamens which have especially exercised the sagacity of botanists. De Candolle, and after him Seringe, Saint-IIilaire, Moquin-Tandon, and Webb, admit the quaternary type for the calyx and corolla, and extend it equally to the andrcecium, where, according to them, each pair of long stamens represents a 230 XIV. CEUCIFERJE. double stamen. This theory does not account for the lower position of the two antero-posterior stamens relatively to the lateral sepals, nor for the situation of the short stamens opposite to the carpels, which would be contrary to the laws of alternation. Later botanists (Lestiboudois, Kunth, Lindley, and then J. Gay, Schiuiper, "VVydler, Krause, Duchartre, Chatin, Godron) advocate an entirely different theory. They do not admit the doubling of the long stamens; they affirm, contrary to the organogenic observations of Payer, that 'in the very young flower each group of twin stamens springs from two distinct protuberances, separate from each other and exactly opposite to the petals. They consider the nndroecium to be composed of two quaternary whorls : 1st, the lower whorl, represented by the two lateral stamens only, and which is an imperfect one, from the constant arrest of two stamens which should be developed in front of the antero-posterior sepals ; 2ndly, the upper whorl, composed of the four large stamens which were originally developed opposite to the petals, but which approach each other afterwards, so as to form two pairs. As to the pistil they consider it to be normally formed of four carpels opposite to the four sepals, an arrangement which is observable in the genus Tetrapotna. Thus the original plan of the flower may, according to them, be formulated as follows: four sepals, four petals, four outer stamens, of which two are never developed, four inner stamens, and four carpels, of which the two antero-posterior are developed in Tetrapoma only ; all these whorls exactly alternating with each other. More recently, A. G. Eichler has published (in 18Go), in the ' Flora of Brazil,' the result of his researches. He affirms, with Do Candolle, that eacli pair of long stamens results from the splitting up, or c7n>risis, of a single stamen, because, according to his organogenic researches, the protuberance from which each pair of stamens springs is originally simple, and only divides afterwards. With regard to the two-celled anthers of the twin stamens, which, according to the partisans of the non-development theory, ought to be one-celled, Eichler avers that this objection is valueless ; that the question here is not of a doubling, which divides an entire organ in two halves ; but of a chorisis, which results in a sort of multiplication of the organs ; and that, further, in the genus Atclanthera the long stamens are constantly one-celled. With regard to the polyandry observable in some species of Megacarptea, in which the androeciuin is composed of 8-10 stamens, we may, according to Eichler, admit that it results from an unusual multiplication of the long stamens, and that the chorisis has been extended to the lateral stamens. We must, besides, remember that this tendency to multiplication (which is really exceptional, and not found in all the species of Megacarpcea) also appears in Cleometf, a tribe of Capparidetp, a family closely allied to Crucifera ; their andreecium, which is normally hexandrous, and arranged like that of Cruciferee, presents in some species of Clcome four stamens, and in Polqnitia eight or oc, collected in antero- posterior bundles, the two lateral remaining solitary, or very rarely being represented by stamens. According to Eichler's organogenic observations, the anterior sepal appears first, and then the pos- terior, after which the two lateral sepals appear together; the four petals then appear simultaneously, and occupy, four points, diagonally crossing the lateral sepals. The androecium first appears as two large obtuse gibbosities, opposite to the lateral sepals, which remain simple, and become the short stamens. Soon after their appearance the two similar antero-posterior gibbosities appear, inserted higher than the preceding, larger and more obtuse ; and these, enlarging more and more, gradually divide into two protuberances, which finally become two long stamens. Never, says Eichler (who energetically maintains his opinion against that of Duchartre, Chntin, and Krause), never are these stamens, when young, exactly opposite to the petals ; they are, on the contrary, then nearer to the median line, an arrangement which is still more obvious in some hexandrous Capparidea>. He affirms, contrary to the observations of Chatin, that in Crvcifera with fewer than six stamens (Lcpidiutn ruderale, latifolium, rin/inid/nim, &c.) the lateral stamens are inserted lower than the two antero-posterior, -which proves that the latter do not belong to a lower whorl, as the incomplete-development theory demands. Eichler consequently regards the theory of chorisis as true, but his application of it diners from that of De Candolle, in that the latter makes three tetramerous whorls (androecium, corolla, and calyx), while Eichler only admits one, i.e. corolla, and assigns a binary type to the androecium and calyx ; and his view of the composition of the flower would be :— two antero-posterior sepals, two lateral sepals, four petals diagonally crossing the lateral sepals, two short lateral stamens, two antero-posterior stamens (each doubled), and two lateral carpels valvately justaposed. » - The family of Cntcifera is closely allied to Capparidcec, Papavcracea; and Fumariaciw (see these XIV. CRUCIFERS. 231 families). It also approaches Resedacea in habit, aestivation, hypopetalisni, parietal placentation, curved ovule, and exalbiuninous seed. Cruciferce are dispersed over the world ; reaching, in the polar regions and on the highest mountains, the limits of phaenogamic vegetation. Most of the genera and species inhabit the South of Europe and Asia Minor ; they are rarer in the tropics, in extra-tropical and temperate North America. The name Antiscorbutics, given by Crantz to the plants of this family, designates their most important property. They contain, besides oxygen, hydrogen, and carbon, a notable quantity of sulphur and azote. These elementary bodies form by their various combinations mucilage, starch, sugar, a fixed oil, albumine, and especially the elements of a peculiar volatile and very acrid oil, to which Crucifers owe their stimu- lating virtue. When dead, these ternary and quaternary products rapidly decompose to form binary compounds, and especially hydro-sulphuric acid and ammonia, the foetid odour of which is insupportable. The principal edible species is the Cabbage (Srassica. oleracea), which has been cultivated from the most ancient times, and which yields varieties or races known under the names of Colza, Kail, Cabbage, Savoy, Cauliflower, Broccoli, &c. The Rape (B. Rapa) and the Turnip (B. Napus} have a fleshy root, rich in sugar and albumine ; and their seeds con- tain a fixed oil, used for burning. The Radish (Raphanus*), of which two species are cultivated, the one with a root black outside and white within ; the other (Small Radish), with a white, pink, or violet root, is used as a condiment. At the head of the antiscorbutic Crucifers must be placed the CocTilearia officinalis, a biennial herb which inhabits the shores of the seas and salt lakes of the North of Europe ; its congeners of the European Alps, the Mediterranean region, Asia, and North America, possess similar properties, but in a less degree. The Garden Cress (Lepidiwn sativum) andWater Cress (Nasturtium officinal*;) are also used as condiments. Lepidiiim oleraceiim, which grows on the shores of New Zealand, is an excellent antiscorbutic, and also an agreeable vegetable, which has proved invaluable to seamen ; Cardamine hirsuta, amara and pratensis, indigenous species, which rival Water Cress, have an acrid and slightly bitter taste ; C. asarifolia replace* Cochlearia in Piedmont ; C. nasturtioides is eaten in Chili as cress is in France ; C. mariiima, which grows on the shores of the Atlantic and Mediterranean, has fallen into disuse ; but C. americana has in North America and the Antilles a great reputa- tion as an antiscorbutic. Barbarea mdga-* ris (Winter Cress), an indigenous plant, of an acrid and piquant taste, has been unjustly abandoned. Sisymbrium offic'male. another Rose of Jericho . j. . ,, {Anastatica hierochuntieu,) common indigenous species, was formerly used as a cough medicine. S. Attiaria, whose bruised leaves exhale a strong odour of garlic, was long employed as a vermifuge, diuretic and depurative. Sea-kale (Crambe maritima), which grows on the shores of the Atlantic and British Channel, is now 232 XV. CAPPARIDEJE. cultivated; its spring shoots are blauehed, and when cooked have so. ue what the taste of Cauliflower*; C. tatnrica inhabits the sandy plains of Hungary and Moravia ; its large root, commonly called Tartar bread, is eaten, cooked or raw, seasoned with oil, vinegar, and salt. Black Mustard (Sinapix niyra) grows in fields throughout Europe. Its powdered seeds are used as a condiment and rubefacient ; it contains a fixed and very acrid volatile oil, to which Jatter its pungent quality is due. But this volatile oil does not exist thei e ready formed ; it is produced by the action of a peculiar nlbumine (myrotine) on the myrotric acid contained in the seed ; it is this acid which becomes the volatile oil ; and to effect this change the albumine must be soaked in cold water, which, by dissolving it, renders it fit to change the acid into a volatile oil. "White Mustard (S. alba) contains principles analogous to those of the preceding species, the mucilaginous testa of the seed being superadded to an active principle, which stimulates the digestive organs. & chi/ienisix is valued in India as much as S. niyra, Horseradish (Cochlearia rutticana or Armoracia) is cultivated in all gardens of central Europe; its root contains much sugar, starch, fatty oil, and albumine, and is eaten as a condiment. The acrid principle which it contains, and which is developed by the action of water, like that of Hinapis, gives it antiscorbutic properties. The seeds of the Wild lladish (Haphanittrum arvensc), of Eruca satioa, of Mithridate Mustard ( Tftlaspi arvenee), and of Honesty (Lwiariti m//«Y«), indigenous plants, have fi.llen into disuse, in spite of their stimulating acridity. Those of Catnelina satii-a contain a fixed oil, used for burning. The leaves of Woad (Isatis tinctoria), a herb common throughout France, yield a blue dye, similar to indigo, but inferior, with which the Picts and Celts used to paint themselves ; and from these early times blue has remained the national colour for our royal robes. Anastatica hierochwitica is a small annual which grows in sandy places in Arabia, Egypt, and Syria. Its stem branches from the base, and bears sessile flowers, which give place to rounded pods; as these ripen, the leaves fall, the branches harden, dry, and curve inwards, and the plant contracts into a rounded cushion, which the autumn winds soon uproot, and carry even to the sea shore. Thence it is brought to Europe, where it fetches a high price, on account of its hygroruetric properties ; if the tip of its root be placed in water, or even if the plant be exposed to damp, the pods open and the branches uncurl, to close afresh when dry. This peculiarity, together with its native country (whence its name, Rose of Jericho), has given rise to the popular superstition that the flower expands yearly on the day and hour of Christ's birth. Women sometimes place the plant in water at the commencement of labour, hoping that its expansion may be the signal for their deliverance. Many other plants possess a similar hygrometric property ;' as certain (\nnpmitfe of the genus Axteriscti*, llantayn crctica, Nt-fayi'iu-llu rircinalfs, &c. XV. CAPPARIDES. (OAPPARIDES, Jussieu. — CAPPARIDES, Vcntenat. — CAPPARIDACES, Lindl.) OEPALS 4-8, free or coherent. PETALS hypogynout or perigynons, 4—8 or 0. OTAMENS usually 6, or co, hypogynous or periyynous. OVARY usually stipitate and 1-celled, ivith parietal placentas. OVULES curved. FRUIT a siliquosc capsule, or berry. SEEDS exalbuminous. EMBRYO arched or folded, Herbaceous annuals, or rarely perennials, often shrubby, sometimes arborescent (Morisonia, Crata>va,&c.), with watery juice. STEM and branches terete, glabrous, glandular, cottony, or rarely scaly (Atamisquea, Capparis}. LEAVES alternate, or very rarely opposite (Atamisquea), petioled, simple or digitate, leaflets entire, very rarely toothed (Cleome), or lobed (TJiyJadiium) ; «/ ipules usually 0 or inconspicuous, setaceous 1 In England, Meseralrtyanthemum capsules are sold as tin- Kosc of J.-rii-lio; as is (lie Mexican 1 1 piil< tphylla. — ED. XV. CAPPAEIDE.E. 233 Caper. (Capparis spinoxi.) Capparis. Capparis. Stamen (mag.). Embryo coileil (mag.). Cleome. Fruit, entire and stripped of its valves. Cuppani. Diagram. C/eonie. Diagram Capparis, Capparis. Capparis. Cristatella. Flower cut vertically. Fruit cut transversely. Seed, entire ami cut vertically (mag.). Flower cut vertically. or spinescent (Capparis). FLOWERS £ , very rarely dioecious (Apophyllum), regular or sometimes sub-irregular, axillary, fascicled, solitary, or in a terminal raceme or corymb. SEPALS 4-8, sometimes free, 1-2-seriate, eubequal or unequal ; sometimes variously connate in a tubular calyx, sometimes closed and opening irregularly (Cleome, Thylachium, Steriphoma), aestivation imbricate, or rarely valvate. PETALS usually 4, rarely 0 (Thylachium, ttoscia, Niebuhria, &c.), very rarely 2 (Cadaba, Apophyllum) or 8 (Tovaria), sessile or clawed, sestivation. imbricate or twisted, very rarely valvate (Eitchiea), inserted on the edge of the torus. TORUS short or long, symmetrical or unsymmetrical, or discoid, or prolonged behind into an appendage, or depressed, or narrowed into a pedicel, or lining the bottom of the calyx, edge glandular or fringed. STAMENS inserted at the base or top of the torus, usually 6, rarely 4-8 (Polanisia, 234 XV. CAPPARIDE.E. Cadaba), often in multiples of 6 or 8, all fertile, or some sterile (Dactylcena, Cleome, Polanisia, &c.) ; filaments filiform, sometimes thickened at the top (Cleome), free or united to the torus, or connate at the base (Gynandropsis, Cadaba, Boscia, &c.) ; anthers introrse, 2- celled, oblong or ovoid, basi-dorsally fixed, dehiscence longi- tudinal. OVARY usually stipitate, rarely sessile, 1-celled, or sometimes 2-8-celled by false septa springing from the placentas (Morisonia, Capparis, Tovaria, &c.) ; style usually short or 0, simple (3, a,nd hooked in Roydsia} ; stigma usually orbicular, sessile ; ovules numerous, fixed to parietal placentas, campylotropous or semi-anatro- pous, rarely solitary (Apopkylluwi). FRUIT a capsule, siliquose and 2-valved, or a berry, very rarely a drupe (Roydsia). SEEDS reniforin or angular, often sunk in the pulp of the fleshy fruits, exalhuminous, or very rarely albuminous (Tovaria) ; testa smooth, coriaceous or crustaceous. EMBRYO curved or arched ; cotyledons incumbent or accumbent, folded, coiled or induplicate, rarely flat. TRIBE I, CLEOME&. Fruit a 1-celled capsule, usually siliquose. Mostly annual herbs. PRINCIPAL GENERA. * Cleome. Isomeris. . Tolftnisia. *Gynandropsis. TBIBE H. CAPPAREM Fruit a berry or drupe. Shrubs or trees. PRINCIPAL GENERA. * Morisonia. Mierua. Boscia. lloydsia. Ritchiea. Niebuhria. Cadaba. *Capparis. Tovaria.1 Capparidefp approach Crucifera; in the number of sepals, petals and .stamens, the {estivation, the ovary with parietal placentation, with or without a false septum, the campylotropous ovulea, eiliquose fruit, exalbuminous seed, curved embryo, and acrid volatile principles. They scarcely differ, except in the sometimes perigynous insertion, the never tetradynamous stamens, the usually stipitate ovary, and the often fleshy fruit. They are equally closely allied to Moringca; (which see). They also resemble Tropatoleee in their habit, exalbuminous seed, and acrid principle. Iteseduceee are separated only by their habit and the structure of their fruit. Capparidere are distributed nearly equally over the tropical and subtropical regions of both hemispheres ; the frutescent species are mostly American.3 The herbaceous cnpsular Capparidea rival Cruciferat in their stimulating properties, which depend on an acrid volatile principle. The species with fleshy fruit, which are mostly woody, possess this acridity in their roots, leaves and herbaceous parts ; their bark is bitter, and some have a pleasant fruit. Cleome yigantea is used as a rubefacient in tropical America. The herbage of Gyiumdroptu pentaphylla, a native of the tropics in both worlds, has the qualities of Cochfearia and Lepidiwn, and its oily seed is as acrid as that of Sinapis. Polanisia fcllina and icosandra, natives of India, are epispastics and vermifuges; the fresh juice is used as a condiment. Clcome heptaphylla and polygatna, American plants, have a balsamic odour, whence they have been reputed vulneraries and stomachics. Polanisia grareokns, a native of North America, and a very foetid plant, possesses the same qualities as Chcmipodiinn anthclminthicum. Among the Capparidea with fleshy fruit, Cappurin spinosa must rank first. It is a shrub of the Mediterranean region, the bitter, acrid and astringent bark of whose root has been esteemed from 1 1n- most ancient times for its aperient and diuretic qualities. The flower-buds, preserved in salt and vi 1 Tovaria has been transferred to PajMtwrdrete by Eichlcr.— En. - As many are natives of the old world as of the new. — EIJ. XVI. MORINGE^L 235 are known as Capers, and much used as a condiment. Other species of Cappwis from Greece, Barbary and Egypt, are similarly used. Capparis sodada is a native of tropical Africa; the negresses eat its acidulous and stimulating fruit, which they believe will make them prolific. The bitter and astringent bark of Crateeva Tapia and (/ynandraf American trees, is reputed a febrifuge. Their fruit, which has an oily odour, is eatable. C. Nurvala, of tropical Asia, produces succulent and vinous berries; HS- acidulous leaves are diuretic. XVI. Endlicher. Moringa, Par); of fruit cut vertically Moringa. Seed, entire and cut vertically (mag.). Moringa. Moi-inga. Embryo cut vertically (mag.). Anther (mag.). Moringa. Flo\ver cut, vertically (mag.). Aforinga. Flower-bad (mag.). XVII. RESEDACE^E. TREES. LEAVES 2-3-imparipiimate ; leaflets very caducous ; stipules deciduous. FLOWERS $ , irregular, in pauicled racemes. CALYX 5-partite, with oblong subequal segments, imbricate in bud. PETALS 5, inserted on the calyx, linear-oblong, the two posterior rather the longest, ascending, imbricate in bud. STAMENS 8-1.0, inserted on a cup- shaped disk lining the base of the calyx ; filaments flattened at the base, connivent in a tube which is split behind, united above the middle, free above and below, unequal, the posterior longest, all fertile, or those opposite the calyx- segments shorter and imperfect; anthers introrse, 1 -celled, ovoid-oblong, dorsally fixed, dehiscence longitudinal. OVARY pedicelled, 1 -celled, with three parietal slender placentas ; style terminal, simple, thickened [tubular, open at the truncate top] ; ovules numerous [bi-seriate] , pendulous, anatropous, [raphe ventral]. CAPSULE siliquiforin, :}-many-angled, torulose, 3-valved, valves with the placentas on the middle. SEEDS 1-seriate, separated by spongy septa, ovoid-trigonous, angles apte- rous or winged ; chnlaza apical, corky. EMBRYO straight, exalbuminous ; cotyledons pliuio-convex, fleshy [plumule many-leaved] ; radicle very short, superior. ONLY GENUS. Moringa. Tlve genus Miirtiit/ii lias been by sonic botanists placed in Pajrilionacea on account of a slight resem- blance iu the flower, which, however, indicates uo true affinity. Hooker [following Lindley] compared it with riolan't'ff, which resemble it in their irregular flower with unequal dorsal petal, in their perigynous insertion, tubular style, one-celled ovary with three parietal nerviform placentas and auatropotu ovules ; but Murinyetf are widely separated by habit, one-celled anthers, and exalbuminous seeds. It is amongst Capparidcee that we must search for the real allinities of Morinyete, through their polypetalous imbricate corolla, perigynism, stamens more numerous than petals, stipitate one-celled ovary, parietal placentation, siliquose capsule, exalbuminous embryo, altenmte leaves and caducous stipules; to which must be added the acrid root, leaves, and bark, which are common tolxrth families, recalling the smell and taste of the Horse-radish, and a.s.-uciating Mvrinya also with ( 'i-ncifcrer, themselves so closely allied to Capparideee. MoriHi/efc are tropical Asiatic, Arabian and Madagaeoui trees. The best known species is "Moringa ftjrtcm, of which the seed, called Ben nut, yields a fixed oil, of much repute in the East, because it does not become rancid [and used by perfumers and machinists from its not freezing. The root of M. pteryyosperma is used as a stimulant in paralysis and intermittent fevers; and a colloid gum, like tragacanth, exudes in great quantities from its bark. — Ep.l. XML RESEDACE^E, D.C. CALYX 4-8-partite. PETALS generally hypogynous, 4-8 (rarely 2 or 0). STAMENS 3-40, inserted within a fleshy dink. CARPELS usually united into a 1- celled ovary. FRUIT a capsule or berry, SEEDS exalbuminous. EMBRYO curved. Annual or perennial HERBS, sometimes UNDERSHRUBS, rarely SHRUBS (Ochradenus), juice watery, stem and branches terete. LEAVES scattered, simple, entire, 3-fid or pinnatipartite ; stipules minute, gland-like. FLOWERS ? , rarely diclinous, more or less irregular, in a raceme or spike, bracteate. CALYX persistent, 4-8-partite, more or less unequal, aestivation imbricate. PETALS alternate with the calycinal lobes, 4-8, rarely 2 (Oligomeris) , or 0 (Ochradenus) , hypogynous, or rarely perigynous (Randonia), entire, or 3- oo-fid, simple, or furnished with a basal scale, free, or rarely XVII. RESEDACE.E. 237 Mignonette. (Reseda odorala.) Reseda. Flower seen in front (niag.). Reseda. Flower seen at the back (mag.). Reseda. Flower cut vertically (mag.). Ochradenm. Fleshy fruit (mag.). Reseda. Flower without the petals (mag.). Randonia africana. Diagram. Reseda. Reseda. Reseda. Reseda. Reseda. Diagram. Calyx, disk, ami young pistil (mag.). Young fruit (mag.). Kipe fruit. Fruit laid open (mag.). Reseda. Stamen, inner face (mag.). Reseda. Seed, entire and cut vertically (mag.). Reseda. One of the posterior petals (mag.). Reseda. One of the lateral •petals (mag.). Reseda. One of the anterior petals (mag.). Reseda. Transverse section of ovary (mag.). sub-coherent (Oligomeris) , equal or unequal, open in aestivation. DISK hypogynous, sessile or stipitate, more or less concave, fleshy, often prolonged behind, rarely 0 (Oligomeris). STAMENS 3-40, inserted within the disk, rarely perigynous (Randonia), not covered by the petals in aestivation ; filaments equal or unequal, often pendulous, free or rarely connate at the base (Oligomeris) ; anthers introrse, 2-celled, dehiscence longitudinal. OVARY sessile or stipitate, of 2-6 carpels, sometimes coherent into a 238 XVIII. CISTINE^. 1 -celled ovary, closed or gaping at the top, with many-ovuled parietal placentas, more rarely distinct, or sub-coherent at the base, many-ovuled and with basilar placentation, gaping (Caylusea}, or 1-2-ovuled and closed (Astrocarpus) ; stigmas sessile, terminating the 2-lobed top of the carpels ; ovules campy lotropous or half- anatropous. FEU IT usually a capsule, indehiscent, closed or gaping at the top, rarely a berry (Othradenus) , sometimes follicular (Astrocarpus}. SEEDS reniform, exalbuminous, epidermis membranous, adhering to the testa, or detaching when ripe ; testa crugtaceous. EMBRYO curved or folded ; cotyledons incumbent ; radicle near the hilum. GENERA. Astrocarpue. Itandonia. Caylusea. *J5eseda. Ochradenus. OHgomeris. The small family of Rescdacca; is allied to Cnicifera> and Capparidftc (see these families). It also approaches Mwinyetc in its irregular polypetalous flowers, fleshy disk, stamens more numerous than the petals, parietal plaeentation, capsular fruit, exalbuminous embryo, alternate stipulate leaves, and finally in the acrid principle found in the root of several species ; but Morinyea are separated by their habit, arborescent stem, two- three-pinnate leaves, straight embryo, filaments united into a tube above the middle, and one-celled anthers. Most Rcsedacecc grow in southern Europe, northern Africa, Syria, Asia Minor and Persia. Some roach the Indian frontier: a few inhabit central and northern Europe. Three species belong to the Cape of Good Hope. Jtesedttcete, so named because sedative qualities were formerly attributed to them, are HO longer used in medicine, in spite of the acridity of their root, which contributes, with other characters, to bring them near Cruciferee and Cappandeee ; the root of Renedu lufea in particular has the odour of the Radish, and was long reckoned an aperient, sudorific and diuretic. Dyer's Weed (R. lutcola) has intensely bitter leaves, and sill parts yield a yellow dye much in demand. Mignonette (7?. odorata), a plant whose origin was long considered unknown, but which Griffith asserts to be a native of Afghanistan, is extensively cultivated fur its sweet scent. XVIII. CISTINEjE. (CiSTi, Jussieu. — CISTOIDE.*, Ventenat. — CISTINE^J, D.C. — CISTACE^E, LindL) PETALS 5-3, hypogynous. STAMENS oo, hypogynous. OVAKY I-celled, with 3-5 parietal placentas. OVULES orthotropous. STYLE simple. CAPSULE with the placentas on the centre of the valves. SEEDS albuminous. EMBRYO bent, coiled or folded. HERBS, UNDERSHRUBS, or SHRUBS ; stem and branches terete or sub-tetragonous, often glandular, pubescent or tomentose, with simple or sometimes stellate hairs. LEAVES simple, opposite, rarely alternate, sometimes whorled, entire, sessile or petioled ; stipules foliaceous, free at the contracted base of the petiole, or 0 when the petiole is amplexicaul. FLOWERS $ , regular, terminal, solitary, or in cymes or unilateral racemes, peduncle outside of the axil of the bracts. SEPALS 3, twisted in bud, often furnished with 2 usually smaller calyciform bracts. PETALS hypogynous, 5, very rarely 3, or 0 (Lechea), twisted in aestivation in an opposite direction to the sepals, scarcely clawed, spreading, very fugacious. STAMENS ex, hypogynous ; fila- ments free, filiform ; anthers 2-celled, introrse, ovoid or lanceolate, dehiscence longitudinal. OVARY free, sessile, 1 -celled, or with 3-5 imperfect cells formed by XVIII. CISTINE.E. 239 Helianthemum. Flower. TlelianthemuiH. Flower without its corolla (inag.). Helianthemum. Vertical section of flower (mag.). Helianthemum ytittatum. Cist us Ladanum. Seed, entire and cut Helianthemum. vertically (mag.). Pistil (mag.). Ifetianthemum. Diagram. Helianthemmm. Stamen (mag.). placentiferous septa only united at the bottom of the ovary ; placentas 3-5, parietal, or fixed to the half-septa, 2- oo-ovuled ; style simple ; stigmas 3-5, free, or united in a head ; ovules with short or longer funicles, usually ascending, orthotropous, or half- anatropous. CAPSULE membranous or coriaceous, opening to the base, or above only, into 3-5 half-placentiferous valves. SEEDS with crustaceous testa, and floury or sub-horny albumen. EMBRYO excentric or sub-central, bent, coiled, or folded, rarely nearly straight (Leched) ; liilum and chalaza contiguous, diametrically opposite to the radicle, except in some species (Lechea), in which the funicle is adnate to the seed. * Cistus. GENERA. 'Helianthemum. Hudsonia. Leehea. Cistinefe are near Droseracea;, Violnrica; and liixinescraccf Aiwhit'tfii miliiturig, a small Brazilian tree, is purgative, and useful, like our wild Pansy, in skin aflections. lonidium inicnijihi/lluin, a species XXI. BIXINE^. 243 growing at the foot of Chiiuborazo, is supposed to yield the root called Cuichunchulli, prescribed by the Americans for tubercular elephantiasis. The medical properties of Al$odinca> are very obscure, and entirely differ from those of Violets. The leaves and bark of Ahodeia Ciixpu, which grows in New Granada, are bitter a:id astringent. The leaves of A. castanea'folia and Lobolobo, Brazilian species, are mucilaginous, and are cooked and eaten by the negros. XX. CANELLACE^} \. Glabrous aromatic trees. LEAVES alternate, quite entire, penninerved, pellucid- dotted ; stipules 0. FLOWERS g , regular, in terminal, lateral, or axillary cymes ; Iracteoles (sepals of some authors) 3, orbicular, close under the calyx, much imbricate, persistent ; sepals (petals of some) 4-5, free, thick, deciduous, much imbricate, the inner narrowest. PETALS (petaloid scales of some) as many as the sepals, thin, imbricate or 0. STAMENS hypogynous ; filaments connate into a tube ; anthers 20 or fewer, linear, adnate to the outer surface of the tube, longitudinally 2-valved. DISK 0. OVARY free, 1 -celled; placentas 2-5, parietal, 2- or more-ovuled ; style short, thick; stigmas 2-5; ovules horizontal or ascending, almost anatropous. BERRY indehiscent, 2-many-seeded. SEEDS with a shining crustaceous testa ; albumen oily and fleshy. EMBRYO straight or curved ? , radicle next the hilum ; cotyledons oblong. GENERA. Canella. Cinnamodendron. Cinnamosma. A very small order, placed by Martins near Guttifcrtt, included by Lindley under Pittosporeee, and placed by Miers near Magnoliacea ; but according to Bentham and Hooker fil. it has less affinity with any of the above orders than with Vu>larietea,n isostemonous, cestivation imbricate. STAMENS 5, alternate with the petals. OVARY of 5 more or less perfect many-ovuled cells. OVULES anatropous. FRUIT dry or fleshy. EMBRYO alluminous. STEM woody. LEAVES alternate. TREES or erect SHRUBS, sometimes climbing (Solly a). LEAVES alternate, petioled, simple, sub-coriaceous, exstipulate. FLOWERS 5 , regular, axillary or terminal, racemose, corymbose, or cymose. CALYX 5-partite or -phyllous, aestivation 248 XXII. PITTOSPOREJE. fiUottporiim phillyra>(iides. /Wnxporum Fruit cut vertically phitliircfoide*. (mag.). Pistil (mag.). f'ttlttfporiim tineatt. Ptttotpomm. Diagram. I'ittosporinn i>ltilliirnandrep\]<> inferior, funiclr I-MIL:, XXV. FEANKENIACE^E. 253 Frankenia. Flower cut vertically (mag.). Frankenia. Seed, entire and cut transversely (mag.). Frankenia. Transverse section of ovary (mag.). Frankenia. Andrcecium and pistil (mag.). Frankenia. Frankenia. Valve of fruit (ruag.). Dehiscent capsule (mag.). ascending. CAPSULE included in the calyx-tube, valves 3-4, placentiferous in their lower half. SEEDS ascending, ovoid; testa crustaceous; raphe linear; chalaza apical. EMBRYO straight, in the .axis of a floury albumen ; cotyledons ovoid-oblong ; radicle very short, inferior. ONLY GENUS. Frankenia. This small family is closely allied to the tribe Silcneec of Caryophyllece, tut is distinguished by the ex- trorse anthers, parietal placentation, seed with sub-terminal hilum, and straight embryo. It also approaches Tamarisdnece in hypopetalism, one-celled ovary, parietal placentation, ascending anatropous ovules, capsule- valves seminiferous towards the base, and straight embryo j but Tamariscineee differ in their nearly free imbricate sepals, introrse anthers, exalbjyminous seed, alternate leaves, and spiked inflorescence. Frankeniacece inhabit extra-tropical maritime shores, and principally the Mediterranean and Atlantic, 254 XXVI. CARYOPHYLLE^. extending into central Asia and north-western India ; they are very rare in the tropics and southern latitudes. Frankenia are mucilaginous and slightly aromatic. F. portttlacifolia, which grows on maritime rocks in St. Helena, was formerly used by the colonists as tea. XXVI. CARYOPHYLLE^E, Jiissieu. SEPALS free or united. PETALS 4-5, hypogynous or sub-perigynmts, sometimes (). STAMENS usually twice as many as the petals, and inserted with them. OVARY l-cdled, or with 2-5 imperfect cells. OVULES vent rally attached, placentation central or basilar. SEEDS smooth or granular, albumen usually floury. EMBRYO wore or less curved. — LEAVES opposite. Annual or perennial HERBS, rarely shrubby. STEM and branches often thickened at the nodes, and sometimes jointed. LEAVES opposite, entire, usually 1-3-nerved, sometimes without nerves, often united at the base, exstipulate, or furnished with small scarious stipules. FLOWERS regular, ? , or rarely unisexual. INFLORESCENCE centrifugal, sometimes many-flowered, in a simple or dichotomous loose or dense cyme, rarely in a thyrsoid or panicled raceme ; sometimes few-flowered, simply forked, or reduced to a single flower ; bracts opposite, at the forks, upper often scarious. SEPALS 4 5, persistent, free or united into a 4-5-toothed ealyx, aestivation imbricate. PETALS inserted on a hypogynous or sub-perigynous disk, entire, 2-fid or laciniate, claw naked or appendiculate within, aestivation imbricate or twisted ; sometimes minute, scale-like, or 0. STAMENS 8-10, inserted with the petals, sometimes equalling and alternate with them, very rarely alternate with the sepals (Colobanthus), sometimes fewer than the petals; filaments filiform ; anthers introrse, dorsally fixed, cells opening longitudinally. TORUS usually small, sometimes (in some Silenea') elongated into a gynophore, and bearing the staiwena on its summit beneath the ovary; sometimes (in many Alsi nea;) forming a staminiferous annular disk, slightly adnate to the base of the calyx, or swelling into short glands between the stamens, or bearing, outside the stamens, staminodes opposite to the sepals. OVARY of 5 or 4 united carpels, or of 3 of which 2 are anterior, or of 2 which are antero-posfcerior, free, 1 -celled, or rarely 2-5-celled owing to more or less perfect membranous septa which disappear early ; stales 2-5, stigmatiferous along their inner edge or at their top, free or united into a single lobed or toothed style (Poly carped) • ovules 2-oo , very rarely solitary (Queria), fixed by the middle of the inner edge and face to funicles springing from the bottom of the ovary, distinct or cohering into a central column, ascending, micropyle inferior or transverse. CAPSULE membranous or crustaceous, rarely berried (Cucubalus), bursting loculicidally or septicidally by valves or apical teeth ; valves sometimes as many as the sepals, and when 5 opposite either to the sepals (Lychnis, Viscaria, Petrocoptis] or to the petals (Agrostemma), sometimes double in number, rarely sub-indehiscent (Drypis, Oucubalus, Ac.). SEEDS GO , or solitary by arrest, smooth and shining, tubercular or muricate, rarely winged on their circumference ; sometimes reniform, globose, obovoid or com- pressed, hilum marginal; sometimes depressed, scutiform, hilum facial; albumen floury or rarely sub-fleshy, placed in the bend of the embryo or on its sides, some- XXV I. CARYOPHYLLE^E. 255 times forming a thin, layer on its^ dorsal surface, rarely 0 (Velezia, sp., Diunthns). EMBRYO more or less curved, peripheric or annular (Dry pis), or nearly straight in the scutiform seeds ; cotyledons narrow, plano-convex or half-cylindric, incumbent or very rarely accumbent ; radicle cylindric, inferior or superior. TRIBE I. SILENEJfi, D.C. Sepals united into a 5-toothed or -lobed calyx. Petals and stamens hypogynous, inserted on an erect gynophore, rarely sessile. Petals with scales at the top of the claw, or naked. Styles completely distinct.— Leaves exstipulate. 1. Lychnideae. — Corolla, twkted or imbricate in aestivation. Calyx with eommissural nerves. Petals usually furnished at the base of the limb with scales forming a coronet, very rarely with small winged bands at the claw (Agrostemma). Fruit 3— 5-merous. Embryo ai'ched, circular or coiled (JDrypis). PRINCIPAL GENERA, Petrocoplis. * AgTosleinma. * Lychnis. * Viscavia. Melandrmm. * Silene. Cucubalus. * Drypis, Melandrivm diuicnm. 9 flower. Mflandrium iliuicum £ , Flower cut vertically (mag.). Melandrium dioicum £ . Androecinm surroundinfl an abortive pistil. Melandi ium dioicum 9 Transvei-se eection of ovary (mag.). Drypis s/iinosa. Seed, entire and cut vertically, with coili:d and incumbent uotyludons (mag.). Cuciilatlus baccifer. Seed, entire, and with vertical and transverse sections showing the incumbent cotyledons (mag.). 256 XXVI. CAEYOPHYLLEJE. Agrottemma. Diagram. Agroflfinma llilhago. Sood, entire, and with vertical and transverse sections, showing the incumbent cotyledons (iiing.). Melandrium dioicutu 9 Vertical section of pistil (mag.). MelitHilriitm Jioieum. Seed (mag.). tfelundrium tlioicum IMstil. .\fiiiniili-iniii dioicum. Fruit. Vitcaria. Diagram. 2. Dianthese. — Corolla always twisted to the right in bud. Calyx with no commissural nerves. Petals usually furnished with small winged bands at the claw, or with a coronet of scales at the base of the limb (Saponaria, Veleziai). Fruit 2-merous. Embryo peripheric, or rarely straight, and then albumen scanty or 0. Saponaria. • (ivpsophiln. * Dinntkus. Velejja. liiunthut. Dehiscent capsule. JJiauthim Cunjdphylltu. Dhiulhut. Seed dorsal face (mag.). bianthui. Seed cut vertically (mag. XXVI. CAKYOPHYLLE^E. 257 Dianthus. Velezia. 'Velezia. Androecium spread out. Seed, ventral face (mag.). Embryo (mag.-). Dianlhus. Pistil (mag.). DiantJms. Petal (mag.). Oianthus. Transverse section of the ovary, at the top, middle, and base (mag.). Velezia. Transverse section of seed (mag.). Saponaria officinalis, Seed, entire, and with vertical and transverse sections (mag.). Gypsophila repens. Seed, entire, and with vertical and transverse sections (mag.) TRIBE II. ALSINEJE, D.C. Sepals free, or united at their base by tlie dislr< Petals and stamens hypogynous on a slightly developed disk, or shortly perigynous. Petals with a short or obtuse base, without claw or scales. Styles quite distinct. Leaves exstipulate, or sometimes with small scarious stipules. Stellaria Ualostea. .MtUaria. Flower cut vertically (mag.). Stcllaria. Diagram. 258 XXVI. CAKYOPHYLLE,E. Siellaria. Pistil and andreecinm (mag.). Stellaria. Compressed seed, entire, and with vertical mid transverse sections, •with incumbent cotyledons (mag.). Steltaria. Dehiscent fruit. Colobanthus. Apetalous flower, stamens alternate with the sepals (mag.). nujTiitiia matroiperma. Seed, entire, and with vertical and transverse sections sliowing the accumbcnt cotyledons (mag.). Sperguhtria marg'mata. Winged seed, entire, and with vertical and transverse sections, with incumbent cotyledons (mag.). Jlolostevm. Depressed seed, vcntnil keeled face (mug.). Holostetun. Sagina. llolotteiiin unilirllatitin. bccd, cut vertically and transversely, with incumbent cotyledons (mag.). PRINCIPAL GENERA. •Cerastiuin. Stellaria. Colobanthus. Qneria. Ctrtutium arrense. Heed, entire, nnd with vertical and transverse sections, with Incumbent cotyledons (mug.). 'Arenaria. *Spergula. Buffbnia. Spergularia. TRIBE III. POLYCARPEM, D.C. Sepals free, or united at the base by the disk. Petals as in Alsinece, usually small, hypogynous, inserted with the stamens on a slightly developed torus, or shortly perigynous. Style simple at the base, 3-2-fid above. Stamens 5 or fewer. Leaves usually furnished with scarious stipules. PRINCIPAL GENERA. Drymaria. Polycarpon. Ortegia. Lceflingia. Polycarpeea. Stipulicida. Caryophylfece, with Paronychieee, Portttlacea, Amarantacec?, liasellcce, Chenopodiete, P/iytolacccte, Nyclagi)iete, and even Polygonece, form a group of plants of which the common character ia a curved embryo surrounding a floury albumen (see these families). Those Carynphyllea which have petals, definite stamens, a one-celled and many-ovuled ovary, and opposite leaves, are easily distinguished from all these families" ; but the apetalous and few-ovuled generu approach several of them. Notwithstanding their parietal placentation, we may unite to this group Mesembryanthemece, which have a curved embryo surrounding a floury albumen, and Cacteat, which have a curved but usually exalbuminous embryo. XXVII. POETULACE^E. 259 Caryophyllece mostly inhabit the extra-tropical regions of the northern hemisphere, extending to the Arctic regions and to the tops of the highest Alps. They are rarer in the southern hemisphere, and still more so in the tropics, where they are almost confined to the mountains. Some Caryophylledi possess refreshing and slightly demulcent properties, but they have fallen into disuse. Such are Holosteum umbellatum, Cerastium arvense, Stellaria Ilolostea and media ; the latter, which grows everywhere, is the common Chickweed whose seeds form the food for many cage-birds. The seeds of Spergula were formerly recommended for consumption. The root of Saponaria officinalis, an indigenous species, contains a gum, a resin, and a peculiar matter which froths in water like soap, whence it has been placed among demulcent and depurative medicines ; some doctors even substitute it for Sarsaparilla in cases of syphilis. The White Lychnis (Melandrium dioicum) and Lychnis chalcedonica are also used as demulcents. Silene Otites, a bitter and astringent herb, is prescribed for hydrophobia. The root of Silene virgimca is used as an anthelminthic in North America. Pinks, and especially Dian- tJms Caryophyllus, have sweet-scented petals, with which. chemists prepare a syrup and a distilled water. The Rose Campion (Lychnis Gitliago) is common amongst corn : its aeeds are acrid, and render bread poisonous when mixed with the flour in too great quantities. XXVII. PORTULACE^, Jussieu. Portulaca. Flower (mag.). Portulaca oleracea. Portulaca. Style and stigmas (mag.). Portulaca. Stamens (mag.). Portulaca. Flower cut vertically (mng.). Portulaca. Fruit, entire ami dehiscent. Portulaca, Seed, entire and cut vertically (mag.). Portulaca. Flower-bud (mag.). s 2 200 XXVII. PORTULACE^]. FLOWERS $ . COROLLA 0, or petals sometimes coherent at the base, very fugacious. STAMENS hypogynous or perigynous, equal and alternate with the calyx-lobes, or double, triple, or multiple in number. OVARY usually free, rarely inferior, 1-S-celled. FRUIT indehiscent, or a pyxidium, or a loculicidal capsule. EMBRYO peripheric, arched or annular, surrounding a floury albumen. Herbaceous annuals or perennials, often suffruticose or fruticose; stem and branches diffuse, glabrous or with simple rarely stellate or hooked hairs. LEAVES alternate or opposite, very various in form, entire, sessile or sub-sessile, often fleshy, with a single nerve, or nerveless, sometimes stipulate. FLOWERS $ , usually regular and axillary, solitary or variously disposed, aestivation imbricate. CALYX diphyllous, or monosepalous with 2, 3, 4, 5 divisions. PETALS 5, 4, 3, hypogynous, or rarely sub-epigynous (Portulaca), distinct, or connate at the base, very tender and fugacious, often 0. STAMENS l-oo , inserted on the receptacle or on the calyx, free or in bundles ; filaments filiform or subulate ; anthers introrse, dehiscence> longitudinal. DISK hypogynous, girding the base of the ovary, very often inconspicuous. OVARY sessile, usually free, sometimes half-inferior (Portulaca), 1— 5-celled, cells 1-few-mariy- ovuled ; style terminal, with 2-8 branches, stigmatiferous on their inner surface ; ovules semi-anatropous, rarely solitary in the 1-celled ovaries (Portulacaria), usually numerous, inserted by separate funicles on a central free placenta, or pendulous to funicles ascending from the bottom of the cell ; in the many-celled ovaries 1 or few or many in each cell, attached to the central angle throughout its length, or to its centre or top. FRUIT a dehiscent capsule, or rarely indehiscent (Portulacaria). SEEDS reniform, ovoid, globose or lenticular : albumen floury. EMBRYO peripheric, curved or annular, surrounding the albumen ; cotyledons incumbent ; radicle facing the hilum. TRIBE L CALANDRINIE2E. Calyx diphyllous, or 2 -partite or 2-3-fid. Petals 5, 4, 3, hypogynous, distinct, sometimes more or less connate into a tube (Montia). Stamens fewer or more than the sepals, or indefinite, hypogynous, inserted alone or in bundles at the base of the petals ; filaments free, or united at the base. Ovary 1-celled, few-several-many- ovuled, placentation basilar or free, central ; style filiform, 2-5-fid. Capsule 2-5- valved. — Herbaceous or frutescent plants. Leaves alternate or opposite, often fleshy, sometimes furnished with intrafoliar stipules cut into hairs or lacinise. Flowers solitary, or collected into racemes, or into axillary or terminal cymes. PRINCIPAL GENERA. Portulacaria. Anncampseros. Talinum. "Calandrinia. "Claytonia. Montia. TRIBE II. SESUVIEJE. Calyx 5-fid, rarely 2-fid or -partite. Petals 0, or rarely 4-6, and epigynous (Portulaca). Stamens 5-10-co, inserted singly or in pairs, or in bundles, at the base or throat of the calyx, and between its segments. Ovary free, rarely inferior XXVII. POKTULACE.E. 261 «. (Portulaca), 1-5-celled, many-ovuled ; ovules ascending, fixed to a basilar placenta, or pendulous to the central angle of the cells ; stigmas 2-5. Capsule opening trans- versely by circular dehiscence.— Fleshy glabrous herbs with opposite or alternate leaves, often stipulate, or bearing stipuliform hairs in the leaf-axils. Flowers axil- lary, sessile, solitary, or glomerate, in spiked or umbelled cymes. PEINCIPAL GENERA. * Portulaca. Sesuvium.1 Trianthema. TitiBE III. AIZOIDE^J. Calyx 4-5-fid or -partite. Corolla 0. Stamens 5-15, inserted singly or in pairs, or in bundles, on the calyx, between its segments. Ovary free, with 2-5 l-2-oo -ovuled cells ; ovules pendulous to the central angle of the cells ; stigmas 5-2. Capsule loculicidal. — Herbaceous or frutescent plants, covered with simple or bi-acuminate hairs. Leaves alternate or opposite. Flowers axillary, sessile. PRINCIPAL GENERA. Aizoon. Galenia. Plintluis. ALLIED TRIBE. MOLLUGINE^. Calyx 5-4-partite, or 5-fid, persistent. Petals 0, or very numerous, ligulate, sub-perigyuous. Stamens hypogynous or perigynous, equal and alternate with the sepals, or fewer, or more, or indefinite, distinct, or aggregated in bundles, the outer alternate with the calyx-segments. Ovary free, many-ovuled, 2-3-5-celled ; ovules fixed to the inner angle of the cells by separate funicles, or rarely solitary and basilar (Acrosanthes) . Capsule usually angular or compressed, loculicidal. Seeds as in Portulacece. — Herbaceous or sub-woody plants, glabrous, or covered Avith stellate hairs. Leaves opposite or alternate, or fascicled and pseudo-whorled, often stipulate. Flowers crowded in racemes or cymes, or in axillary or leaf-opposed umbellules, rarely solitary (Acrosanthes). PRINCIPAL GENERA. Orygia. Gleinus. Mollugo. Pharnaceum. Acrosanthes. Psamnotrophe. Adenogramme. Giesekia. Lirneum. Portulacece approach Tetragoniece, Mesembryanthemece, and Paronychiecs (see these families). The tribe of Molluginece is also connected with Portulacea by habit, the entire fleshy leaves, inflorescence, perigynous corolla, often 0, the isostemonous or indefinite stamens, distinct or aggregated into bundles alternate with the sepals, and especially by the structure of the ovule and the nature of the albumen. 1 In Bentham and Hooker's ' Genera Plantarum,' celled ovary, is placed with the other Aizoidea under Portulaca, from its disepalous calyx and 1-celled ovary, Ficoidete, and referred to the Calycifloral sub-order of is regarded as a very close ally of Montia and the other Dicotyledons. No doubt the Ficoidea and Portulacea disepalous Portulaccff, included in this work under the are members of one great group (which should also tribe Calandrinicce ; whilst Stsuvium (and Trianthema} include Tetraffonic horizontal in each cell, anatropous. CAPSULE loculicidally 3- valved, or by arrest 1 -celled and 1 -seeded. SEEDS pendulous or sub-horizontal ; testa coriaceous; albumen fleshy or horny. EMBRYO straight; cotyledons leafy, flat or plaited ; radicle superior. GENERA. Sarcolaena, Leptolaena. Schizoleena. Rhodolaena. A small and little known Madagnscan order, allied to Tiliacea;, but with imbricate sepals ; also allied to Temsf.rcemtaccr incised, often pubescent, not clawed, valvate, rarely imbricate or contorted. TRIBE V. PROCKIE;E. — Anthers digynoua, subglobose, cells dehiscing longitudinally. Frock ia, llasscltia. TRIBE VI. SLOANE.E. — Anthers linear, cells dehiscing at the top. Torus flat or turgid ; sepals and petals inserted close to the stamens. Vallea, Sloanea, Ecliinocarpw, Antholoma. TRIBE VII. ELEOCARPE.E. — Anthers linear, cells dehiscing at the top. Petals inserted around the base of a glandular torus with stamens at its top. Anstotclia, Elceocarpus, Dubou- zdia, &c. — ED.] Tiliacea and Ela-ocarpcfr, which formerly formed two families, have been united by Endlicher and Kentham and Hooker fil. ; the latter have joined Prockia to them, which was formerly placed in Buinea, but from which they differ in their axiie placentation. Tiliace

of Storculinccte by their valvate calyx, their petals which are hypogynous or 0, numerous stamens, fleshy albumen, woody stem, alternate stipulate leaves, and stellate pubescence ; besides which, in Elceocarpca; the iiuluplicate base of each petal embraces a group of stamens as in liuttiieriea, though in Elceocarjwee there is further one isolated stamen left opposite each sepal. They are similarly related to Malvacea-, which also differ in their one-celled anthers. They also approach Camelliacete in polypetalism, hypopyny, polyandry, the connate filaments, apical dehiscence of the anthers (observable in the genera Sauranja and Penta- phyla.r), the several-celled ovary, &c. ; but the valvate icstivation of the calyx separates them. Finally, they have more than one point of analogy with Chl&nacctE ; but these are distinguished by their imbricate calyx, and especially by the urceolate filaments. Most TiUacca; are tropical ; a few inhabit the temperate northern hemisphere, and some are found beyond the tropic of Capricorn. Sroicnloma and the allied genera are tropical Asiatic and African ; Grmcia and Cot-chorus are natives of the hot parts of the Old World ; Sparmannia, of tropical and South Africa ; Luhea, of tropical and subtropical America ; Tilia, of Europe, temperate Asia, and North America ; Prockia, Hasscltia, Vallea, Sloanea, of tropical America ; Arutofelia, of Chili and New Zealand ; El regular, usually terminal, in racemes, panicles, corymbs, heads, fascicles or spikes. CALYX persistent, imbricate in aestivation, of 5 entire sepals, or rarely 4-partite with 3-fid lobes (Radiola}. PETALS clawed, usually 5, rarely 4 (Radiola), claw naked, or furnished with a sort of crest (Anisadenia, Reinwardtia), inserted on the torus, contorted in sestivation, caducous. STAMENS equal and alternate with the petals, sometimes accompanied by as many toothed staminodes opposite to the petals ; filaments flattened-subulate, usually connate into a short cup furnished on the out- 294 XL. ERYTHKOXYLE.E. side with 5 little glands, sometimes 0 (Radiola) ; anthers introrse, 2-celled, linear or oblong, basi- or dorsi-fixed, dehiscence longitudinal. OVAEY usually 5-celled, rarely 4-celled (Radiola) or 3-celled (Anisadenia, Reinwardtia) , cells subdivided by a more, or less perfect dorsal septum ; styles 5, rarely 4-3, filiform, free ; stigmas simple, linear or sub-capitate ; ovules 2-*4 ?, pendulous, anatropous. CAPSULE globose, enveloped by the persistent calyx and androecium, tipped by the style-base, septici- dally dehiscing into as many cocci as cells, or into twice as many by the splitting of each through the dorsal septum. SEEDS pendulous, compressed ; testa coriaceous, shining when dry, and developing in water an abundant mucilage ; albumen copious, scanty, or 0. EMBRYO straight ; cotyledons flat ; radicle contiguous and parallel to the hilum, superior. PRINCIPAL GENERA. *Linum. Radiola. [Lineai, including Erythroxylew, are thus divided in the 'Genera Plantarum ' : — TRIBE I. EULINE.E. — Petals contorted, fugacious. Perfect stamens as many as petals. Capsule septicidal, rarely indehiscent and 1-seeded. Radiola, Linum, Reinwardtia, Anisadenia. TRIBE II. HUGONIEJ;. — Petals contorted, fugacious. Stamens all antheriferous, twice or thrice the number of petals. Drape indehiscent. Hugonia, Roucheria. TRIBE III. ERYTHROXYLE^:. — Petals at length deciduous, imbricate, rarely contorted, with a villous line or ridge on the inner face. Stamens all antheriferous, twice as many as petals. Drupe mdehiseent. Erytltroxijlon, &c. TRIBE IV. TRIONANTHE.E. — Petals persistent, contorted. Stamens twice or more than twice as many as the petals. Capsule septicidal. Durandea, Sarcotheca, Phyllocosmus, Xoran- thus, &c. — ED.] Linea are closely related to JZrythro.vyfas, and more or less to Cfcraniacets and O.mlidea (see those families). They approach the latter in polypetalism, hypogynism, contorted corolla, clawed caducous petals, false diplostemony (Arerrhoa), filaments connate at the base, 6-celled ovary with pendulous anatropous ovules, free styles, capitate stigmas, and capsular fruit; hut O.ialidepei). The slightly bitter leaves of O. sensitiva are tonic and stimulating; its root is recommended for calculous diseases find scorpion-bites. The berries of Averrhoa Carambola, an Indian tree, are very acid in a wild state, but cultivation renders them sugary-acidulous and eatable. Those of A. Bilimbi are more tart than the preceding, and are only eatable when cooked and mixed with other condiments. The leaves of both these species are used to hasten the ripening of tumours. XLII. HUMIRIACE^E? Jussieu, [TREES or SHRUBS, mostly with balsamic juice, glabrous or puberulous. LEAVES alternate, simple, coriaceous, entire or crenulate ; stipules 0. FLOWERS regular, $j , white, in corymbiform, axillary, terminal, or lateral cymes. SEPALS 5, small, sub- connate at the base, imbricate in bud. PETALS 5, hypogynous, deciduous, slightly contorted. STAMENS lO-oo , hypogynous, more or less connate at the base ; filaments flattened or filiform, tips slender ; anthers versatile, cells 2, adnate to the base of a thick fleshy connective. DISK annular, truncate, toothed or of separate scales, closely girding the base of the ovary. OVARY free, sessile, 5- rarely 6-7-celled ; style simple, filiform ; stigma entire or obscurely toothed ; ovules solitary in the cells, or 2-3 suspended by unequal funicles from the top of the inner angle of the cell, anatropous, raphe ventral. FRUIT a drupe ; endocarp bony or woody, cells usually in part suppressed. SEEDS solitary, or geminate and then separated by a transverse septum, oblong, pendulous ; testa membranous; albumen copious, fleshy. EMBRYO axile ; cotyledons short, obtuse ; radicle usually elongate, superior. PRINCIPAL GENERA. Vantanea. Ilumiria. Sacoglottis. Aubrya. A small order, formerly associated with Ebcnncea; or Ol&inea ; but differing from the latter in aesti- vation, ovary, ovules, etc., and from Ebenacea in polypetalism, hypogyny, &c. They appear to be more closely allied to the tribe I.riotianthca? of Linea, from which their habit and anthers distinguish them. From the 1-2-ovuled genera of Meliaceai they are distinguished by their stamens, simple leaves, &c. 1 This order is omitted in the criginal. — ED. XLIII. MALPIGHIACE^. 299 Humiriacece are natives of Guiana and Brazil, with the exception of one tropical African species. The above four genera comprise about twenty known species. The Balsam of Unieri, which possesses the properties of the Peruvian1 and of Copaiva, is the produce of Humiria floribunda, a native of Brazil. A preparation of the juice both of this and H. balsamifera has the odour of Storax, and is made into an ointment used for pains in the joints, and used internally as a remedy for fcenia and haemorrhage. — ED.] XLIII. MALPIGHIACE^.Jussieu. JtfaJpiffhia. Seed cut vertically (mag.) Halpighia aquifolia. MaJpighia. Afalpighia. Fruit (mag.). Fruit cut vertically (mag.). M. fememco. Part of fruit cut transversely (mag.). M. punicifolia. Transverse section of fruit. Alalpiyhia. Flower (mng.). L'iicea. Fruit. Banister ia. Fruit. 300 XLIIL MALP1GHIACE.E. CALYX o-merous, persistent, segments usually biylandular. PETALS 5, usually unguicitlate, isostemonous or diplostemonous, inserted either on the receptacle or on a hypogynous or perigynous disk. STAMENS inserted with the petals, usually monadelphous, when several are antherless. OVARY composed of 3 or 2 carpels, connate, or distinct at the top, of3 or 2 1-ovuled cells. OVULE nearly orthotropous. FRUIT a drupe, or of 3-2 cocci. EMBRYO exalbuminous. STEM woody. $ TREES or SHRUBS, rarely UNDERSHRUBS, often climbing ; branches usually pubes- cent; hairs fixed by the centre and stinging, or silky, of metallic lustre, close- pressed, and not stinging. LEAVES generally opposite, petiole jointed to the stem, entire, flat (rarely alternate, or whorled, sessile, sinuate-toothed or -lobed, margins recurved) ; petiole or under surface or margin of the leaf often glandular ; stipules usually geminate at the base of the petiole, below (rarely above) the joint, generally rudimentary or suppressed, rarely large, sometimes the 2 belonging to the same leaf coherent in 1 and axillary, sometimes the 4 of 2 opposite leaves joining in pairs so as to form 2 interpetiolar stipules. FLOWERS § , or polygamous by suppression, sometimes dimorphous (Aspicarpa,Janusia], axillary or terminal, in a corymb, umbel, raceme or panicle ; peduncle bracteate at its base ; pedicels jointed, 2-bracteolate below the joint. CALYX 5-partite, segments imbricate, or very rarely valvate, all or 4 or 3 biglandular outside. PETALS 5, inserted on the receptacle, or on a hypogynous disk, or on a disk lining the base of the calyx, generally equal, fringed or toothed, claw slender, aesti- vation imbricate. DISK inconspicuous. STAMENS usually 10, hypogynous or sub- perigynous, all fertile, or some anantherous, or one or more or all of those opposite the petals wanting ; filaments filiform or subulate, usually connate at the base; anthers short, introrse, cells sometimes winged, connective often thickened, sometimes pro- longed at the top into a glandular appendage. OVARY free, composed of 3 (rarely 2) carpels; coherent, or distinct at the top, of 3-2 1-ovuled cells; styles 3, inserted between the lobes of the ovary, distinct or connate ; stigma simple, inconspicuous ; ovule nearly orthotropous, pendulous by a short funicle to the inner angle of the cell or middle of the septum, ascending, erect or curved, raphe ventral, micropyle superior. Ripe CARPELS 3 or fewer, 1 -seeded, sometimes connate into a fleshy or woody drupe, sometimes distinct, and separating into usually winged samaras, rarely 2-valved. SEEDS obliquely pendulous below the top of the cell, exalbuminous ; testa double, usually membranous. EMBRYO straight, curved, or hooked, very rarely annular ; coty- ledons flat or thick, gften unequal ; radicle short, above the hilum, superior. PRINCIPAL GENERA. *AIalpighia. 'Stigmaphyllon. 'Banisteria. Iliptage. Hirsea. Aspicarpa. [The following is the disposition of the tribes, &c., of this large family, pro- posed by the authors of the ' Genera Plantarum' : — TRIBE I. MALPIGUIEJ:. — Stamens 10, usually all perfect ; anthers mostly appendiculate ; styles usually 3, free. Carpels on a flat torus, never winged, free or connate into a fleshy or woody drupe. — Usually erect, with opposite leaves and connate stipules. Byrsonima, Mai- :!», Tliri/nU!.i, Galpliinid, Spacltea, &c. XLIV. COKIARIE^E. 301 TRIBE II. BANISTERIE.E. — Stamens 10, usually all perfect; anthers appendaged. Styles normally 3, free. Fruit of 1-3 dorsally (not laterally) winged nuts or samaras on a conical torus (rarely wingless or feathery). — Usually climbers, with often alternate exstipulate leaves. Heteropterys, Acridocarpus, Brachypteris, Stigmaphyllon, Eyssopteris, Banistcria, Peixotoa, &c. TRIBE III. HIRE^. — Stamens usually all perfect. Styles normally 3, free. Samaras 1-3, on a pyramidal torus, 1-7-winged, lateral wings broad. — Usually scandent, with often alternate exstipulate leaves. Tristellateia, Hiptage, Aspidopterys, Triopterys, Tetraptorys, Hircea, &c. TRIBE IV. GAUDTCHAUDIE^E. — Stamens 8 or fewer, some or all of those opposite the petals, and sometimes others, anantherous. Style 1. Carpels winged or not, usually pendulous from a raphe-like thread. — Erect or climbing ; leaves often alternate. Flowers often dimorphic. Calyx 8-10-glandular. Gaudichaudia, Aspicarpa, Camarea, Janusia, Scliuannia. — ED.] Malpiyhiacece are near EryHHroxyletB (which see), Acerinece and Sapindacecc ; they are separated from Accrinctc by their glandular calyx, long clawed petals, monadelphous stamens, usually 3-merous fruit, 1-ovuled ovarian cells, curved ovules, and superior radicle. The affinity is still more close with Sapin- dacces, from which they only differ in the inconspicuous disk and solitary abnormally-formed ovules. Malpighiaceee mostly inhabit the plains and virgin forests of the southern tropic of America ; they are lesa numerous beyond this region, rarer still in equatorial Asia, and very rare in Africa and Australia. Many Malpigliiaccai owe to the colouring matter and tannin contained in their bark astringent properties, which are useful in various disorders, and especially in dysentery and intermittent fevers ; as the different species of the American genus Byrsonima. The acidulous-sugary fruits of Malpiyhia urens and ylabra are recommended as refreshing and antiseptic. XLIV. CORIARIE^E, Endlicher. PETALS 5, hypogynous, small, fleshy . STAMENS 10, hypogynous. OVAKY 5-lobed, cells alternate with the petals, \-ovuled. STYLES 5, sti^matiferous throughout their length. FRUIT of 5 carpels. EMBRYO scarcely or not albuminous. — STEM woody. LEAVES opposite. Unarmed SHRUBS, branches angular, the lower opposite or ternately whorled, the upper opposite, often sarmentose ; buds scaly. LEAVES opposite, rarely ternately whorled, ovate or cordate or lanceolate, 1-5-nerved, entire, glabrous, exstipulate. FLOWERS 5 or polygamous, in terminal [or axillary] racemes ; pedicels opposite or the upper alternate, bracteate at the base, and often 2-bracteolate. SEPALS 5, oval- triangular, imbricate in bud, persistent, spreading, margins membranous. PETALS 5, hypogynous, shorter than the sepals and alternate, triangular, fleshy, keeled within, accrescent, persistent. TORUS conical, fleshy, lobed. STAMENS 10, hypogy- nous, free, or the inner adnate to the keel of the petals ; filaments short, filiform ; anthers large, introrse, basifixed, dehisceiice longitudinal ; pollen very fine, subglo- bose. CARPELS 5-10, free, oblong, whorled on the torus, conical, altercate with the petals, 1-ovuled ; styles as many as carpels, free, thick, elongated, distant, entirely covered with.stigmatic papillae; ovules pendulous from the top of the cells, anatro- pous, raphe dorsal. FRUIT of 5-8 indehiscent cocci, embraced by the accrescent and fleshy petals, compressed, oblong ; pericarp crustaceous, keeled on the back and sides. 302 XLIV. COBIAKIE^. Coriaria. Vertical section of flower (mag.). Coriaria. Flower deprived of its calyx (mag.). Coriaria, Carpel, entire and cut vertically (mag.). Coriaria, Seed, entire and cut vertically (mag.). Coriaria. Fruit. Coriaria. Carj>el cut transversely (mag.). SEEDS compressed ; testa membranous ; albumen thin or 0. EMBRYO straight, ovoid, compressed ; cotyledons plano-convex ; radicle very short, obtuse, superior. ONLY GENUS. *Coriaria. The affinities of Coriaria are very obscure. It hns been placed near Malpighiacea (see this family). It somewhat distantly recalls Hittaceo! and Zantho.rylea; in its hypopetalism, diplostemony, free carpels, &c., but is separated from them by its pendulous ovule \vith dorsal raphe and superior micropyle. Compared with Sapindaceee and Terebmthacece, it differs in habit, the inner stamens usually adherent to the petals, nnd the styles stigmatiferous throughout their length. It has some analogies with Phytolacea, founded on the distinct and whorled carpels, papillose styles and fruit [but differs in the petals, pendulous ovules, fleshy albumen (when present), and straight thick embryo]. Coriaria comprises a few species, dispersed over the Mediterranean region, Nepal, Japan, New Zealand, nnd western South America. C. myrtifolia (Myrtle-leaved Sumach), which grows especially in the West of the Mediterranean region, abounds in tannin, utilized by curriers ; its leaves nnd fruits contain a narcotic- acrid crystallizable principle (coriariine) which renders them poisonous. These leaves are used to adul- terate senna, which is thus often a fatal medicine. The fruit of C. sarmentosa, a New Zealand shrub, is full of a vinous juice, which the natives and colonists drink with impunity, taking care not to swallow the seeds, which are eminently poisonous. The same may be said of C. nepalcnsis. 6'. riiscifolia, of China, yields" a black colour, used by shoemakers. XLV. ZYGOPHYLLE^. 303 XLV. ZYGOPHYLLEsE. (EUTACEAEUM sectio, Jussieu. — ZYGOPHYLLE^E, Br. — ZYGOPHYLLACE^E, Lindl.} Zygophyllum. Part of flower (mag.). Zygophyllum. Ovule (mag.) Zygophyllum Stamen and scale (mag.). Zygopliyllum. Diagram. Seetzenia. Seed cut vertically (mag.) Seetzenia orientalis. Flower (mag.). Zygophylltim Fabayo. Tributes Tributes. Seed, entire and cut vertically (mag.). - Fruit, entire and cut vertically. 304 XLV. ZYGOPHYLLE^. Tribulus terrenlrit. Tribuliu. Vertical section of flower (mag.). CALYX 4-5-raerows, generally imbricate. PETALS kypogynous, usually imbricate. STAMENS usually double the number of the petals, hypogynous ; filaments usually with a scale inside. OVARY several-celled. FRUIT a loculicidal capsule, septicidally dividing into cocci. EMBRYO exalbuminous, or enclosed in a cartilaginous albumen. — Scentless plants. LEAVES opposite, pinnate, stipulate. HERBS, SHRUBS or TREES ; branches often divaricate and jointed at the nodes. LEAVES opposite, or alternate from the suppression of one, stipulate, compound, sometimes pinnate or imparipinnate, sometimes 2- (rarely 1-) foliolate (Zygophyllum) ; petiole sometimes flattened and winged ; leaflets sessile, entire, not punctate, often inequilateral, flat, or fleshy, or terete ; stipules geminate at the base of the petioles, persistent, sometimes spinescent. FLOWERS ? , regular or irregular, white, red or yellow, rarely blue ; peduncles usually 1-2, springing from the axil of the stipules, 1 -flowered, ebracteate. SEPALS 5-4, usually persistent, free, rarely connate at the base, aestivation imbricate or very rarely valvate (Seetzenia}. PETALS 5—4, very rarely 0 (Seetzenia), hypogyiious, free, aestivation usually imbricate, sometimes contorted (Zygophyllum) ; disk hypogynous, convex or depressed, rarely annular (Tribulus), sometimes inconspicuous (Fagonia, Guaiacum, &c.), or 0 (Seetzenia). STAMENS usually double the number of the petals, rarely equal (Seetzenia), inserted on the re- ceptacle, 2-seriate, the outer opposite to the sepals ; filaments filiform, usually with a small scale on the base within, or on their centre ; anthers introrse, dorsifixed above their base, versatile, dehiscence longitudinal. OVARY free, sessile, or rarely borne on a short gynophore (Larrea, Guaiacum), furrowed, angular, or winged, 4-5- (rarely 10-12-) celled (Tribulus, Augea), or 2-3-celled (Zygophyllum), cells sometimes XLVI. BATIDE^l. 305 divided into several by transverse septa (Tribulus} ; style simple, terminal, angular or furrowed, sometimes short or 0 (Tribulus} ; stigma simple ; ovules 2, superimposed in each cell, or several 2-seriate, pendulous or ascending, raphe ventral, and micropyle superior. FRUIT coriaceous or crustaceous, sometimes septicidal, and dividing into 2-10 dehiscent or indehiscent cocci, which are connate, or separable from the placental column ; sometimes a loculicidal capsule. SEEDS usually solitary in each cell, rarely 2 or several, pendulous ; testa membranous or crustaceous, or thick and mucilaginous; albumen cartilaginous, rarely 0 (Tribulus, &c.). EMBRYO green, straight or slightly curved ; cotyledons foliaceous ; radicle short, straight, superior. PRINCIPAL GENERA. Tribulus. *Zygophylluin. Larrea. Porliera. *Fagonia. Guaiacum. PNitraria. Zygophyllea are near Geraniaceee and Oxalideee (see these families). They are connected with Rutacece by their hypopetalism, diplostemony, several-celled ovary, hypogynous disk, loculicidal or septicidal capsule, albuminous seeds, straight or arched embryo, and superior radicle ; but Rutacece differ in habit, alternate and glandular-dotted exstipulate leaves, eglandular filaments, and basilar style. The genus Nitraria, doubtfully placedhere byBentham and Hooker fil., certainly approaches them in its stipulate leaves, oblong anthers, and the structure of its ovary ; but it is separated by its habit, simple leaves, valvate induplicate corolla, naked filaments, one-ovuled cells of the ovary, and drupaceous fruit. Zygo- phyllea scarcely differ from Simarubece, except in their ovary attenuated into a simple terminal style. Batidf regular, terminal, in racemes or a corymb, yellow, or sometimes white. CALYX persistent, 4-5-partite, aestivation imbricate. PETALS 4-5, inserted at the base of a shorter or longer gynophoae, sestivation imbricate. STAMENS inserted with the petals, generally double, sometimes triple (Peganum), rarely equal (Thamnosma) in number; filaments filiform, free, or sometimes shortly monadelphous, base often dilated; anthers iiitrorse, connective sometimes glandular at the tip (Haplophyllum) , de- hiscence longitudinal. OVARY deeply 2-3-5-lobed, 2-3-5-celled, seated on a gynophore usually dilated at the base into a glandular disk ; styles central, sometimes distinct at the base and top (Bcenninghausenia], usually connate, stigmatiferous at the top, or on the angles ; ovules 3-4-oo in each cell, inserted on a projecting placenta at the inner angle of the cell, 2-seriate, anatropous or seini-anatropous. FRUIT a capsule, sometimes opening in 3-4 loculicidal valves (Peganum), sometimes in 4-5 lobes opening at the top (Ruta), sometimes fleshy and indehiscent (Ruteria), sometimes separating into cocci (Dictamnus, Boenninghausenia) , eiidocarp sometimes crustaceous or cartilaginous, and separating from the epicarp (Dictamnus). SEEDS pendulous, or ventrally fixed ; testa crustaceous or spongy, pitted and granular ; albumen fleshy. EMBRYO axile, curved or rarely straight (Dictamnus) ; radicle superior. *Euta. PKINCIPAL GENERA. Peganum. *Dictanmus. *Bcenninghausenia. Rutacete are very closely allied to Diosmees, which can only be distinguished from them by the woody stem, the 2-ovuled ovarian cells, and the usually straight embryo. They also approach Zygophyllw, 318 LIT. AURANTIACE.E. e, and Simartibea (see these families). Bentham and 1 looker fil. have united with trtieni Aurantieee and Zantko.rylea> (see these families). Jtiifdcete all belong to the Old World ; they especially abound in the north temperate hemisphere, the shores of the Mediterranean, and South Siberia ; and they become very rare towards the poles and equator. Baattnwghausenia inhabits the Himalayas and Japan. Itvtacete owe their stimulating properties to a bitter substance, a resinous acrid principle, and especially to a volatile oil, secreted by the glands of the leaves and flowers. The Rue (Ruta yraveolens), a native of the Mediterranean region, and cultivated in all gardens, is remarkable for its strong smell and acrid taste, and its essence, obtained by distillation, is employed as a sudorific, vermifuge, and emmen- agogue. Vinegar of Rue was regarded during many centuries as a certain remedy against the plague. The Romans used Rue as a condiment, as do the Germans still. Jtuta montana, which grows in Spain, is so extremely acrid that it produces erysipelas and ulcerous pustules on the skin of those who gather it. Haplophyttum tulerculatum is so much less acrid that the Egyptian women bruise its leaves in water, and use it as a hair-wash. The peduncles and flowers of the European Dittany (Dic-tamnna albus) are laden with pedicelled glands whicli secrete an abundant volatile oil so copiously that the plant ignites at the approach of a candle; its resinous scented and bitter root is tonic and stimulating. Per/anum JIarmala grows in sandy soil ia the Mediterranean region ; its smell is repulsive and its taste acrid and bitter ; the Turks use its seeds as a condiment, and obtain a red dye from them. LII. AURANTTACE^E. (AURANTIORUM scctio, Jussieu. — HESPERIDEAEUM sectio, Ventenat. — AURANTIACE^E, Correct.} Grange. Vertical section of flower (mag.). Orange (Citrus Aurantium). Orange. Orange. Fart of aiidroDcium (mag.). Calyx and ovary (mag.). LII. AURANTIACE^L 319 Orange. Transverse section of fruit. Orange. Calyx and andrceciura (mag.). Orange. Calyx and pistil (mag.). Bergera. Flower without corolla (mag.). Bergera. Vertical section of ovary (mag.). Orange. Seed, entire and cut (mag.). PETALS hypogynous, aestivation imbri- cate. STAMENS hypogynous, double or multiple the number of the petals, free, monadelphous or polyadelphous. OVARY several-celled. OVULES 1-2 or more in each cell, pendulous or horizontal, anatropous. FRUIT a ~L-many-seeded berry. EMBRYO exalbuminous. — STEM woody. LEAVES alternate, imparipinnate or \-foliolate. TREES or SHRUBS, usually glabrous ; bark, leaves, calyx, corolla, filaments and epicarp covered with vesicles containing a volatile oil. LEAVES persistent, alternate, compound, often 1-foliolate by suppression, with the leaflet jointed, or the top an often winged petiole ; stipules 0 ; buds axillary, the outer often spinescent. FLOWERS generally $ , regular, terminal, solitary, or corymbose or racemed. CALYX short, urceolate or campanulate, 4-5- toothed or -fid, rarely 3-fid (Triphasia], some- times nearly entire, imbricate in aestivation, marcescent. PETALS inserted below the ovary at the base of a stipitiform, annular or cupulifbrm disk, free or slightly 'connate at the base, imbricate in aestivation, deciduous. STAMENS inserted on the receptacle, double or multiple the number of the petals ; filaments free, or mona- delphous at their base or to the middle, or polyadelphous, linear-subulate, usually dilated, thinner above, equal or the alternate shorter ; anthers introrse, dorsi- or basi- fixed, incumbent, dehiscence longitudinal. OVARY free, sometimes girt by the cupuliform disk, 5-many-celled ; style terminal, simple, stout ; stigma capitate, undivided or lobed ; ovules inserted at the inner angle of the cells, solitary or 2, collateral or superimposed, or numerous and 2-seriate, pendulous or rarely hori- zontal, anatropous. BERRY fleshy or dry, bark thick, indehiscent, of 2 or several usually 1 -seeded cells filled with mucilage or vesiculose cellules. SEEDS inverted or sub-horizontal, testa membranous, raphe branching, chalaza coloured ; albumen 0. EMBRYOS (sometimes several in each cell) straight ; cotyledons either fleshy, amyg- daloid, plano-convex, often unequal, or thick, green, lobulate, auricled ; radicle short, near the hilum, superior. •Triphasia. PRINCIPAL GENERA. *Limonia. *Murraya. *Cookia. 'Citrus. 320 LII. AURANTIACE^. Auraatiaceee have been united by Lindley and Hooker and Bentham to Rutacece, Diosmece, and Zantho.iijlece, with which they are, in fact, closely allied, these latter being scarcely separated, except by their more or less distinct carpels with a basilar or ventral style, by their capsular fruit and albuminous seed ; and even these differences disappear in many Diosmece which are exalbuminous, and in some ZanthoxylefB which have a fleshy fruit ; a genus of the latter family, Skimmia, has in fact been classed among Awantiaccee, and placed in the genus Limonia. Aurantiacecc approach Mdiacece in the petals inserted at the base of a hypogynous disk, in the connate filaments, several-celled ovary, simple style, fleshy fruit, woody stem and alternate leaves ; but in Meliacece, besides the difference in habit, the leaves are eglandular, the sepals are more or less distinct, and the seed is sometimes albuminous. Cedrelacecc are connected with Aurantiacccc through the genus Flindersia, the leaves of which are dotted, the stamens inserted at the base of the disk, and the embryo albuminous ; the principal difference is the capsular fruit of Flindersia. llumiriacecc are also connected with Aurantiacece by most of the characters, and /ire scarcely separated save by their anthers, drupaceous fruit, and abundant albumen. liurscracccc are also related to them, especially the genus Amyris, and are distinguished by their drupaceous fruit. Finally, an affinity has been noticed by Planchon between Aurantiacece and Hyperidnece, founded on the glandular leaves and flowers, hypogynous petals, polyadelphous stamens, sometimes fleshy fruit ( Vismia), and exalbuminous embryo. The same observation holds good for Myrtacece, and especially for the gt;nera with free ovaries (Fremya). Auraniiacffe are almost wholly tropical Asiatic, but various species are now cultivated in the warm regions of both continents. The wide-spread celebrity of the genus Citrus from the earliest times is firstly due to the free acids (citric and malic) contained in the cells of its parenchyma, which fill the fruit ; and secondly, to the sweet and pungent volatile oil secreted by the glands which abound in nearly all parts of the plant. The acids are used in domestic economy and in medicine, as refreshing, laxative, and antiseptic. A small quantity of the aromatic principle dissolved in water, by infusion of the leaves or distillation of the flowers, affords a stimulating antispasnnodic. The volatile oil, obtained by distillation of the flowers and epicarp, is employed in perfumery, either mixed witli fat as a pomade, or dissolved in alcohol as the cosmetic known as eau de Cologne. The Orange (Citrus Atiranliiim) is universally sought for its acid-sweet fruit. The Seville Orange (C. dommunis) has a bitter fruit, but it is not less useful ; its leaves are used in infusions; its flowers yield the distilled water so much used in medicine, and the volatile oil railed essence of Neroli. From its young fruits, gathered soon after flowering, is distilled a Neroli oil called essence ' de petit grain.' The epicarp of the Seville or bitter Orange is used in the preparation of a dye ; it is also made into a syrup and a marmalade, and is one of the principal ingredients of the highly esteemed liqueur Curacoa. The ' Cedrat " (C. medico l) bears large oblong fruits with a rough surface; the rind yields a perfume by expression or distillation ; the inner rind is thick and fleshy, and a pleasant preserve is prepared from it. The Lemon (-hrub, called Khat, cultivated by the Arabs, with whom it is an article of commerce ; the bruised leaves produce an agreeable excitement, analogous, it is said, to that induced in Peru by the use of coca ; it is also lauded by them as a sovereign remedy for the plague. [In India the bark of Euonymus tingens is used to dye a yellow colour, with which the Hindoos make the sacred mark on the forehead ; it is alsoaised in eye complaints The bark of E. Roxburgh ii is an astringent, used to reduce swellings in India. The seeds of the European Euonymi are nauseous and purgative, and said to poison sheep ; an ointment made of them was formerly used to kill lice in the head. The spines of Cda&tnts venerntus are said to inflict a poisoned wound. The drupes of Elaodendron Kula are eaten in South Africa by the colonists. The seeds of Celastnu nutans and paniculatui are acrid and stimulant, and used as a medicine in India. Of the Hippocrateacece the fruit of Salacia jn/riformis, a native of West Africa, is eatable, as are the nuts of Hippocratia comosa, the ' Amandier du Bois ' of the French West Indies. The fruits of others are mucilaginous and edible. — ED.] LXIV. STAPHYLEACE^E.1 (CELASTRINEARUM tribus, D.C. — STAPHYLEACE^E, Bartling.) COROLLA polypetalous, sub-hypogynous, isostemonous, aestivation imbricate. PETALS 5, inserted on a hypogynous disk. STAMENS 5, inserted with the petals. OVARY 2-8- lobed. OVULES anatropous. YRUIT dry or fleshy. EMBRYO albuminous. — STEM woody. LEAVES compound, bistipulate. TREES or erect SHRUBS. LEAVES generally opposite, 3-foliolate, or impari- pinnate ; leaflets opposite, petiolulate ; stipules twin, at the base of the petioles, deciduous. FLOWERS g or imperfect, regular, racemed or panicled, pedicels brac- teate at the base. CALYX free, coloured, 5-partite, aestivation imbricate. PETALS inserted on or beneath a hypogynous disk, crenulated, aestivation imbricate, deciduous. STAMENS 5, inserted like the petals ; fllaments subulate, free, equal ; anthers introrse, opening longitudinally. CARPELS 2-3, united at the base, or throughout their length, into a 2-3-celled and -lobed ovary ; styles equal in number to the lobes of the ovary, distinct or cohering, finally free ; stigma undivided ; ovules many, inserted along the ventral suture, 1-2-seriate, horizontal or ascending, ana- tropous. FRUIT a membranous turgid capsule, its lobes opening at the top by the ventral suture ; or a berry, 3-celled, or 2-celled by suppression. SEEDS few or solitary 1 See Sapindacea?, Sub-order V., p. 353. LXIV. STAPHYLEACE.E. 345 Staphylea. Seed (mag.)- Staphylea. Seed cut parallel to the cotyledons. Staphylea. Seed cut perpendicularly to the coti'ledons. Staphylea. Pistil (m.og.). Staphylea. Seed cut transversely. Mitphylea piniiata. Staphylea. . , ,, , -, vertical section of flower in each ceil, globose, truncate at the base; testa bony, shining. EMBRYO stiaight, in a fleshy scanty albumen, reduced to a thin layer when ripe ; coty- ledons thick, fleshy, plano- convex; radicle short, inferior Staphylea. Diagram. Or Centrifugal. PEINCIPAL GENERA. Euscaphis. Staphylea. Turpinia. Stapliykacea, joined by De Candolle to Celastrinece, nve connected with them by the polypetalous isostemonous corolla, imbricate aestivation, fleshy disk on which the petals and stamens are inserted, as- cending and anatropous ovules, woody stem and stipulate leaves ; but Celastrinea have simple and alternate leaves, usually arillate seeds, and a copious albumen. A still more legitimate affinity links Staphyleacea with Sapindacea and Acerinece ; for in the latter the petals are imbricate, and inserted, like the stamens, on a flashy hypogynous disk, the ovary is two-lobed and of two carpels, the fruit is a capsule, the seeds are ascending, and scarcely or not albuminous, the stem is woody, and leaves opposite. There is the same relationship with SapindacceB, in many genera of which the leaves are stipulate, though not opposite. 346 LXV. STACKHOUSIE^J. These two families are. scarcely separated from Staphyleaceee except by the diplostemonous corolla and curved embryo ; and they are united in the ' Genera Plantarum ' as tribes of Sapindaccee. It is the same in Hippocnstanece (see this family). The few species of this little family are scattered over temperate Europe, North America, the Antilles, Mexico, Japan, and tropical Asia. Their useful properties are little known. The root of a Japan shrub (Emcaphis) is employed as nn astringent in dysentery. [The seeds of Slaphyka are oily, austere, and slightly purgative. — ED.] LXV. STACKHOUSfE^E.1 [Small HEEBS with watery juice, usually woody, simple or branched, rootstocks giving off many erect simple or sparingly divided slender leafy branches., LEAVES scattered, alternate, rather fleshy or coriaceous, linear or spathulate, quite entire ; stipules 0 or very minute. FLOWERS 5 , regular, in terminal spikes or racemes at the ends of the branches, or fascicled, 3-bracteate, white or yellow. CALYX small, hemispheric, 5-lobed or -partite, lobes rather unequal, imbricate in bud. PETALS 5, perigynous, inserted on the throat of the calyx, linear or spathulate ; claws long, free or connate ; limb reflexed, imbricate in bud. .DISK thin, clothing the base of the calyx-tube. STAMENS 5, inserted on the edge of the disk, erect, included; filaments slender, the alternate shorter ; anthers oblong, dehiscing longitudinally ; pollen obscurely 4-lobed, rough. OVARY sessile, free, sub-globose, 2-5-lobed or -partite, 2-5-celled ; styles 2-5, free or connate ; stigma 5-lobed or stigmas 5, capitate ; ovule solitary in each cell, erect from its base, anatropous, raphe ventral. FRUIT of 2-5 globose or angular sinoolh or reticulate or winged indehiscent 1-seeded cocci, which separate from a central persistent column. SEED erect; testa membranous; albumen fleshy. EMBRYO axile, straight, as long as the albumen ; cotyledons short, obtuse ; radicle inferior. ONLY GENUS. Stackhousia. A small and geographically limited order, embracing some twenty species, common in extra-tropical Australia, with a solitary representative in New Zealand, and another that wanders north to the Philippine Islands. It appears to agree most nearly with Cclastrhieee in technical characters, but its affinities are quite unknown. In the disk and fruit it approaches Rhamnea. Robert Brown indicated an affinity with Euphorbiacece, but on what grounds is not stated, nor have these been apparent to succeeding botanists. Nothing is known of its uses. — ED.] LXVI. RHAMNEsE. (RHAMNORUM genera, Jussieu.— RHAMNEJD, Br. — FRANGULACE^E, D.C. — RHAMNACE^E, Lindl.) COROLLA polypetalous, perigynous, isostemonous, (estivation valvate. PETALS 4-5, inserted on a perigynous disk, lining the calyx, and sometimes the ovary also. STAMENS 4-5, opposite to and inserted with the petals. OVARY free, or adnate to the disk, of . ' Thii order is omitted in LXVI. KHAMNE.E. 347 2-3-4 I-2-ovuled cells. OVULES erect, anatropous. FRUIT a drupe or capsule. EMBRYO large, albumen scanty. — STEM woody. LEAVES simple, 2-stipulate. Rhamnus. Flower (mag.)- Rhamnus. Vertical section of flower (mag.). Rhamnus. Pistil (mag.). R. f'ranyiila. Transverse section of a seed with plane cotyledons (mag.). Buckthorn. (Rhamnus Frangula.) Rhamnus. Vertical section of a seed with lateral raphe (mag.). R. utilii. Section of a seed with dorsal raphe and bent cotyledons (mag.). TREES, SHRUBS, or UNDERSHRUBS, branches sometimes spinescent, sometimes climbing by their extremity, which is bare of leaves (Gouania}. LEAVES simple, usually alternate, rarely sub-opposite or opposite, entire or toothed, petioled, some- times minute or suppressed (Colletia) ; stipules small or 0, sometimes transformed into thorns. FLOWERS 2 or unisexual, regular, small, greenish, usually axillary, solitary, or variously fascicled. CALYX 5-fid or -partite, aestivation valvate. DISK adnate to the calyx, and lining it with a single or double layer, of various form. PETALS 4-5, usually inserted at the edge of the disk, aestivation induplicate-valvate, rarely 0 (Colletia, Pomaderris). STAMENS 4-5, opposite to and inserted with the petals ; filaments sometimes adnate to the base of the petals, but not connate ; anthers introrse, dorsifixed, versatile, sometimes ovoid, with longitudinal dehiscence, sometimes reniform and 1-celled by confluence of the cells at the top, and opening 348 LXVI. KHAMNE^. into 2 valves by an arched slit. OVARY free, or buried in the disk, or more or less adnate to the calyx-tube, of 3-2-4 1-2-ovuled cells ; styles equal in number to the cells, more or less connate ; stigmas simple, distinct or connate ; ovules usually solitary in each cell, erect, sessile or funicled, anatropous. FRUIT superior or inferior, rarely 1 -celled by suppression, sometimes an indehiscent fleshy spongy or membranous drupe, sometimes winged, with a hardv fibrous or woody 2-3-celled endocarp, sometimes a capsule with 2-3 crustaceous cocci separating at the top, pendulous from the axis, and opening when ripe at the base of their inner edge. SEEDS erect ; testa loose, raphe lateral or dorsal, chalaza thick ; albumen fleshy, scanty. EMBRYO large, straight, yellow or green ; cotyledons flat, fleshy ; radicle short, inferior. PRINCIPAL GENERA. Faliuriw. Zizyphus. Hovenia. Ilhamuus. Ceanothus. Phylica. Pomaderris. [Conspectus of the tribes and genera, from the ' Genera Plantarum ' of Bentham and Hooker fil. :— TRIBE I. VENTILAGINEJ:. — Ovary superior or semi-superior. Disk filling the calyx-tube. Fruit dry, 1-celled, 1-seeded, girt at the base or up to the middle by the calyx-tube. Seeds exallmminous. — Unarmed climbing shrubs. Leaves alternate. Ventttago, Smythea. TRIBE II. ZIXYNIK^. — Ovary superior or semi-superior. Disk filling the calyx-tube. Drupe dry or fleshy, girt at the base or up to the middle by the calyx-tube ; endocarp 1-3- celled. raliiims, Cowlnlea, BescJicmia, Zizyphus, Sarcoinplmlus, Karicinskia, Microrhammis. TRIBE III. RHAMNEJE. — Ovary inferior or superior. Disk various or 0. Fruit dry or drupaceous, containing 3—4 cocci or pyrenes. lihammis, Ceanotlius, Colulrina, Trymaliuni, Horpuia, Scutia, Pliylica, Spyi'tdmiti, Saycretia, Alphitunia, Cryptandra, Pomaderris. TRIBE IV. COLLETIEJE. — Ovary free or semi-superior. Calyx-tube deep, produced much beyond the disk. Stamens inserted on its mouth. Fruit coriaceous, of 2-3 cocci or a 1-3- celled drupe. — Trees or shrubs, often spinesccnt. Leaves opposite or small or 0. Colletia, Jliscaria, Retiwilln, Trevoa, TaJyncnea. TRIBE V. GOUANIEJE. — Ovary inferior. Disk various. Fruit coriaceous, containing 3 cocci, usually 3-gonous or 3-alate. — Shrubs. Leaves alternate, often broad. Crumenaria, Gonania, Helinua, Pcissekia. — ED.] The affinities of JUtantneee with Cclastniif.] B 13 2 872 LXXV. LEGUMINOS^. The extensive family of LeguminotO! is closely allied to A>nygdalea> (see this family). Mimosea obviously, as M. Planchon has demonstrated, approach OxaKdea, in which, as in many Mintosete, the corolla is diplostemonous, the sfamens monadelphous, the ovules anatropous, the embryo albuminous and straight, the seeds ai illate, and the leaves alternate, compound and irritable : but the calyx of Oxalideat is imbricate, the ovary 5-celled, the leaves are exstipnlate, and the stem is generally herbaceous (except in the genus Averrhoa). Pajnlionaceee are also near Terebinthacetg, which resemble them in habit, their alternate often compound leaves, perigynous stamens, often solitary ovary, carnpylotropous ovule, and exalbuminous embryo ; but which differ in their regular flower, free stamens, usually fleshy fruit, and exstipulate leaves; but here again the affinity is re- established by some Ctesalpineee (Ceratotria), which are apetalous and dioecious, like many Terebinlhaccar, and the flower of which is sub-regular, and the stamens nearly free. Mimosete abound in the tropical zone ; they are rare in the sub-tropical regions of the northern hemisphere, and are especially numerous in Africa and Australia. Tropical America produces a great number of species, belonging to the group of Inaa. Swartzieee inhabit intertropical America and Africa ; none have yet been met with in Asia. Papilio- nacefc are found in all climates, but they mostly grow between anduear the tropics, and in the Old World more than in the New. Some Antrtiyali ascend the highest mountains. Cfesalpinea; are numerous in tropical regions; they scarcely pass the tropic in the Old World, and are rather rare in North America. The order Leyuminove is extremely serviceable to mankind ; the farinaceous seeds of Papilionaceee are very nutritious, whilst their herbage forms an excellent fodder. LeffvminoteB also yield more substances used in medicine and the arts than any other order in the Vegetable Kingdom. We will enumerate the most important species, in their botanical order, and notice, in passing, certain noxious ones. Albizzia anthelminthica,&n Abyssinian tree, the bark of which is employed, against t&nia. Acacia vcra and arnbica, North-east African, Arabian, and Indian trees, produce gum arabic. A. J'erek, &'ff(il, and AdaMonti, Senegambian trees, produce gum Senegal, used similarly to gum arabic. A decoction of the wood of the Indian A. Catechu yields Catechu, a thick juice, soluble in water, which i $ an astringent tonic. Adetianthera pavonina, an Indian tree, of whose hard red seeds, named Kuara, necklaces and bracelets are made. Dctarium Senff/afense, a Seneg«mbian tree, yields an edible drupe. Swartzia tomcntota is a tropical American tree with a resinous sudorific bark. Ceratonia Siliqna (Carob). A tree of the Mediterranean region, whose lomentaceous fruit contains a russet insipid edible pulp, serving as forage in Spain [and extensively imported into England for cattle food]. Copaifera offirinali*, coriacea, cordifolia, £c. Trees of tropical America, yielding by incision of the trunk a turpentine called Balsam of Copaiba, used in catarrhal affections. Hymcnata rcrrucosa. A Madagascar tree, yielding a yellow resin named copal, which is insoluble in alcohol, but soluble after fusion in linseed oil, and then in essence of turpentine, and is much used as a varnish. Aloe.n/lon Ayallochum. A tree of Cochin China, whose veined resinous aromatic wood, called Aloe- wood, burns with a fragrant flame. Cassia obovata, acutifolia, lanceolata, &c., the Sennas, are plants of Upper Egypt, Syria, Arabia, Indin, and Senegal, the leaves of which contain an active purgative principle, much used in medicine ; their flattened pods are much weaker purgatives. C. fistula, an Indian tree, bears a woody indehiscent septate pod, named Cassia, the cells of which contain a sugary laxative black pulp. The seeds of C. Absus are used in Egypt to cure chronic ophthalmia. Tamanndus indica. A tree of India, West Asia, and Egypt, whose pulpy, acid, and sugary pods, called Tamarinds, are used in medicine. Heematoj-ylon campechianum, a Central American and West Indian tree, affords Logwood, which contains a colouring principle (hematinc), much used in dyeing black or dark red. ta, a Brazilian tree, yields Brazil- wood, containing a red colouring principle (brasiline). LXXV. LEGUMINOS^. 373 C". conacea, of tropical Asia, yields the very astringent pods [called Divi Divi], used in tanning leather. [C. Snppan yields the red Sappan-wood of Eastern India and Ceylon.] Castanospermum australe, an Australian tree, yields edible seeds called Australian chestnuts. Sophora tomentosa. A tree whose roots and seeds are used in India to arrest choleraic vomiting. The flowers of Styphnolobium japonicum are used in China as a yellow dye. Myroxylon peruifcrwn, a Peruvian [Central American] tree, yields a sweet-smelling liquid balsam, composed of a resin, an oil, and a peculiar acid (cinnamic). M. toluiferum, a Columbian tree, [is supposed to] produce the Balsam of Tolu, a similar substance, used in chronic pulmonary catarrh. Cwimarouna \_Dipte ryx~\ odorata, a Guiana tree with very hard and heavy wood, yields Tonquin Beans, which contain a very odoriferous crystallizable principle (coumarine), and are employed to perfume snuff. Andira surinamensis, inermis, racemosa, £c., tropical American trees, contain narcotic-acrid principles, which are emetic, purgative, narcotic and vermifuge. Geoffroya vermifuya and spinulosa, Brazilian trees, of which the seeds possess an acrid and volatile principle, and are used as anthelminthics. DaJbergia latifolia [and other species], of Brazil, India, and Africa, afford Rosewood, as do many species of Mach, p. 402. LXXVII. SAXIFBAGE.E. 393 merous. Stamens 4 or 8, alternating with scales. Ovary 4- (rarely 2-) celled. (Intermediate between SAXIFRAGEJE and CRASSTJLACE.S.) Francoa, Tetilla. TRIBE III. HYDRANGEA. — Shrubs or trees. Leaves opposite, simple, exstipulate. Petals often valvate. Stamens usually epigynous. Ovary usually 3-5-celled. Hydrangea, Dichroa, Deutzia,1 Decumaria,1 PMladelphus,1 Jamesia, Fendlera, &c. Escallonia. Diagram. Escallonia. Flower cut vertically (mag.). Escallonia rubra. E. rubra. Transverse section of ovary (mag.). E. macrantha. Transverse section of ovary (mag.)- Escallonia. Seed, entire and cut vertically (mag.). TRIBE IV. ESCALLONIE.J;.: — Trees or shrubs. Leaves alternate, simple, exstipulate, often coriaceous, and gland-serrate. Stamens usually as many as the petals. Escallonia, Quintinia, Breoeiaf Carpodetus, Itea, Polyosma, Anopterus, Argophyllum, &c. TRIBE V. CUNONIEJE. — Trees or shrubs. Leaves opposite, rarely whorled, simple or com- pound, stipulate. Petals never valvate. Codia, Callicoma, "Spirceantliemwm, Ceratopetalum, AcropJiyllum, AcJcama, Weinmannia, Cunonia, &c. TRIBE VI. RIBESIE^:. (See order RIBESIACE^, p. 398). — Shrubs. Leaves alternate, simple ; stipules 0, or adnate to the petiole. Flowers usually racemose. Ovary 1-celled, 2-carpellary. Seeds immersed in pulp ; raphe free. Ribes. ANOMALOUS GENERA. Bauera, CepJialotus,3 — J)D.] 1 See order Pkiladclphc, and especially the Poplars, in inflorescence, diclinous achlamydeous and polyandrous flowers, many-ovuled ovary, capsular fruit, woody stem, and stipulate leaves ; but Salicinece are dioecious, the ovary is one-celled, with parietal placentation, the ovules anatropous, and the funicle hairy. But four species are at present known of Liquidambar: — L. Altingia, a gigantic tree, forms vast forests in Java, Asia, New Guinea, &c., under the names of Rosa-maUos, liassa-mala, &c. L. orientals, a small tree resembling a Maple, inhabits the isle of Cyprus and Asia Minor. L. macrophylla and styraciflua grow in North America [another is Chinese]. L. styraci/lua yields [the North American] Liquidambar Balsam, obtained by incisions in the trunk. This balsam contains a tolerable quantity of benzoic acid ; it is of the consistence of a thick oil or of soft pitch. Liquid styrax, a sweet balsam, much used by the Orientals as a perfume, and entering into the composition of several medicaments, is the produce of L. Altingia and perhaps also L, orientate. [The bark of all is a hot, bitter stomachic.] LXXXVIII. BKTJNIACE^E. 413 LXXXVIII. BRUNIACEJE. B. pinifolia. Flower (mag.). B. pinifolia. Flower cut vertically (mag.). B. pinifolia. Fruit cut vertically (mag.)« Brvnia nodijtora. Brunia. Diagram. B. nodiftora. Transverse section of fruit (mag.). liruniu. Seed cut vertically (mag.). SHRUBS or UNDERSHRUBS from the Cape of Good Hope, Heath-like in habit. LEAVES small, acerose, sub-trigonous, entire, usually imbricated in 5 rows, exstipu- late. FLOWERS ? , small, regular, generally in a spike or head, sessile, 5-bracteate. CALYX 5-4-partite, persistent or deciduous, imbricate in bud. EECEPTACULAR CUP enveloping the ovary, very rarely spread into anepigynous disk (Thamnea). PETALS 5-4, inserted on the edge of the cup, alternate with the calyx-lobes, usually free, sometimes connate with the stamens into a tube at the base, imbricate in bud. STAMENS inserted with the petals, equal in number and alternate with them ; fila- ments free, or sometimes adnate to the claws of the petals ; anthers introrse, 2-celled, cells opposite, parallel or diverging at their base, and opening longitudinally. OVARY semi- inferior or inferior, very rarely free (Raspailia), 1-2-3-celled ; styles 2-3, terminal, more or less cohering ; stigmas minute, papillose ; ovules anatropous, solitary or 2, collateral in the cells of the 2-3-celled ovary, and pendulous from the central angle or near the top of the septum, solitary in the 1 -celled ovaries (in Thamnea the ovary is 1 -celled, with 10 pendulous 1 -seriate ovules). FRUIT crowned by the calyx, and sometimes by the persistent corolla and androecium, dry, indehis- cent or capsular, often with two 1-2- seeded cocci, dehiscence internal, longitudinal. 414 LXXXIX. HALORAGE^J. SEEDS inverted, testa crustaceous, hilum naked, or covered with a fleshy cnpule. EMBRYO minute, straight, at the top of a copious fleshy albumen ; cotyledons short ; radicle conical, superior. PRINCIPAL GENERA. Berzelia. *Brunia. Raspailia. Berardia. Staavia. Linconia. Brvniaccee approach Hamamelidecc, Cornea, Araliacea, and Umbelliferee, in the polypetalous and isostemonous corolla, epigny, solitary or geminate pendulous anatropous ovules, and albuminous embryo ; but in all these families, independently of other differences, the aestivation of the petals is [usually] valvate. Bnmiaceee have besides, in the genus Raspailia, a quite exceptional character in their ovary, superior to the calyx, and inferior to the petals. [The properties of Brwiiacea are quite unknown.] LXXXIX. IIALORAGEJE. (ONAGRARUM genera, Jussieu. — HALORAGE^E, Br. — CERCODIACE^E, Jussieu. — HYGROBLS, Richard.) CALYX superior. PETALS inserted on the calyx [or epigynous] alternately with its lobes, sometimes 0. STAMENS inserted with the petals, equal or double in number to the calyx-lobes, sometimes reduced to one. OVARY inferior, of one or several I-ovuled cells ; OVULES pendulous. EMBRYO straight, in the axis of a fleshy albumen. Aquatic HERBS, or terrestrial [HERBS or] UNDERSHRUBS. LEAVES usually opposite or whorled (Myriophyllum, Hippuris), simple, entire or toothed, the submerged usually pectinate, rarely entire (Myriophyllum) ; stipules 0. FLOWERS 3 (Haloragis, Hippuris}, or monoecious through arrest (Myriophyllum, Hippuris), regular, incon- spicuous, sessile in the axil of the leaves, solitary or fascicled, often 2-bracteolate at the base, sometimes whorled in a spike, rarely pedicelled, sometimes panicled [or racemed]. CALYX superior, usually 4-fid or -partite, sometimes truncate or almost wanting. COROLLA 0, or petals inserted on the calyx, alternate with its segments, usually longer, sub-concave, valvate or imbricate in aestivation, spreading after flowering, and deciduous. STAMENS inserted with the petals, usually equal and opposite to the calyx-lobes, or double in number, sometimes reduced to one (Hippuris) ; fllaments filiform ; anthers introrse [or dehiscence lateral], 2 -celled, oblong or ovoid, basifixed (Myriophyllum, Haloragis) or dorsifixed (Hippuris), dehiscence longitudinal. OVARY inferior, of 2-3-4 1-ovuled cells, rarely 1 -celled (Hippuris) ; styles as many as ovules, often short or nearly 0 ; stigmas tomentose or penicillate ; ovules pendulous from the top of the cell, anatropous. FRUIT nutlike, often crowned by the calyx- limb, 2-3-4-celled, or 1-celled normally or by arrest. SEEDS inverted, testa mem- branous. EMBRYO straight, in the axis of a more or less fleshy albumen ; cotyledons short, obtuse ; radicle longe.r, next the hilum, superior. PRINCIPAL GENERA.' Hippuris. Myriophyllum. Haloragis. Serpicula. Proserpinaca. Meionectes. 1 The two anomalous genera, Gunncra and Callitriche, Hooker fil., are treated as distinct natural orders in which have been included in this order by Bentham and this work. — ED. LXXXIX. HALORAGE^E. 415 IJaloragis. Q flower (mag.). Halorayis. 9 flower cut vertically (mag.). Halorayis erecta. Hippuris. Diagram. Hippuris vulgaris. Haloragis. flower (mag.). Haloragif. Ovule (mag.). Hippuris. Pistil (mag.). I & ° ^ ] \ o ®) n ^ 0 Haloragis. Diagram. Hippunt, Sf^men, inner face (mag.). Hippuris. 9 flower (mag.). ITippurit. Fruit (mag.). Hippuris. Vertical section of g flower (mag.). Hippnrif. Vertical section of fruit (mag.). XC. GUNNERACE^E. The affinities of Haloragece with Onagrariea will be indicated in the description of the latter.1 They are near Trapea, which were formerly placed in the same family, and which only differ in their hemi- spherical stigma and exalbuminous embryo. They also approach Combrctacece, which are separated by their ovary (which is always 1-celled and 2-4-6-ovuled), their simple style, drupaceous fruit, and exalbu- minous embryo. Haloragetz are rare in the tropics ; they are found most abundantly in temperate and cold countries (Hippuris), especially beyond the tropic of Capricorn ; Haloragis is only found in Australia and the neighbouring islands. They are of no use to man. XC. GUNNERACE^E? Endlicher. scabra uu.'iiicrit scavra. Gtinnera. Fruit cut vertically (mag.). 1 Tfie affinity between Halorayecc and Onayrark is view of the relations of Trapa.— ED. remcly slight, and was based chiefly on an erroneous * See under Haloragca, p. 414. — ED/ XCI. CALLITRICHINE^E. 417 STEM herbaceous. LEAVES all radical, petiole long, blade usually reniform, crenulate, hairy. FLOWERS $ , or imperfect, monoecious or dioecious, ebracteate ; scape bearing a very close spike, composed of several spikelets, each furnished with a bract. PERIANTH 4-partite, 2 segments small, tooth-shaped, alternating with 2 larger, petaloid, caducous, sometimes obsolete, reduced to scales in the $ flowers. [Perianth otherwise described as, CALYX-LOBES 2-3, equal or unequal, or 0. PETALS 0 or 2, hooded.] STAMENS 2, opposite to the petaloid segments ; filaments short [or long] ; anthers 2- celled, [basifixed], dehiscence longitudinal [lateral]. OVARY in- ferior, 1 -celled ; styles 2, covered with stigmatic papilla) ; ovule solitary, pendulous from the top of the cell. FRUIT a drupe. EMBRYO minute, at the top of a fleshy albumen ; radicle superior. GENUS. * Gunnera. A. de Jussieu considered that, in many cases, apetalous and diclinous structures were to be regarded as arrested conditions of perfect types, which masked affinities without annulling them; and this explains the position he gives to Gunneracece, between Araliacece and Cornea, which they approach in their flower, which is hermaphrodite in some species, in their epigyny, the single pendulous anatropous ovule in each carpel, the drupaceous fxuit, and the minute embryo at the top of a fleshy albumen. The same considerations establish the affinity of Gunneracete with Haloragcce ; in both these families may be observed, on the one hand, a perfect organization ; on the other, the absence of petals, and the abortion of the reproductive organs ; and the analogy is increased by the stigmatic papillae along the styles. The few species of this little group inhabit tropical Southern Africa and America, the high mountains of tropical America, the Sandwich and Society Islands, Java, [Australia] and New Zealand. The fruit of Gunnera • macrophy lla is used in Java as a stimulant. The roots of G. scabra, called Panque in Chili, and cultivated in Europe for the beauty of its leaves, which are sometimes more than six feet in diameter, contain astringent principles, and are used in Chili for tanning skins, and as an anti-dvsenteric. XCI. CALLITRICIUNE^, LtveilU.1 Floating flaccid annual HERBS, simple or branched, stem cylindric. LEAVES opposite, sessile, the lower [submerged], often linear, the upper oval, 1-3-nerved, entire, emerged, often rosulate ; stipules 0. FLOWERS $ or monoecious-dioecious by arrest, solitary and sessile in the axil of the leaves ; involucre diphyllous [or 0] , of 2 lateral opposite curved somewhat fleshy and coloured [white] persistent or deciduous leaflets. PERIANTH 0. STAMEN posterior, rarely 2 antero-posterior, inserted below the ovary in the $ flowers ; filament filiform, elongated ; anther reniform, basifixed, 1-celled, opening at the top by an arched slit. OVARY free, at first sessile, then stipitate, formed of 2 bilobed carpels with two 2-ovuled cells ; 2 styles 2, distant ; stigmas acute, papillose over the whole surface ; ovules curved, fixed to the central angle near the top of the cell ; micropyle lateral and internal, placed 1 See under Haloragea, p. 414. — ED. cells, but considered as originally 2-celled, each cell being 2 The ovary is 4-lcbed and 4-celled with 1-ovuled divided into two by the inflection of its -walls. — ED. E E 418 XCII. EHIZOPHORE^J. below the top. FRUIT fleshy-membranous, indehiscent, 4-celled and -lobed, side^ rounded or sharp. SEEDS with a finely membranous testa EMBRYO a little arched, Callilrifhe. 9 flower (mng.). Callilriche rema. Callilriche. flower, diagram. Callilrirhe. ) composed of the genera Olinia, Myrrhinium, and Fmdia, is placed between Myrtacea and Melastomacece. The berries of Myrrhinium atropurjmreum, [a Brazilian shrub,] are edible. XCIX. GRANATE^E,1 Endlicher. Pomegranate. Vertical section of flower. Pomegranate. Diagram. Pomegranate (Punica Granatum). Pomegranate. Sued entire and cut vertically (mag.). Pomegranate. Transverse section of upper chamber of fruit. Pomegranate. Transverse section of lower chamber of fruit. Pomegranate. Stamens. Pomegranate. Seed cut transversely (mag.). STEM woody, branches sometimes spinescent. LEAVES generally opposite, often fascicled, entire, not punctate, glabrous, exstipulate. FLOWERS 5 ? terminal, soli- tary or aggregate. CALYX coloured ; limb many-partite, many-seriate, valvate in bud. PETALS 5-7, inserted on the calyx-throat, alternate with the sepals, imbricate in bud. STAMENS numerous, many-seriate, inserted below the petals, and included ; filaments filiform, free; anthers introrse, 2-celled, ovoid, dorsifixed, dehiscence 1 See end of 'Lythrariev, p. 433. — ED. FP 2 436 C. ONAGRAEIE^. longitudinal. OVARY adhering to the receptacular cup (calyx-tube), forming 2 superimposed rows, the lower 3-celled with central placentation, the upper 5-7-celled with parietal placentation ; style filiform, simple ; stigma capitate ; ovules numerous, anatropous. BERRY spherical, crowned by the calyx-limb, cells separated by membranous septa. SEEDS numerous, integument full of an acid pellucid pulp. EMBRYO exalbuminous, straight ; cotyledons foliaceous, convolute ; radide oblong, short, pointed. ONLY GENUS. Punica. The fruit of the Pomegranate is probably monstrous, and analogous to certain fruits singularly modified by cultivation, as the Tomato (Lycopersicum esctdcntum), and that variety of Orange called ' Bizarrerie ' or ' Mellarose.' [The Pomegranate is indigenous in Upper India, where its fruit altogether resembles that of the cultivated state. — ED.] The genus Punica is very near Myrtacete (see that family). The single species of which it is com- posed (P. Granatuni) is a native of Mauritania,1 whence its name of Punica, It grows all along the shores of the Mediterranean, and extends thence throughout the temperate regions of the world; its fruit (Pomegranate) is covered with a coriaceous bark, called ' malicor,' very rich in tannin, and used by curriers ; its pulpy seeds are refreshing. Its flowers, called Balau*tium, were formerly administered as a vermifuge ; but its anthelminthic properties principally exist in the bark of its root. This bark contains an astringent substance, with a mild and an acrid principle, which latter destroys tapeworm. C. ONAGRARIEsE. (EPILOBIACE^E, Ventenat. — ONAGRACE^E, Lindl. — ONAGRE^:, Spach. — Endl.) COROLLA polypetalous, epigynous, contorted in bud. ST/AMENS inserted with the petals, equal or double them in number, rarely fewer. OVARY inferior, many-celled, many- (rarely few-} ovuled. EMBRYO exalbuminous. Terrestrial or aquatic HERBS, or SHRUBS. LEAVES opposite or alternate, simple, penninerved, entire or toothed, exstipulate. FLOWERS $, usually regular, often fugacious, axillary and solitary, or racemed or spiked. CALYX herbaceous or coloured; limb 4- (rarely 3-2-) partite, persistent or deciduous, valvate in bud. PETALS (very rarely 0) inserted on the top of the calyx-throat, on an epigynous, flat or annular glandular disk, alternate with the calyx-segments, more or less distinctly clawed, sometimes emargiuate or bifid, contorted in bud. STAMENS inserted with the petals, either equal in number and alternate, or double and 1-2- seriate, rarely fewer ; filaments filiform or subulate, free ; anthers 2-celled, introrse, dehiscence longitudinal ; pollen of trigonous granules, often cohering by threads. OVARY inferior, often crowned by the glandular edge of the disk, usually 4- (rarely 2-) celled; style filiform; stigmas as many as cells, linear, papillose on their inner 1 A. de Candollo (' Geographic Botanique,' ii. 891) Africa only in a cultivated state. It ranges in a -wild riglitly-points out that the Pomegranate exists in North state from Asia Minor to the Punjab Himalaya. — ED. C. 437 Epilobium hirsutum. Epilobium. Epilolium. Pistil (mag.). Vertical section of flower »mag.). Epilobium, Diagram. Epilobium. Epilobium. Seed cut vertically (mag.). Ripe seed, furnished with a chalazisn tuft. Isnardia palustris. Epilobium. Young seed (mag.). Epi^bium. Fruit'. 438 0. Clrccfa. Vertical si-ction of flower (mnjr.). Circaa lutttiana. Circaea. Tlower without its corolla (mag.). Jussieita ovali/olia. Circaa. Transverse section of fruit (mag.). Cirecea. Vertical section of fruit (mag.). surface, rarely coherent ; ovules numerous in the cells, inserted at the inner angle, rarely few, ascending or pendulous, anatropous. FRUIT generally a capsule, some- times a berry (Fuchsia), rarely nut-like (Gaura) ; capsule 4-2-celled, sometimes 1- celled by obliteration of the septa, loculicidal ((Enothera), or septicidal (Jussieua, Isnardia), with semi-septiferous valves, or having the seeds on a free columella. SEEDS numerous, rarely few or solitary, ascending or pendulous ; testa crustaceous or membranous, sometimes winged (Montinia), sometimes fringed (Godetia, Clarkia), CI. TRAPEZE. 439 or hairy at, the chalaza (Epilobium). EMBRYO exalbumi nous, straight ; cotyledons foliaceous or a little fleshy, often auricled at the base; radicle conical, cylindric, near the hiluin, superior or inferior, rarely centripetal. PRINCIPAL GENERA. * Epilobium. * Jussieun. Ludwigia. * Clarkia. * CEnothera. * Fuchsia. * Lopezia. * Godetia. * Eucharidiuni. Isnardia. * Zauscbneria. Circsea. * Gaura. [Trapa.1] ANOMALOUS GENUS. Montinia. Onagrariece are connected with Saloragees, Trapece and Combrctaceee by the valvate calyx, the iso- or diplo-stemonous corolla and the inferior ovary ; but Bahrageee differ in their albuminous embryo, Trapece in the imbricate aestivation of their corolla, and Combrctacece in their 1-celled ovary. Lythrariea: have some affinity with Onagrariea ; in both families the calyx is valvate, the corolla iso- or diplo-stemonous, the ovarian cells many- ovuled, the style simple, the fruit a capsule, and the embryo straight and exalbuminous ; but Lythrariece have a free ovary and imbricate petals. Onagrariecc are widely diffused ; but chiefly in the extra-tropical temperate regions of the northern hemisphere, and especially of the New World. Fuchsia extends from Mexico to the Straits of Magellan and New Zealand. Many Epilobia are found in the southern hemisphere [they are characteristic of the herba- ceous vegetation of New Zealand]. Onagrariete contain mucous and sometimes slightly astringent principles, and for this reason Circ&a lutetiana and the narrow-leaved Epilobia are used in some countries, especially externally ; in Sweden they eat the young shoots of the latter, Several (Euotheras, and especially (Z£ biennis, have a sweet and edible root. Fuchsia excorticata has poisonous berries [?]. [Those of other species are sweet and edible. Montinia, a Cape genus, is said to be acrid.— ED.] CI. TRAPE^ Endlicher. Lacustrine floating HERBS. LEAVES, some submerged, others emerged : the submerged opposite, pinnatisect (like rootlets), the upper alternate; the emerged in a rosette, petioled, rhomboid ; petiole vesicular during flowering, exstipulate. FLOWERS axillary, solitary, shortly peduncled. CALYX 4-partite, valvate in bud, with spiny lobes. PETALS 4, inserted on an annular fleshy sinuous disk, crowning the top of the ovary, alternate with the calyx-segments, imbricate in bud, edges folded. STAMENS 4, inserted with the petals, the alternate shorter; filaments filiform-subulate ; anthers introrse, 2-celled, dorsiflxed, dehiscence longitudinal. OVARY semi- inferior, of two 1-ovuled cells ; style cylindric, simple ; stigma flattened, obtuse X, ovules pendulous from the top of the septum, anatropous, raphe dorsal. FRUIT coriaceous [or woody], indehiscent, crowned by the spmescent calyx-limb, which resembles 2-4 horns, capped by the hardened disk, 1-celled and 1-seeded from arrest. SEED inverted; testa membranous, adherent, the upper part spongy. EMBRYO exalbuminous, straight ; cotyledons very unequal, one very large, thick, and farinaceous, the other minute, squamiform, inserted a little lower ; radicle slightly 1 See order Trapeee, p. 439.— E». « See also under Onagrarieee, p. 439.— ED. 440 CI. TKAPE^E. Trapa. Iiitrorse stamen, ventral and dorsal face (mag.). Ti apa natans, with its fruit. Oil. SAMYDACE^E. 441 Trapa. Young fruit (mag.). Trapa. Ripe fruit (mag.). Trapa. Petal (mag.). bent, superior, piercing the top of the fruit in germination ; plumule very small, concealed within the small cotyledon. ONLY GENUS. Trapa. Trapece are closely related to Halorayece (see this family). T. natuns, the Water Chestnut or Calthrop, inhabits stagnant water in Central and Southern Europe. Its seeds aft'ord a farinaceous food, as do those of the Kashmirian T. bispinosa, and the Chinese T. bicomis, called by the natives Ling or Ki-chi. CIL (HOMALINEJS, EndL) [TREES or SHRUBS, glabrous, or pubescent or touientose. LEAVES petioled, simple, alternate, distichous, quite entire or serrate, teeth sometimes gland-tipped ; stipules email, usually deciduous or 0. FLOWERS £ , regular, inconspicuous^ raceined, fascicled or panicled, pedicels articulated and 2-bracteolate. CALYX coriaceous, per- sistent, tube usually free ; lobes 3-7, imbricate or valvate. PETALS as many as the calyx- lobes, and like them, rarely more or 0, perigynous, imbricate in bud. DISK cupular, annular or glandular. STAMENS definite or indefinite, l-oo -seriate, usually alternating with staminodes, equidistant or collected in fascicles ; filaments filiform or capillary, free or connate ; anthers didymous or oblong, introrse or extrorse, dehiscence longitudinal. OVARY free, rarely adnate to the calyx-tube, sessile, 1- celled ; style long or short, rarely 3 ; stigma entire or 3-fid ; ovules few or many, inserted on 3-5 parietal placentas, sometimes confined to the upper part of the cell, pendulous or ascending, anatropous, raphe lateral or ventral. FRUIT indehiscent or capsular, 1 -celled, l-oo -seeded, 3-5-valved at the top or throughout its length, valves alternating with the placentas. SEEDS usually few by arrest, oblong or angled, ascending or pendulous, outer coat thin and fleshy or a torn aril ; testa crustaceous or coriaceous, striate or rugose ; albumen copious, fleshy. EMBRYO axile ; cotyledons oblong or orbicular or cordate, often foliaceous ; radicle short or long. 1 This order is merely alluded to in the original regarded as a tribe, connecting Bixineie with Patsi- •R-ork at the end of Bixinces (p. 247), to which it is floreee. — ED. most closely allied, and of which it is perhaps best 442 CHI. LOASE^E. TRIBE I. CASEARIEJE. — Leaves alternate. Calyx free, 4-5-merous. Petals 0. Stamens 6-30, inserted in one series within the calyx-tube, usually alternating with as many staminodes. Casearia, lAinaria, Samyda, &c. TRIBE II. BANAREJ:. — Leaves alternate. Calyx free, 4-5-merous. Petals 4—5, or more. Stamens many, inserted in many series on a perigynous disk. Banara, KuJilia, &c. TRIBE III. ABATIE.E. — Leaves opposite, sub-opposite, or whorled. Calyx 4-partite, valvate. Petals 0. Stamens 8 or indefinite, 1- or many-seriate, staminodes 0. Abatla, Ralcii/liia, Aplicerema. TRIBE IV. HOMALIEJE. — Leaves alternate, rarely sub-opposite or whorled. Calyx free or adnate to the ovary, 4— 15-merous. Petals 4—15. Stamens as many as and opposite to the petals, or if more, in bundles opposite to the petals, and alternating with glands. HomaUum, Byrsanthus, &c. A small order intermediate between Passi/lorefr and Sirinea-, differing from the former in habit and the want of a corona, and from the latter in perigynism : it is also near Vwlarie.a; and Canellacecc. The species are few, wholly tropical, and found in both the Eastern and Western hemispheres. The general properties of the order are astringent, but none are of any known value ; some are bitter, others mucilaginous, and others again are said to be acrid. — ED.] [For illustrations, see p. 247.] GUI. LOASEJZ, (LOASEjE, JuSSieU. — LOASE^E VER.E, Kunth. — LOASACE^G, Linll.) COROLLA polypetalous, epigynous, anisostemonous, valvate or imbricate in bud. STAMENS more numerous than the petal*, rarely all fertile, the outer usually fertile and united in bundles, the inner sterile. OVARY inferior, l-celled, placentation parietal. OVULES pendulous, anatropous. FRUIT a capsule. EMBRYO albuminous. RADICLE superior. Erect or climbing HERBS, often dichotomous, usually covered with stiff often hooked stinging bristles. LEAVES opposite or alternate, simple, usually palmilobed, exstipulate. FLOWERS 3 , regular, solitary or aggregated, on 2-bracteolate pedun- cles, axillary or terminal, or leaf-opposed from the elongation of the axillary branch. CALYX superior, 4-5-partite, lobes usually 3-nerved, imbricate or valvate in bud, PETALS deciduous, inserted on the calyx, rarely equal to its lobes in number, and alternate with them, often double in number, of which the 4-5 outer are alternate with these same lobes, and induplicate-valvate or imbricate in bud, and as many inner opposite to the calyx-lobes, smaller than the outer, sometimes antheriferous, generally squamiform, dorsally naked, or awned below the top. STAMENS inserted with the petals, double in number or indefinite, rarely all fertile ; the outer usually fertile, various in number, grouped in bundles before the largest petals, the inner sterile, differently shaped, in groups of fours, opposite to the smallest petals ; fila- ments filiform or subulate, free or united in bundles ; anthers introrse, 2-celled, dorsifixed, dehiscence longitudinal. OVARY inferior, l-celled, with 3-5-4 parietal CIIL LOASEJ3. '443 Cajo/>ltora. Transverse section of ovary (mag.). Cqjophora. Seed, entire and cut vertically (mag.). Mentielia. Loasa. Seed, entire and cut vertically Inner petal (mag.). (mag.). Mentzelia. MentzeUa. Fruit (inag.). Part of ovary cut vertically (mag.). Mentztlia. nsverse section of ovary (mag.). 444 CIII. LOASE^E. placentas ; style simple, filiform or trigonous ; stigma undivided or 3-4- fid ; ovules usually numer- ous, pendulous, anatropous. CAPSULE contorted or cylindric, tunicate by the receptacular cupule (often foliiferous), which some- times only adheres by its nerves, and crowned by the calyx, rarely flesh/ and indehiscent, usually opening at the top, or throughout its length by 3-5 valves alternating with the placentas, which adhere to it, or finally separate, and represent alternate valves narrower than the true ones, and semi-semi- niferous. SEEDS usually numerous, pendulous, funicles short ; testa loose, reticulate ; endopleura membranous. EMBEYO straight, in the axis of a fleshy albumen, and nearly equalling it in length ; cotyledons flat, small ; radicle cylindric, longer than the cotyledons, superior. PRINCIPAL GENERA. * Mentzelia. * Bartonia. * Loaaa. Cajophora. [Gronovia]. Loasea approach Passiflorete (see this family). Like Cucurbitactte, they are generally climbers, with palmilobed leaves ; their ovary is inferior and one-celled, with parietal placentation ; the ovules are numerous and anatropous ; but Cttcurintaccee have definite stamens, extrorse and usually syngenesioua anthers, diclinous .flowers, tendrils, an exalbuminous embryo and corolla, imbricate in bud. The same affinity exists between Loasea and Gronovieee,1 which again are separated by their pentandrous andrwcium [Cevallta and other Loasete are pentandrous], the fleshy ring crowning the ovary, their dry fruit, which is a nucule, and their exalbumiuous seed. Lonsece have also an affinity with Turneracece, in the con- torted aestivation, one-celled ovary, parietal placentation, numerous anatropous ovules, capsular fruit, and straight albuminous axile embryo ; but in Turneracete the ovary is free, the stamens definite, the valves of the capsule are semi-placentiferous, and the stem is erect. Loasea are all American, except the genus Fissenia, which is African. Most of them grow on the slopes of the Cordilleras facing the Pacific Ocean, beyond the equator, but not in cold regions. The species are little used, excepting Mentzelia hispida, which is a strong purgative, and employed by the Mexicans in syphilitic affections. Bartonia aurea. 1 Gronoviea, alluded to in this work under Cucurbitacea, consists of one genus, which undoubtedly belongs to Loasece, with the habit of Cucurbitacea.— ED. CIV. TUKNEBACE^E. 445 CIV. TURNERACE^E. (LoASEARUM sectio, Kunth. — TURNERACE^E, D.C.) Turnera. Flower (mag,). COROLLA polypetalous, perigynous, isostemonous, contorted Stamen (mag.). Turnera. Pistil (mag.). in bud. STAMENS 5, sub-hypogynous. OVABT free, l-celled, with 3 parietal placentas. CAPSULE with 3 semi-seminiferous valves. SEEDS strophiolate. EMBRYO albuminous. HERBS, or UNDERSHRUBS, or SHRUBS, chiefly of tropical America, with simple rarely stellate hairs. LEAVES alternate, simple, petioled, entire or toothed, rarely pinnatifid, exstipu- late, but often furnished at the base with .2 lateral glands. FLOWERS 5 , regular, axillary, sessile or peduncled ; peduncle free or aduate to the petiole, simple, 2-bracteolate, or jointed below the middle and ebracteate, very rarely branch- ing and many-flowered. CALYX coloured, deciduous, 5-fid, imbricate in bud. PETALS 5, inserted near the base or in the threat of the calyx, alternate with its Turnera. Seed, entire and cut vertically (mag.). 446 CV. PASSIFLORE^E. lobes, shortly clawed, equal, contorted in bud, deciduous. STAMENS 5, inserted at the bottom of the calyx-tube and opposite to its lobes; filaments free, piano- subulate; anthers introrse, 2-celled, erect, dehiscence longitudinal. OVARY free, 1-celled, with 3 nerviform placentas alternating with the sutures of the carpels ; styles 3, terminal, opposite to the placentas ; stigmas 3 or 6, fan-shaped ; ovules numerous, ascending, anatropous. CAPSULE with 3 semi-placentiferous valves. SEEDS numerous, 2-seriate, ascending, cylindric, curved ; testa crustaceous ; hilum basilar ; raphe filiform ; chalaza projecting ; strophiolus membranous, appressed to the base of the seed on the side of the raphe. EMBRYO straight, in the axis of a fleshy albumen ; cotyledons sub-elliptic, plano-convex ; radicle reaching to the hilum, inferior. GENERA. * Turners. Erblichia. Wormskioldia. This small family is near Loasefri>ia. Transverse section of orary (mag.). Ovule (mag.). One sepal ami two petals (ma?.). Andrcecium and pistil. spreading ; stigmas clavate or peltate, some- times sub-2-lobed ; ovules numerous, ana- tropous, 1-2-seriate, attached to 3—5 parietal linear placentas by longer or shorter funicles, enlarged into a cupule at the umbilicus.. FRTIT 1-celled, an indehiscent berry, or a rai'sule with 3-5 semi-placentiferous valves. SEEDS numerous ; funicle dilated into a pulpy cupuliform or saccate aril ; testa crustaceous, foveolate, easily separable from the membranous endopleura, which bears a longitudinal raphe. EMBRYO straight, occupying the axis of a fleshy dotted albumen ; cotyledons foliaceous, flat ; radicle cylindric, near the hilum, centrifugal. [The following is the classification of Pcufiflorea* made for the ' Genera Plan- tarum * :— TRIBE I. MALESHERBIKJ:. — Flowers 5 . Calyx-tube elongate, lobes triangular-subulate. Corona and corolla membranous. Stamens 5, adnate to the gynophore. ' Styles 3, remote at the base. Seeds oblong. (South America.) Malegherbia, Gynopleura. TRIBE II. PASSIFLOREJE. — Flowers $ • Corona simple or double. Petals herbaceous. Styles 1 or 3-5, connate at the base. Seeds flattish. *Pa«»lflora, *Tacsonia, Paropsia, Smeathmannia, &c. TRIBE III. MODECCEJE. — Flowers $ > °r if unisexual perianths of the sexes alike. Corona small or 0. Petals usually included in the calyx-tube. Connective of the anthers usually produced. (Old World.) *llodecca, Ophiocaulm, Machadoa. TRIBE IV. ASCHARIE £. — Flowers unisexual, perianth of the sexes alike. Calyx very short. Corolla campanulate, 3-5-fid. Stamens inserted on the throat or base of the corolla. (South Africa.) Ceratosicyos, A*charia. TRIBE V. PAPAYACF..*:.1 — Flowers unisexual, or $ and unisexual in the same inflorescence, perianths of the sexes dissimilar. Corona 0. Stamens 2-seriate, inserted on the corolla-tube. Can'co, Jacaratla."] 1 See end of Cuturbitaceir, p. 452. — ED. CVI. CUCUEBITACE^l. 449 A. L. de Jussieu placed Passiflorece in the family of Cuwirbitacece, -which they approach in their climbing stem furnished with tendrils, their alternate palminerved leaves, double perianth, and one-celled ovary with parietal placentatiou ; in addition to which some genera are diclinous (Modecca) j but in Cucurbitacea the ovary is inferior, the anthers are extrorse, usually reduced to three, and syngenesioua, the embryo is exalbuminous, the leaves exstipulate, and the tendrils are leaves arising from a branch joined to the stem, arrested near the point of departure, and merged in the petiole of the leaf which it bears. Some Loasea have, like Passiflorea, a climbing stem, palminerved leaves, a one-celled ovary with parietal placentation, numerous pendulous and ariatropous ovules, the fruit a capsule or berry, and a straight axile albuminous embryo ; but they want stipules and tendrils, and the placentas occupy the interspaces and not the middle of the valves of the fruit. Passiflorea have an affinity with Homalinece,1 founded on the 2-seriate perianth, the 1-celled ovary, parietal placentation, styles equalling the placentas in number, the berry or capsule, albuminous seed, and the alternate stipulate leaves ; but in Homalinece the ovary is usually inferior, and the stamens inserted high up the calyx-tube ; Papayacece also approach Passiflorece in their palminerved leaves, their free usually 1-celled ovary with parietal placentation, their fleshy fruit, and their arillate seeds ; but they are separated by being diclinous [Tribes Modeccece and Achariece are both diclinous], by the insertion of the stamens, the radiating sub-sessile stigma, &c. Pamflorece mostly inhabit the tropical regions of the New World ; they are much rarer in Asia, Australia, and tropical Africa, where we find Smeathmannia, a shrub without tendrils. The pulpy aril of Passiflorece and Tacsonia is used in America in the preparation of cooling drinks. The flowers and fruits of Passiflora rubra [called Dutchman's Laudanum] are prescribed in the Antilles for their narcotic properties. P. quadrangularis (the Grenadilla) is valued, like the allied species, for the refreshing pulp of its seeds, but its root is very poisonous ; if administered in a small dose it is a vermifuge, like many of the other species. [The Papaw is the insipid berry of Carica, the juice of whose fruit is a powerful vermifuge and anti- septic, and contains fibrine, a substance otherwise supposed to be peculiar to the Animal Kingdom. The whole tree has the singular property of rendering tough meat tender by separating the muscular fibres ; its roots smell like decaying radishes, and its leaves are used as a soap by negros. The juice of the Brazilian C. digitata is a deadly poison. — ED.] CVI. CUCURBITACEJ3, Jussieu. FLOWERS monoecious, dioecious, or polygamous. COROLLA 5-merous, imbricate. STAMENS 5-3, of which one is usually 1-celled. OVARY inferior, l-several-celled, 1- many-ovuled. FRUIT a berry. SEEDS exalbuminous. EMBRYO straight. — STEM fur- nished with tendrils. LEAVES alternate. Annual or perennial HERBS or UNDERSHRTJBS with fibrous or often tuberous roots. STEM cylindric or angular, climbing, juice watery. LEAVES alternate, petioled, palminerved, often palmilobed, usually cordate ; tendrils simple or branching, springing singly in the same plane with the leaves. FLOWERS monoecious or dioecious, very rarely 5 , axillary, solitary fascicled racemed or panicled, white or yellow, rarely red. CALYX usually campanulate, limb 5-toothed or -lobed, imbricate in bud. COROLLA monopetalous, rotate or campanulate, 5-lobed, sometimes a little irregular (Thladiantha) , lobes entire or fringed, imbricate in bud, inserted on the calycinal limb, and alternate with its divisions, distinct, or more often coherent, and then adnate to the calyx, and as if continuous with its limb. ANDROSCIUM inserted at the bottom of the corolla, or of the calyx, composed of two 2-celled and 1 Samydacea, tribe Homalie'< T Tribe I. of Ficoidece, p. 461. Meiembi yanlliemnm. Seed, entire and cut vertically (mag.). CXI. MESEMBRYANTHEME^E. 463 Mesembryanthemum. Nearly ripe fruit (mag.). Afesembryanthemum. Ripe fruit (mag.). Mesembryanthemiim. Kipc fruit cut vertically (mag.). marcescent or deliquescent, imbricate in bud. STAMENS indefinite, many-seriate ; filaments subulate or setaceous, unequal, free or united at the base ; anthers introrse, 2-celled, ovoid, versatile, deliiscence longitudinal. CARPELS 4-20, cohering into an inferior ovary, 4-20-celled, ventral suture free, superior ; placentas linear, parietal, occupying the bottom of each cell ; stigmas 4-20, cristate, crowning the floral axis ; ovules numerous, several-seriate, fixed by a ventral hiluin to long funicles. CAPSULE at first fleshy, then woody and dry, top truncate, opening along the stig- matic crests by the centrifugal raising of the thick coriaceous epicarp as it separates from the endocarp, which persists under the form of geminate chartaceous triangular segments. SEEDS numerous ; testa crustaceous, soft or granular; albumen farinaceous. EMBRYO peripheric, dorsal, curved or hooked, voluminous ; cotyledons ovoid or oblong ; radicle cylindric. GENUS. * Mesembryanthemum. Mesembryanthemece approach Cactece in the polypetalous and epigynous corolla and its aestivation, in polyandry, parietal placentation and curved ovules ; they are separated by their many-celled ovary, sessile stigmas, farinaceous albumen, and normal leaves. They have also some affinity with Portttlacece, and especially with Tetragonia, in the more or less inferior ovary, polyandrous stamens, curved ovule, peri- pheric embryo, and farinaceous albumen ; but in Portulaca the placentation is central and free, and in Tetra- yonia, which has a pluricelled ovary, the ovules are inserted at the top of the central angle of the cells. Mesembryanthemeat inhabit South Africa. A small number of species are met with in the Mediter- ranean region, America and Australia. The fruits of some {M. edule) contain sugar, and are edible. The leaves of M. geniculiflomm are used as a vegetable by the people on the borders of the great African desert, and the bruised seeds yield them flour. M. crystaliinum (Ice-plant), naturalized in the Mediterranean region, is frequently cultivated on account of its singular appearance, its surface being covered with shining vesicles containing a gummy principle insoluble in water, and resembling in the sunlight a covering of hoar-frost. The inhabitants of the Canaries use the juice of many of these plants as a diuretic, and burn their leaves to obtain soda. The juice of M. acinaciforme is successfully employed at the Cape against dysentery. That of M. tortuosum is considered as a narcotic or sedative. [The leaves of M. mistrale, called Pig's Face, are eaten pickled in Australia. The seeds of the Shama are a most important article of food with the desert Arabs.] 464 CXII. TETEAGONIE^. CXII. TETRAGONIE^ Fenzl Telrayonia. Upper half of pistil (mag.). Tttragonia. Ovule (mag.). Vertical section of pistil (mag.). Titrayonia fruticota. Tetraijtniia. Seed cut vertically (mag.). Trlragonia. Embryo (mag.). Herbaceous, annual, or suffrutescent PLANTS, diffuse, succulent, glabrous or velvety. LEAVES alternate or sub-opposite, flat, fleshy, usually entire. FLOWERS g, regular, axillary or leaf-opposed, solitary or agglomerated, sometimes in a spike or raceme. CALYX superior, 3-5-lobed, fleshy, coloured within, induplicate-valvate in bud. COROLLA 0. STAMENS epigynous, l-5-oo , solitary, or aggregated between the calycinal lobes; filaments filiform-subulate; anthers 2-celled, didymous, cells oblong, separated at the base and top, opening longitudinally. OVARY inferior, 3-5- (sometimes 8-9-) celled, or 1-2-celled by arrest ; styles as many as the cells, short, stigmatiferous on their inner edge ; ovules solitary in each cell, pendulous by a short funicle from the top of the inner angle, semi-anatropous, micropyle superior, raphe dorsal. DRUPE or angular NUT crowned by the accrescent calyx, which is often dilated into horns or longitudinal wings ; crown of pericarp naked and marked with 1 See Tribe I. of Ficoidfse carpel, with thick wall, showing the minute 1-vittate ; commissnral embryo at the top of face 2-vittnte. the albumen (mag.). Carrot. (Daucus Carota.) .Klhuta Cynapiiim, Umbel and timbellules with involucre and Naked umbel ; umbellul involucols. with involucels. .M/ittsa. - Flower (mag.). Transverse section of fruit (mug.). Carpels with five raised and thickened sides : the lateral largest; furrows 1-vittate ; commissural face 2- vitiate. Flower cut vertically (mag.). Pratt. Bifid carpophore (mag.). Umbellule with :;-phylloiis iiivolucel. CXIIL UMBELLTFEEJS, ScandiJ: Peeten- Veneris, Umbel without involute ; umbellules with involucels. Scaodix. Fk) war (mag.)- Scandix /tcten- Veneris. Fruit. Undivided carpophore. Carpels with live primary sides, prolonged into a long be;ik. . Trattsverse section of carpel (mag.). Scandij;. Transverse section of a 5-sided carpel, with non-vittate furrows, and seed furrowed on its ventral face (mag.). Eryngium planum. Capitulum. Coriander. Pistil and calyx with unequal limb. Erynyium. Stamen inflected in aestivation (mag.). CoJ-iander. Flower, with outer petals largest. Coriander. Fruit (mag.). Hemispherical carpels with five primary flexuous sides ; secondary sides more prominent, keeled ; furrows not vittate. Hydrocotyle. Compressed fruit (mag.), with keeled sides and worn edges ; furrows uon-vittate. it are called intermediate ridges ; and the two on each side of the carpel are called lateral ridges ; the intervals which separate the primary ridges are called furrows, and are sometimes occupied by other or secondary ridges. Longitudinal resiniferous canals, called vittce, are developed in the thickness of the pericarp, and placed in the furrows, or 011 their cornmissural surface, or on the seed itself; they may be some- times absent. SEED pendulous, free or adhering to the pericarp. EMBRYO straight, minute, at the top of a horny albumen ; radicle superior. H H 2 • 468 CXIII. UMBELLIFERJ3. The following is the Candollean division of the order : — TRIBE I. UMBELLIFER.E ORTHOSPERM^E. — Seed flat or convex on its commissural face. TRIBE II. UMBELLIFER.E CAMPYLOSPERM.S. — Seed channelled, furrowed, or concave on its commissural face, either from the incurved margins, or from the inflexion of the two ends. [The following conspectus of the tribes of Umbelliferce is that elaborated for the ' Genera Plantarum,' and is a sketch only ; the classification of the genera of this order being a most difficult and complicated task, and there being many exceptions to the characters given : — Series I. HETEROSCIADIE.E. — Umbels simple, or regularly (rarely irregularly) compound. Vitto) 0. TKIBE I. HYDROCOTYLE.S. — Fruit laterally compressed or constricted at the narrow com- missure ; carpels dorsally acute or obtuse. Hydrocotyle, Trachymena, Xanthosia, Azarella, &c. TRIBE II. MULINE*. — Fruit exceedingly narrow at the commissure, 4-angled, or of 2 discoid carpels placed face to face, which are dorsally flat or concave. Bowlesia, Asteriscum, Mulinum, Hennas, &c. TRIBE III. SANICULEJ:. — Fruit sub-terete, commissure broad, dorsally compressed. *Eryi^ gium, Arctnpus, *Astrantia, Sanicula, Actinotns, Ac. Series II. HAPLOZYCJIE.*. — Umbels compound. Primary ridges only of the fruit con- spicuous ; vittie rarely absent in the furrows. TRIBE IV. ECHIHBPHOBE* — Flowers ? solitary in the umbels, sessile ; fruit iuvolucratc by the hardened pedicels of the $ flowers. One carpel perfect, sub-terete, the other arrested, slender or rudimentary. Echinophora, Pycnocycla. TRIBE V. AMMINEJ;. — Fruit laterally compressed, or constricted on both sides towards the commissure, or grooved. Sub-tribe 1. Smyrnwce. — Fruit broadly ovate or didymous. Seed hollowed or furrowed in front. Physospermum, Conium, Trachydium, *Arracacha, Smyrnium, &c. Sub-tribe 2. Euamminece. — Seed convex or flat in front. *Bupleurum, Lichtensteinia, Trinia, *Apium, Cicuta, Ammi, Carum, *Sium, Sison, jEgopodium, *PimplnellcL. Sub- tribe 3. Scandiclnece. — Fruit ovate, oblong, or linear. Seed grooved in front. Cunopodiiiiti, *Myrrhis, Orcotnyrrhis, Chcerophyllum, Scandix, * Anthriscus, &c. TRIBE VI. SESELINEJ;. — Fruit sub-terete or dorsally compressed, commissure broad ; lateral ridges distinct, thickened or slender, but not dilated. Sub-tribe 1. Eitseselinece. — Fruit sub-terete or rarely dorsally sub-compressed; primary ridges sub-equal, not winged. Seseli, *Foeniculum. Sub-tribe 2. Thecocarpeoe. — Fruit hard, terete, equally 5-angted or 5-winged ; carpels connate ; vittw obscure or scattered. Thecocarpiis, &c. Sub-tribe 3. Cachrydece. — Fruit sub-terete or dorsally compressed ; ridges obtuse, acute or winged. Vittse indefinite, adhering to the seed, and separating from the corky exocarp. Cachrys, Prangos, Crithimim, &c. Sub-tribe 4. (Enantlieve. — Fruit sub-terete or dorsally compressed, ridges wingless, the CXIIJ. UMBELLIFER.E. 469 lateral coherent as a thick, almost corky, margin to the fruit. Vittae solitary in the furrows. CEnanthe, JEtliusa, Siler, fyc. Sub-tribe 5. Schultziece. — Fruit more or less dorsally compressed, ridges wingless, the lateral hardly thickened. Vittae various or 0. Schultzia, Silans, &c. Sub- tribe 6. Selinece. — Fruit dorsally compressed or sub- terete, primary ridges or the carinal only produced into thickened wings ; wings equal, or the lateral broader. Meum, Ligmticum, Aciphylla, Selinum, Cymopterus, Anesorhiza, Pleurospermum, &c. Sub-tribe F. Angelicece. — Fruit dorsally compressed, dorsal and secondary ridges wingless or obscurely winged, lateral expanded into broad membranous or corky wings. Levisticum, Angelica, * ArcJi angelica, &c. TRIBE VII. PEUCEDANE.S. — Fruit dorsally much compressed, lateral ridges dilated into broad tumid or wing-like margins, those of the opposite carpels closely coherent, and appearing as one till dehiscence. * Ferula, Dorema, Peucedanum, Heracleum, Opopanax, Malabaila, Tordylium, &c. Series III. DIPLOZYGIE.S;. — Umbels compound. Furrows of the fruit thickened over the vittse, or furnished with secondary ridges. TRIBE VIII. CAUCALINEJ;. — Fruit sub-terete, ridges obtuse or prickly, or dilated into lobed or toothed wings. (Annuals or biennials.) *Coriandrum, *Cuminum, *Daucus, Caucalis, &c. TRIBE IX. LASERPITIE^E. — Fruit sub-terete or dorsally compressed; secondary ridges all, or the lateral only, much raised or winged. (Perennials, rarely biennials.) Laserpitium, Thapsia, Monizia, Elceoselinum, &c. — ED.] Umbettifera are allied to Araliacea by the inflorescence, alternate leaves, polypetalous, epigynous, and isostemonous corolla, valvate in bud, the inverted and anatropous ovule, and the minute embryo at the top of a copious albumen. Araliacece differ only in their fruit, which is usually fleshy [and often polycarpellary ; and conspicuously in habit]. Umbelliferce also approach Conwce (which see). Umbelliferce principally belong to the northern hemisphere, where they inhabit temperate and cool countries, especially the Mediterranean region and Central Asia. But few are met with in the torrid zone, where they only grow on high mountains and near the sea, where the heat is moderate. Umbelliferee contain a great many species, some alimentary, others medicinal or poisonous. These very different properties are due to principles which exist in various proportions either in the leaves, root or fruit ; the roots principally contain resins or gum-resins ; the fruits possess a volatile oil in the vittre of their pericarp or seed ; the leaves of some species are aromatic and spicy, of others narcotic and acrid. Such Umbelliferce are good for food as have a sufficient quantity of sugar and mucilage united to the hydro-carbon principles ; when the volatile oil predominates, as in the fruit of many, they become a stimulating medicine, and an agreeable condiment. We will briefly mention the indigenous species most remarkable for their properties, of this numerous family : — Cicutaria virosa (Water Hemlock). Root and stem with a yellowish very poisonous juice. Rarely used in medicine, as the Spotted Hemlock. Apium graveolens. Root aromatic, bitter, acrid, aperient, as is the fruit. Celery is a cultivated variety, of which the root and blanched petioles are used for food, and possess exciting qualities. Petroselinum sativum (Parsley). Herb and root used as a sauce. The expressed juice is recom- mended as an emollient and diuretic. ^Effopodium Podagraria (Gout-weed). A stimulant, diuretic and vulnerary. Carum Carui (Caraway). A stimulating stomachic, employed in the North to flavour bread and cheese. 470 CXIII. TJMBELLIFERJ5. Sunium Bulbo-castanum (Earth-nut). A tuberous globose stnrcby edible rootstock. Pinijrinella Anisum (Anise or Aniseed). The fruit contains an aromatic volatile and a fixed oil ; it is of a piquant and sweetish taste, and is much employed by confectioners and dealers in liqueurs ; recom- mended as a carminative, diuretic, diaphoretic, and even expectorant. Slum Sisarum and S. Ninsi (Water Parsnip, Skirrets). Natives of China and Japan, rarely cultivated in Europe. They have a sweet root with an agreeable aroma, considered to be an excitant. (Enanthe crocata (Meadow Saffron). A plant growing by river-sides. Root composed of oblong fascicled tubercles, of a mild taste, containing a milky juice turning yellow when exposed to the air, and eminently poisonous. JEthusa Cynapivm (Lesser Hemlock, Fool's Parsley). A very poisonous plant with a nearly glaucous stem striped with reddish lines, with finely-cut dark green leaves with a disagreeable and suspicious scent when bruised. It grows in all cultivated places, where it is often mistaken for Parsley, which differs from it, besides the characters of the fruit, 1st, in its bright clear green foliage with rather large divisions, the teeth of which are terminated by a little -white spot, and which have a fresh aromatic smell ; 2nd, in the stem, which is neither glaucous nor marked below with reddish lines. Plu'Uandrium aquaticum. A poisonous plant ; the aromatic fruit is employed in medicine as an antiphthisic and antidysenteric. Facninilum rulyare (Fennel). Fruit aromatic, stimulant, stomachic. Root and leaves aromatic, used in medicine, the one as nutritive, the other as stimulating. Crithmum maritimum (Samphire). Juice a vermifuge; leaves aromatic, used as a condiment [and for pickling]. Leristicum (iffidnak (Lovage, Mountain Hemlock). Roots and fruits with an agreeable smell, slightly iflHnulant and diuretic. Angelica Archanf/elica (Angelica). Root a tonic. Fruit a stimulant and stomachic. Leaves vulne- rary. Young stems preserved [in sugar] and eaten. Inijwatoria Ostntthitim (Master- wort). Root bitter, aromatic and stimulating. Pcuctdunttm offidnale (Sulphur- wort). Root containing a yellow foetid juice, formerly employed against hysterics ; an aperient and bechic. Anethum yraveulcns (Bustard Fennel). Fruit exciting, tonic, carminative, employed in dyspepsia. Pnstinaca oleracea (Parsnip). An alimentary and stimulating root. Heracleum Spondyhum (Cow-Parsnip). Root acrid aud bitter. Stem sugary, with a fermentable juice, which in the north yields a very intoxicating liquor. Cttminum Cyminum (Cumin). An Egyptian and Asiatic plant. Fruit aromatic, of a bitter and hot tnste, used as a stimulating medicine. Thalia rillotu (Deadly Carrot). A Mediterranean plant. Root purgative. Dauctts C'urotu (Common Carrot). A sugnry edible root; its juice is administered as an analeptic. Flowers very aromatic ; infused in alcohol they produce the liqueur called Oil of Venus. Myrrhis odorata (Sweet .Cicely). An aromatic plant, used for flavouring. Conium macitlalum (Hemlock). A poisonous plant, employed in cases of enlargement of the glands and viscera. Anthriscus Ccrtfolium (Chervil). Cultivated in kitchen gardens, of an agreeable scent and perfumed taste, without acridity or bitterness. Sniynri«m Ohtsatmm (Alexanders) Formerly esteemed as a vegetable ; leaves very aromatic ; root diuretic. Conundrum sufini/n (Coriander). Fruit fcwtid, witli the odour of bugs, becoming aromatic \vhendry ; used as a stimulating and stomachic medicine. Ifydrocoti/li' itxiufica. Prescribed in India against leprosy. Arracaclta esculent a is an Umbellifer cultivated on the high table-lands of the Andes ; its tubercled roots furnish an agreeable and digestible food. The gum-resins of some exotic Umbellifers are used in medicine; the most important is the Asa- foetida [Devil's Dung, Narthex Asafatida], which is procured from a Persian [West Tibetan] plant belonging to a ge ins near Fcrulu. This substance diffuses a very ftctid smell, and its taste is acrid and bitter. The Persians praise it as a delicious condiment; it is recommended by European doctors as the CXIV. ARALIACE^. 471 most powerful of anti-hysterical medicines, and is also administered in the treatment of asthma. The Sagapenum or Seraphic Gum is a strong-smelling substance, of an acrid and bitter taste, composed of a gum, a resin, and a volatile oil ; it comes from Persia like the Asafcetida, and its properties are analogous, though less powerful ; it probably belongs, like the latter, to a genus near Ferula. Galbanum has been employed for centuries as a stimulant of the nervous and vascular systems ; it comes from Syria, but its origin is unknown ; as is the case with the Laser [or Thapsia of the ancients], represented on some Phoanician medals or coins, and of which the juice was exported from Cyrenaica to Greece. Gum Ammoniac is procured from Dorema Amtnoniacum, a native of Persia and Armenia. This resin is at first of a sweetish taste, then acrid and bitter ; its qualities are the same as those of the Asafoetida, but it is less powerful in hysterical cases ; it is also employed to stimulate the functions of the abdominal viscera and respiratory organs. [The Sunibal, a very foetid musky drug, used as an antispasmodic, is the very large root of the Euryangium Sumbal, a native of Central Asia. — ED.] CXIV. ARAL1ACEJS. , Jussieu. — ARALIACE^E et HEDERACE^E, Bartling.) COROLLA polypetalous, epigynous, usually isostemonous. PETALS 5-10, valvate in bud. STAMENS inserted alternately with the petals, rarely more. OVARY inferior, of 2-many l-ovuled cells. OVULES pendulous, anatropous. FRUIT a berry. EMBRYO albuminous. RADICLE superior. STEM woody, rarely herbaceous, perennial, with cylindric, sometimes spiny branches, often climbing or attaching itself to other plants by nbrillse, whence they appear parasitic. LEAVES alternate, very rarely opposite, simple, pinnate or digi- tate ; petioles enlarged and thickened at the base ; stipules 0. FLOWERS $f , or imper- Aralia eduJit, 472 CXIV. Aralia. Tlower-bud (mag.). Aralia racemota. Flower (mag.). Aralia. Transverse section of flower (mag.). Aralia. Flower crowned by the calyx (mng.). Aralia. Vertical section of ovary (mag.). Aralia, Transverse section of ovary (mag.). Ivy. Seed (mag.). Ivy. Fruit. tttdera Helix. Ivy. Ivy. Diagram. Ivy. Reynoldsia SandwicentU. Seed cut Flower cut vertically (mag.). vertically (mag.). CXIV. ARALIACE^E. 473 Gastonia. Petals separating in one piece like the operculnm of a pyxidium (mag.). Gastonia. Transverse section of ovary (mag.). Gastonia. Polygynous pistil (mag.). Adoza moschatellina. Adoxa. Pentamerous flower (mag.). Adoxa. Seed (mag.). Adoxa. Seed cut vertically (mag.). Adoxa. Vertical section of ovary (mag.). Adoxa. Pentamerous flower seen from above (mag.). Adoxa. Tetramerous flower seen from above (mag.). Adoxa, Fruit crowned by the calyx (mag.). Helwingia rutriflora. Adoxa. Vertical Fection of fruit (mag.). 474 CXIV. AKALIACE^E. feet through arrest, regular, in umbels, naked or involucrate capitula, racemes or panicles. CALYX superior, usually short, entire or toothed. PETALS 5, 10 or more, inserted on the edge of an epigynous disk, valvate or imbricate in bud, free, or cohering at the top and detaching like a cup. STAMENS inserted alternately with the petals, rarely double or treble in number (or indefinite) ; filaments short, distinct, very rarely 2 -partite (Adoxa ') ; anthers ovoid or linear, introrse, incumbent, of 2 opposite cells opening longitudinally. OVARY inferior, crowned by the disk, of 2-15 1-ovuled cells ; styles equalling the cells in number, sometimes cohering, often very short ; stigmas simple ; ovules suspended from the top of the cells, anatropous ; berry fleshy or dry, crowned by the calyx. SEEDS inverted; testa crustaceoug, sometimes margined. EMBRYO minute, straight, at the top of a fleshy copious albumen ; coty- ledons short ; radicle superior. TRIBE I. ARALIE&. Corolla quite polypetalous, aestivation valvate. Stem usually woody. PRINCIPAL GENERA. * Aralia. * Ileclera. * Panax. * Oreopanax. * Dendropanax. * Paratropia. * Sciadophyllum. * Uidymopanax. * Gastonia. TRIBE II. Corolla sub-polypetalous, aestivation imbricate. Filaments 2-partite. Stem herbaceous. GENUS. Adoxa. [The genera of Araliacew have been re-examined and arranged as follows in the c Genera Plantarum' :— TRIBE I. AUALIEJE. — Petals more or less imbricate, attached by a broad base. Stilbocarpa, Aralia, Pentapanax, &c. TRIBK II. MACKINLAYEJ:. — Petals shortly clawed, involute, valvate. Mackinlaya. TRIBE III. PANACEA. — Petals valvate. Stamens as many as the petals. Albumen not ruminate. Horsfieldia, Panax, Acanthopanax, Fatsia, Didymopanax, Helwingia, Heryta, Sciado* phyUum,) Heptapleurum, Dendropanax^ &c. TRIBE IV. HEDEREJ;. — Petals valvate. Stamens as many as the petals. ' Albumen ruminate. Arlhropliyllum^ Cussonia, Oreopanax, Hedera, &c. TRIBE V. PLERANDRE.S. — Petals valvate or connate. Stamens very numerous. Styles 0, or cohering in a cone. Plerandra, Tupidanthus, i-ya, elltptica 478 CXVI. GARRYACE.&2. Garrya. flower closed (mag.). Garrya. flower open (mag.). Garrya. Garrya. Vertical section of fruit (mug.). Vertical section of ovary (uiiig.). (iarryu. Anther, inncT face (mug.). llarrya. Garrya. Antlicr, Transverse section of seal, dorsal face showing the central embryo (mat?.). (mag.)- Garrya. Transverse section of ovary, Garrya. showing the arrangement of the Embryo ovules and embryo (mag.)' (mug.). 9 flower (mag.). horicarj>uf. Ovary cut Diagram of a 3-flowered cyme, furuialied vertically (mag.). with three bracteolea. Ovary cut transversely, with four cells, two of which arc .sterile (mag.). Corolla tubular, limb regular or irregular. Style filiform. Seeds with a dorsal raphe. PRINCIPAL GENERA. Triosteuni. * Symphoricarpus. * Abelia. Linneea. Lonicera. * Leycesteria. Diervilla. Alseuosmia. * Weigelia. CXVII. CAPEIFOLIACE^]. SUB-ORDER II. SAMBUCE^l. 481 Guelder Eose (Viburnum Opulus). Elder (Sambucus nigra). Flowering corymb. Elder. Diagram. Elder. Berry crowned by the calyx (mag.). Elder. Fruit cut vertically (mag.). I I Viburnum. Flower (mag.). Viburnum. Viburnum. Ovary cut Seed transversely (maj.)- (mag.). Viburnum. Seed cut vertically (mag.). Elder. Flower (mag.). Viburnum. Berry crowned by the calyx (mag.). Elder. Vertical section of the flower (mag.). 482 CXVII. CAPEIFOLIACE^. Elder. Pistil and calyx (mag.). Elder (Sambiifui niyra). Ripe fruit. Elder. Seed entire and cut vertically (mag.). Corolla regular, rotate. Stigmas 3, sessile. Seeds with a ventral raphe. PRINCIPAL GENERA. * Viburnum. * Sambucus [Adoxa, see p. 474], We shall hereafter indicate the affinities of Caprifoliacetf with J'nlcrianete and Dipsacea. The affinity with Itubiacne is much more obvious ; it is founded on the epigynous isostemonous corolla, the several-celled ovary, the axile embryo in a thick fleshy albumen, the opposite leaves and knotty stem. Almost the only difference is in the imbricate corolla and the absence of stipules. The sub-order of tiambucrte is closely allied to Cornea, which only differ in the many petals, valvate in bud. The same affinity may be noticed with Araliacea- and UmbelUferm ; but these, besides the polypetalous and valvate corolla, differ from Cuprifoliacete in the alternate leaves and the umbelled or capitate inflorescence. An analogy has also been pointed out between the Hydrangea: (of Saxifragca*} and Viburruts. Caprifoliacea; inhabit the temperate regions of the northern hemisphere, especially central Asia, the north of India, and of America. A small number [many Viburnums] inhabit the intertropical zone, pre- ferring the mountains, where the temperature is colder. The Elder, a cosmopolitan genus, is represented by a very few species in the southern hemisphere. [Abeuoimia is a New Zealand genus, remarkable for the intensely sweet odour of its flowers]. The flowers of most Caprifoliacea exhale a sweet odour, especially after sunset. They contain an acrid, bitter and astringent principle, which has caused some to be placed among medicinal plants. The berries of the Honeysuckle (Lonicera Caprifoliumi) are diuretic ; those of L. Xylost.eum are laxative. The stems of DiernHa canadenm are employed as a depurative in North America. The roots of the common Symphoricarpot parviflora, a Carolina shrub, are used by the Americans as a febrifuge. All these species are cultivated in European gardens. The common Elder (Sambucus niyra) produces numerous berries, which are cooked and eaten in Germany [and also extensively used in the manufacture of wine]. Pharmacists prepare from these berries, as also from those of S. Ebuhts, an extract, or purgative rob. The dried flowers of the common Elder are an excellent sudorific, employed against snake-bites; they are also used to give to certain wines a Muscat flavour. The Linnaa borealis, an elegant evergreen herb, abounds in the forests of Sweden, the country of Linnieus, to whom it has been dedicated. Swedish doctors recommend its stem and leaves as diuretics and sudorifics. CXVIII. EUBIACE^. 483 CXVIII.—RUBIACEJE. A. L. de Jussieu. — LYGODYSODEACEJB et RUBIACE^E, Bartling. — CINCHO- , LYGODYSODEACE^E et STELLATE, Lindl.) Madder. Flower cut vertically (mag.). Coffee. Berry (inag.). Coffee. Seed (mag.). Dorsal face. Coffee. Transverse section of the seed (mag.). Oalium. Flowering branch. Galium. Pistil (mag.). Galium. Fruit cut vertically (mag.). Madder. Ovary cut transversely (mag.). Coffee. Seed. Dorsal face cut to show the minute embryo at the base of the albumen (mag.). I i 2 484 CXVIII. RUBIACE^E. Leptodermit. Transverse section of fruit, showing the involute arrange- ment of the cotyledons (mag.). Ltptodtrmi*. Flower (mag.). Lfptotlcrmit. Ovary cut ver- tically, showing a trcllised septum (mag.). Oouvardiu. Vertical section of ovary (mag.). Cinchona. Capsule opening at its base by scpticidal dehiR- cence (mag.). liuuwrdia. Diagram. Coprosma. Berry with two nuts, cut transversely. Bouvardia. Flower (mag.). Bouvardia. Flower cut vertically (mag.). Lueulia. Flower seen from above, with convolute (estivation (mag.). Lueulia. Diagram. Coprosma. flower (mag.). Coprosma. 9 flower (max.). CXVIII. KUBIACE^E. 485 COROLLA monopetalous, epigynous, isostemonous, wstivation valvate or [imbricate or] contorted. STAMENS 4-6, inserted on the corolla-tube. OVARY inferior, bi-pluri- locular ; OVULES anatropous, or semi-campylotropoiis. EMBRYO almost akvays albu- minous.— LEAVES opposite, stipulate. TREES, SHRUBS or HERBS, usually with tetragonous knotty jointed stems. LEAVES opposite [or whorled], simple, usually entire, stipulate; stipules various, sometimes free, sometimes united to the leaf or the neighbouring stipule, sometimes leaf-like, and appearing to form a whorl with the leaves, but distinguished by the absence of buds. FLOWERS usually $ , very rarely unisexual, sometimes sub-irregular, generally cymose, panicled or capitate. CALYX superior or semi-superior, tubular, or deeply cut or 2-6-fid or -toothed or 0. COROLLA superior, monopetalous, infundi- buliform or hypocrateriform or rotate [rarely 2-labiate, Henriquezia, Dichilanthe, &c.] ; limb of 4-6 segments, usually equal, aestivation valvate, rarely contorted or imbricate. STAMENS 4-6 [2 in Carlemannia and Sylvianthus], inserted on the tube, very rarely coherent ; anthers introrse, bilocular, dehiscence longitudinal, distinct, very rarely cohering in a tube. OVARY inferior, bi-pluri-locular, crowned by a more or less developed fleshy disk ; style simple bifid or multifid, stigmatiferous at the top or inner surfaces or sides of the arms ; ovules solitary or 2 or more in each cell, erect or pendulous, or ventrally attached to the central angle or septum of the cell, or to a prominent placenta, anatropous or semi-campylotropous. FRUIT a capsule, berry or drupe. SEEDS in various positions ; albumen fleshy or cartilaginous, or almost horny, rarely scanty or 0, sometimes involute. EMBRYO straight or curved, in the base or axis of the albumen ; cotyledons flat, rarely involute ; radicle usually inferior. [Sketch of the arrangement of Eubiacece into tribes, as recently constructed for the ' Genera Plantarum ' : — SERIES A. Ovules indefinite. Sub-series I. Fruit dry, capsular or indehiscent. * Flowers collected in a globose head.1 TRIBE I. NAUCLE.E. — Corolla narrow, infundibuliform, lobes never contorted. Stigma much exserted, entire. Sarcocephalus, Cephalanthus, Adina, Nauclea, Ifncaria, &c. * Flowers not collected into spherical heads. TRIBE II. CINCHONEJ;. — Corolla-lobes valvate, imbricate or contorted. Capsule 2-celled, seeds winged. Cinchona, Cascarilla, Ladenbergia, Bouvardia, Manettia, Hindsia, Hillia, Exo- stemma, LucuUa, &c. TRIBE III. HENRIQUEZIE^. — Corolla 2-labiate. Ovules geminate. Seeds very broadly winged, exalbuminous. Henriquezia, Platycarpum. TRIBE IV. COKDAMINIE^. — Corolla-lobes valvate. Capsule 2-celled. Seeds numerous, minute, not winged. Trees and shrubs. Condaminea, Portlandia, Bikkia, Pinkneya, &c. TKIBE V. RONDELETIE^. — Corolla-lobes imbricate or contorted. Seeds very numerous, albuminous, not winged. Rondeletia, Wendlandia, Augusta, Deppea, Sipanca, &c. TRIBE VI. HE DYOTIDE^!.— Corolla-lobes valvate. Ovary 2-4-celled. Seeds numerous, 1 See also under tribes Gardeniea and Morindece. 486 CXVIII. EUBIACE^. angular, not winged. Herbs ; rarely small shrubs. Dentella, Argostemma, Pentas, Hedyotin, Oldenlandia, Houstonia, Kadua, Ophiorhiza, Carlemannia, &c. Sub-series II. Fruit fleshy or coriaceous, indehiscent. TRIBE VII. MUSS^NDE^!. — Corolla-lobes valvate. Seeds very numerous, minute, usually angled. Musscenda, Isertia, Gonzalea, Adenosacme, Urophyllum, Sabicea, Coccocypselum, &c. TRIBE VIII. HAMELIE.E. — Corolla-lobes imbricate or contorted. Seeds very numerous, minute, angular. Hamelia, Hoffmannia, Bertiera, Gouldia, &c. TRIBE IX. CATESB.EE.E. — Corolla-lobes valvate. Seeds many, rather large, compressed. Catesbaia, Pentagcmia, &c. TRIBE X. GARDENIE.E. — Corolla-lobes contorted. Seeds few or many, large and compressed, or smaller and angled. Aliberta, Amajoua, Duvoia, Posoqueria, Tocoyena, Burchellia, Webera, Randia, Gardenia, Genipa, Pouclietia, Petunga, Diplospora, &c. SERIES B. Ovules geminate in each cell. (See also Tribe III. Henriquezia) . TRIBE XI. CRUCKSHANKIEJB. — Corolla-lobes valvate. Ovary 2-celled, ovules numerous. Capsule 2-valved. Cruckslianlcia, Oreopolus. TRIBE XII. RETINIPHYLLE.E. — Corolla-lobes contorted. Ovary 5-7-celled. Drupe with 5—7 pyrenes. Retiniphyllum, Kotchubcca. SERIES C. Ovules solitary in each cell. Sub-series I. Radicle superior. TRIBE XIII. GUETTARDEJE. — Corolla-lobes imbricate or valvate. Stamens inserted on the corolla-throat. Seeds pendulous from the top of the cell, usually exalbuminous, with a thickened funicle. Guettarda, Antirrhoca, Machaonia, Timonim, Chomelia, Halanea, Dichilanthe, &o. TRIBE XIV. KNOXIE*. — Corolla-lobes valvate. Stamens inserted on the throat of the corolla. Seeds compressed, albuminous. Knoxia, Pentanixia. TRIBE XV. CHIOCOCCEJE. — Corolla-lobes valvate or imbricate. Stamens inserted at the base of the corolla. Seeds albuminous. Erilhalis, Chiococca, Chione, &c. TRIBE XVI. ALBERTE.E. — Corolla-lobes contorted. Stamens inserted on the throat of the corolla. Seeds albuminous. Cremaspora, Alberta, &c. TRIBE XVII. VANGUERIE.E. — Corolla-lobes valvate. Stamens in sorted on the throat of the corolla. Seeds albuminous. Plectronia, (Canthium'), Vangueria, Cuviera, &c. Sub-series II. Radicle inferior. * Corolla contorted. TRIBE XVIII. IXORE.E. — Ovules attached to the middle or about the middle of the cell, rarely basilar. Ixora, Pavetta, Coffea, Hyonima, Strumpfia, &c. * * Corolla valvate. f Ovules attached to the septum at or below the middle. TRIBE XIX. MORINDEJ;. — Flowers often united by the calyx- tube into heads. Morinda, T)amnacanthus, Prismatomeris, &c. t t Ovules basilar, erect, anatropous. TRIBE XX COUSSARE.E. — Ovary 1 -celled, or with an evanescent septum. Fruit 1-seeded. Coussdrea, Faramea, &c. CXVIII. KUBIACE^. 487 TRIBE XXI. PSYCHOTRIEJ:. — Stamens inserted on the throat of the corolla. Stigma entire or style-arms short. Fruit indehiscent. Psychotria, Palicourea, Rudgea, Declieuxia, Geophila, Cephaelis, Lasianthus, Suteria, Saprosma, Psathyra, &c. TEIBE XXII. P^DEEIE^!. — Stamens inserted on the throat or base of the corolla. Ovary 2-5-celled ; style-arms filiform. Fruit capsular or of 2 cocci. Pcederia, Lygodisodea, Hamil- tonia, Leptodermis, &c, TRIBE XXIII. ANTHOSPERME^. — Flower usually unisexual. Stamens usually inserted at the base of the corolla. Ovary 1-4-celled. Style entire, or arms filiform. Fruit a berry, or in- dehiscent. Putoria, Crocyllis, Mitchella, Serissa, Ooprosma, Anthospermum, Phyllis, Opercularia, Pomax, &c. t t t Ovules attached to the septum, amphitropous. TRIBE XXIV. SPERMACOCE^I. — Herbs or small shrubs. Leaves usually opposite and stipules setose. Triodon, Diodia, Gaillonia, Spermacoce, Emmeorhiza, Mitracarpiim, Richardsonia, Ac. TRIBE XXV. GALIE.S. — Herbs. Leaves and stipules similar, forming a whorl. CalUpeltif> Vaillantia, Rubia, Galium, Asperula, Cmcianella, Sherardia, &c. — ED.] We have indicated the affinity of Rubiacece with Caprifoliacece and Dipsacece (see these families). The Rubiacece with many-ovuled cells are allied to LoyaniacecR in all their characters, and are only dis- tinguished by their epigyny. Gentianete, Oleinece, and Apocynece also approach them, although hypo- gynous, in the opposite leaves, sestivation, isostemonous corolla and the presence of albumen. Some Gemeraccfe also approach the section Coffeacea, as shown by their whorled or opposite leaves, the development of their receptacular cupule, the varied nature of their fruit, and the presence of albumen; but they are widely separated by the didynamous stamens, unilocular ovary and parietal placentation. Rubiacece mostly inhabit iniertropical regions ; [but Galiece are almost exclusively temperate]. The principal medicinal species of this family are exotic ; and of these the most important are Quinine and Ipecacuanha. The latter is the root of a little shrub, a species of Cephaelis, inhabiting the virgin forests of Brazil ; the bark of this root has an acrid taste and a nauseous smell ; it contains an alkaloid (emetine), but in practice the root is preferred to the alkaloid. This medicine is invaluable in dysentery, asthma, whooping-cough, and especially puerperal fever. Quinine is yielded by the bark of several species of Cinchona ; they are evergreen trees or shrubs, inhabiting the valleys of the Andes of Peru, at heights varying from 4,000 to 11,000 feet above the level of the sea. The bark is bitter, and contains two organic alkalis (quinine and cinchmine), united to a special acid ; it contains, besides colouring matter, a fatty matter, starch, gum, &c. The preparation of these vegetable alkalis is the most important service that chemistry has rendered to medicine since the beginning of the nineteenth century, for without ex- hauating the patient, enormous doses of quinine may be administered in a concentrated form, effecting the most difficult cures. Quinine is the most powerful specific in cases of intermittent fevers (of which marsh miasma is the most common cause) ; acting, not by neutralizing the miasma as a counter-poison would do, but by strengthening the system, and thus enabling it to resist the incessant attacks of the morbific cause. Besides its virtues as a febrifuge, quinine is a first-class tonic in hastening convalescence, and restoring the digestive functions. Lastly, Cinchona bark is used outwardly as an antiseptic to arrest the progress of gangrene ; its antiseptic properties are however not due to its febrifugal principle, but to the astringent principles with which the bark abounds. The American genus Chiococca, like Cephaelis, belongs to the uniovulate section, some species of which possess a root reputed valuable against snake-bites ; this root, known as cainqa, is used in Europe as a diuretic and purgative in cases of hydrophobia. Of all the Rubiacece of the Old World the Coffee is the most noticeable ; forming as it does, with cotton and sugar, the staple of the maritime commerce of Europe. The Coffee is an evergreen shrub, a native of Abyssinia, which was introduced three centuries ago into Arabia, towards the close of the seventeenth century into Java, and finally naturalized in 1720 in the Antilles. The seed of the Coffee yields, besides various oily, albuminous and gummy matters, a bitter principle containing an organic crystallizable alkali named caffein, associated with a peculiar acid. A slight roasting develops in this 488 CXIX. VALERIANE.E. seed that agreeable aroma and taste of which advantage has been taken to prepare a drink which specially stimulates the functions of the brain. To those who do not habitually drink it, coffee may become a useful medicine ; it succeeds in the treatment of intermittent fevers ; it relieves asthma, and it is said gout also : and it counteracts the effects of wine or of opium. Its most prevalent use as a medicine is in curing headache. Some indigenous Rubiacete were formerly used as medicines ; thus an infusion of the flowering tops of the Yellow Galium was given to nurses to increase the secretion of milk, and as an antispasmodic. They are now employed in many countries, and especially in England, to give a yellow colour to cheese. The Squinancy (Atptrulacynanchica) the leaves of which contain a bitter slightly astringent principle, was used in cases of angina. Axperula odorata, the perfume of which comes out when dried, was praised as a tonic and vulnerary; it b now only used to give a bouquet to Rhine wines, and gardeners cultivate it as an edging. Madder (Jiubia titu-iuntm) grows wild in the Mediterranean region ; it is cultivated at Avignon, in Alsace, and in Zealand, on account of the red colouring matter contained in the root, and which is largely used for dyeing fabrics. Thia dye, in a pure state, is called alizarine. It also exists, but in less quantity, in the root of the Chaya-ver, a I'ubiaceous plant, which is cultivated on the Coromandel coast. [Probably the Bengal Madder (Muty'eet) is here alluded to ; it is cultivated throughout India.] [The above notice of the useful liufjiacea; must be largely extended ; very many species contain bitter febrifuge principles, especially Exodemma, JlondeM-in, and Ctmtlaminea in South America ; as also Pink- neya in Carolina, JIymen(fdicty.] CXIX. VALERIANE^E. (DiPBACEAEUM gectio, A. L. de Jussieu. — VALEEIANE^E, D. C. — VALEEIANACE^E, Lindl.) COEOLLA monopetalout, ejnyynous, aestivation imbricate. STAMENS 5-4-3-1, in- serted on the corolla-tube. OVAEY 3-celled, two cells without ovules, the third l-ovuled ; OVULE pendulous, anatropous. EMBEYO exalbuminous. Annuals with slender inodorous roots, or perennials with a usually strong-scented rhizome. LEAVES : radical fascicled ; cauline opposite, simple ; petiole dilated, ex- Btipulate. FLOWEES perfect, or unisexual by arrest, in a dichotomous cyme or close corymb, or solitary in the forks, and bracteate. CALYX superior, sometimes cut into 3-4 accrescent teeth, or reduced to a single tooth ; sometimes of bristles which are involute before flowering, when they unfold into a plumose deciduous crown. COEOLLA monopetalous, inserted on a disk crowning the top of the ovary, tubular-infundibuli- form ; tube regular, or produced at its base into a knob or hollow spur ; limb with 5-4—3 equal or sub-labiate lobes, testivation imbricate. STAMENH inserted above the middle of the corolla-tube, alternate with its divisions, rarely 5, usually 4 by sup- pression of the posterior stamen, or 3 by suppression of the posterior and a lateral stamen; sometimes the posterior only i.s developed ; filaments distinct,, exserted ; anthers introrse, 2-celled, d<;hiHcoMr<: longitudinal. OVAEY inferior, .'{-<-. -ii.-d, two cells empty, the third I'ltiN:; style simple, filiform; at'iyma undivided or 2-3-fid; ovule solitary, pendulous from the top of the cell, anatropous. FEUIT dry, indehis- CXES. YALERIAXILE. 490 CXIX. VALERIANE^. Centranthut. Flower (mag.)' Centranthus. Transverse sections of flower and ovary (mag.). Ctntrtfitthut ruber. Centranthiu. Nearly ripe fruit (mag.). Centrantltus, Fruit cut transversely (mag.). Centrantftut. Vertical section of seed (mag.). Gtntranthui. Kipe frnit crowned by the calyx (mag.;. cent, coriaceous or membranous, 3-celled or 1 -celled by suppression of the empty cells, always 1-seeded. SEED inverted. EMBEYO straight, exalbuminous ; radicle superior. PRINCIPAL GENERA. Valerians. * Centranthus. * Fedia. * Valerianella. Nardostachys. I'atrinia. The family of Valerianea is very near Dipsacete ; 03 indicated by their opposite leaves, irregular terminal flowers, epigynous tubular staminiferous corolla, imbricate aestivation, solitary pendulous nna- tropous ovule, and simple style. The diagnosis consists in the corymbiform cyme, the three-celled ovary, and the exalbuminous peed. Valerianea approach Composite in their toothed or plumose calyx, epigynous ataminiferoua corolla, and solitary exalbuminous seed; they are separated from it by their inflorescence, aestivation, nervation of the corolla, free anthers, three-celled ovary and pendulous ovule. They offer some analogy with Caprifoliacea in the terminal inflorescence, opposite leaves, {estivation, CXX. CALYCERE^. 491 epigynous corolla, several- celled ovary and pendulous ovule ; but the latter differ in the woody stem, axile placentation, fleshy fruit and albuminous embryo. Vakrianece are mostly natives of the Old World, and principally of Central Europe, the Mediter- ranean and Caucasian regions, whence some species have advanced eastwards into Siberia, Nepal and Japan. They abound on the Cordilleras of South America, extending abundantly into Chili, Fuegia, and the Falkland Islands. They are very rare in North America. Valerianeai possess medicinal qualities known from an ancient period ; but these properties are much more marked in the perennial than in the annual species, where they have not time to be elaborated. Their rhizomes contain a volatile oil, a peculiar acid, a bitter principle and starch ; their taste is acrid and their odour penetrating. Valerianece now rank at the head of the vegetable antispasmodics ; the principal species is the Valeriana officinalis, which grows in Europe in damp meadows. Celtic Nard is yielded by two Alpine species [ V. celtica and Saliunca] which inhabit the limits of the eternal snows [in Styria and Carinthia], whence their roots are sent to Turkey, and largely used to scent baths and as a medicine. It also enters into the very complicated electuary called theriaque. The Spikenard of the ancients, Indian Nard of the moderns, Nardostachys Jatamansi, is greatly esteemed in India on account of its aroma and stimulating properties. In the annual Valerianete the leaves are not bitter like those of the perennial species ; this bitterness is replaced by a somewhat vapid mucilage, relieved by a slight quantity of volatile oil, which renders them edible ; such are the Valerianellas [species ofFedid], Lamb's Lettuce, Corn Salad, of which the young leaves are used for salad. CXX. CALYCEREJE. , R. Br. — BOOPIDE^E, Cassini.) FLOWERS in an involucrate capitulum. COROLLA epigynous, monopetalous, isoste- monous, aestivation valvate. ANTHERS syngenesious at the base. OVARY 1-cetteA, 1-ovuled ; OVULE pendulous, anatropous. EMBRYO albuminous. Annual or perennial HERBS. LEAVES alternate, sessile, without stipules. INFLO- RESCENCE in a capitulum. with an involucre of one or more series of bracts. FLOWERS sessile on a paleaceous or alveolate receptacle, sometimes all fertile, sometimes mixed with flowers of which the pistil is suppressed, the fertile sometimes cohering below. CALYX of 5 usually unequal segments, persistent. COROLLA inserted on an epigynous disk, monopetalous, regular ; tube elongated, slender ; limb 5-fid, segments with a dorsal and two sub-marginal nerves, aestivation valvate. STAMENS 5, inserted at the bottom of the corolla-tube, and alternate with its segments ; filaments coherent to the corolla-tube throughout its length, free near the throat, and monadelphous or separate ; anthers introrse, bilocular, cohering at the base, free at the top, dehiscence longitudinal. OVARY inferior, 1-celled, 1-ovuled, crowned by a conical disk uniting the base of the corolla to that of the style, lining the corolla-tube, and dilating near the throat into 5 glandular areolsB ; style terminal, simple, exserted, tip clavate and glabrous ; stigma terminal, globose ; ovule pendulous from the top of the cell, anatropous. ACHENES usually crowned by the accrescent calyx and marcescent •corolla, sometimes connate. SEED inverted, raphe longitudinal, chalaza apical. EMBRYO straight, in the axis of a fleshy albumen. GENERA. * Calycera. * Boopis. * Acicarpha. 492 CXX. CALYCEEE^. C'alycera balsatnitifolia. Calyctra. Flower (mag.). Calyctra. Flower cut vertically (mag.). D Calycera. Diagram. Calycera. Two stamens laid open Calyctra. Pollen-grains (mag.). (mag.). - Calycera. Calycera. Flowers and bracts (mag.). Andrcecium and style (mag.). Calycera. Vertical section of capitulum (mag.). CXXI. DIPSACE^. 493 Calycera, Fmit crowned by the accrescent calyx. Calyfera. Anatropous ovule (mag.). Calycera. Cylindric embryq (mag.). Calycera. Seed cut vertically (mag.). Calycerea is closely allied to Composite, but is distinguished by the nervation of the corolla, monadel- phous filaments, position of the ovule, absence of collecting hairs, globose stigma, and albumen. It is. equally near Dtpsacea, from which it differs in the alternate leaves, valvate aestivation, and monadel- phous and syngenesious stamens. The species are not numerous, and mostly inhabit temperate South America. GXXI. D IPS ACE ^E. (DIPSACE^E, A. L. de Jussieu.} COROLLA monopetalous, epigynous, (estivation imbricate. STAMENS 4, inserted on the tube of the corolla. OVARY \-celled, 1-ovuled, adnate to the receptacular tube throughout its length, or only at the top ; OVULE pendulous, anatropous. EMBRYO albuminous. Annual or perennial HERBS. LEAVES opposite, rarely whorled, exstipulate. FLOWERS perfect, more or less irregular, gathered into a dense capitulum, involu- crate, on a naked or paleaceous receptacle, very rarely in a whorl in the axil of the upper leaves, and each furnished with a calyciform obconic involucel, the tube of which is pitted at the top or furrowed lengthwise, and its limb scarious. CALYX superior, cup-shaped, or in setaceous segments forming a naked or bearded plumose crown. COROLLA superior, monopetalous, tubular, inserted at the top of the recep- tacular tube; limb 5-4-fid, usually irregular, sometimes labiate, ssstivation imbricate. STAMENS 4, often unequal, rarely 2-3, alternate with the corolla-lobes, inserted at the bottom of the tube ; filaments exserted, distinct, or rarely united in pairs ; anthers introrse, 2-celled, dehiscence longitudinal. OVARY inferior, 1-celled, 1-ovuled, some- times free in a receptacular tube which is closed at the top, sometimes adhering to this tube throughout its length, or at the top only ; style terminal, filiform, simple, united at its base to the neck of the receptacular tube ; stigma simple, clavate, or very shortly and unequally 2-lobed ; ovule pendulous from the top of the cell, ana- tropous. UTRICLE enclosed in the receptacular tube and the involucel. SEED inverted, testa membranous, hardly separable from the pericarp. EMBRYO straight, in the axis of a fleshy scanty albumen ; radicle superior. * Dipsacus. * Morina. GENERA. * Cephalaria. Knautia. * Scabiosa. Pterocephalus. 494 CXXI. DIPSACE^. Scabious. Fruit (mag.). Scabious (Scat/iota atropurpurea). Capitnlum. Scabious. Jtey flower cut vertically (mag.). Scabious. Ray flower seen in front (mag.). Scabious. Ray flower in profile (mag.). Scabious. Diagram. Scabious. Fruit cut vertically (mag.). Scabious. Unopened capitnlum, seen from behind. Scabious. Disk flower, cut vertically (mag.). Dipioevs. Fruit cut vertically (mag.). DipsacecB are so nearly allied to Valerianece that A. L. de Jussieu placed them in the same family (see Valerianeat). They resemble Composites in their inflorescence, which in all the genera except Morina is an involucrate capitulum, in their usually paleaceous receptacle, epigynous staminiferous corolla, one-celled ovary crowned by a toothed or plumose calyx, and solitary anatropous ovule; they differ in the separate involucel of each flower, imbricate aestivation, nervation of the corolla, free anthers, pendulous ovule, simple style, terminal stigma, and albuminous embryo. They approach Calycerefe in CXXII. COMPOSITE. 495 their inflorescence, in the epigynous statniniferous tubular corolla, one-celled ovary, solitary pendulous ovule, and albuminous seed ; but the opposite leaves, imbricate aestivation, and free anthers render the identification easy. Brongniart has placed Dipsacece and Caprifoliacea in the same class ; their analogies are founded on their epigynous corolla, aestivation, pendulous and anatropous ovule, axile embryo in a fleshy albumen, and opposite leaves ; but the inflorescence, 1-celled ovary, solitary ovule, and apical placentation form a promi- nent line of demarcation. Dipsacea inhabit temperate and hot regions of the Old World and of Africa situated beyond the tropics. The rhizome and leaves of some Dipsacece are medicinal, containing a bitter-sweet slightly astrin- gent principle. Scabious is administered as a depurative in cutaneous disorders. The roots of the Teasel (^Dipsacus syhestris) are diuretic and sudorific ; its leaves and root were formerly considered to be a remedy for hydrophobia. The capitula of Dipsacus fullonum, a species of which the origin is unknown, are furnished with recurved hard and elastic bracts, which have led to their employment by clothiers for carding woollen and cotton fabrics ; hence its vulgar pame of Fuller's Teasel. CXXII. COMPOSITE. (COMPOSITE, Vaillant. — SYNANTHEE^E, L.-G. Richard.) D.c c. Dandelion. TTnexpanded head, fur- nished with a calyculus of accessory bracts, 2- seriate and reflexed. L M Dandelion. Young carpel opened (mag.), showing the ovule with the two cords of the conducting tissue, C p ; Car, ovary ; L c, calyx ; D e, epigynous disk ; B, raphe ; Ch, chalaza ; M, micropyle. Dandelion. Capitulum (ligulifloral). Dandelion, floret with ligulate corolla, and calyx forming a tuft of simple hairs, shortly stipitate when young (mag.). Dandelion. Common receptacle and fruits. Dandelion. Fruit in a simple tuft, long stipitate when ripe (mag.). 496 CXXII. COMPOSITE. Salsify. Fruit crowned by a calyx with a feathery tuft, and shortly stipitate. Chicory. Fruit crowned by a short paleated calyx (mag.). Chicory. Fruit cut vertically, shewing the upright seed (mag.). Corolla and androacium laid open (mag.). Ncuiauvia. Flower with bilabiate corolla (mag.). ffassauvia. Spike (labiatifloral). Nassauvia. Stamen (.mag.). tfcusauvia. Ovary and portion of style (mag.). Nassauvia. Style (mag.). FLOWERS in an involucrate capitulum. COEOLLA epigynous, monopetalous, isoste- monous, valvate in aestivation. ANTHEES syngenesious. OVAET 1-celled, l-ovuled ; OVULE erect, anatropous. EMBRYO exalbuminous. PLANTS generally perennial, mostly herbaceous, sometimes woody below, rarely arborescent. LEAVES generally alternate, often very much cut, rarely compound, exstipulate, but sometimes furnished with stipuliform auricles. CAPITULA some- times few-flowered, very rarely 1 -flowered, generally many-flowered; inflorescence indefinite, but forming collectively a definite inflorescence, in a corymb, cyme or glomerule, and composed of flowers inserted on a common receptacle. RECEPTACLE sometimes furnished with bracteoles (palece, scales, bristles, fimbrilloe), sometimes naked and smooth, or with small pits (foveolate), or deeply pitted (alveolate), with entire or toothed margins, or cut into membranous segments, or covered with CXXII. COMPOSITE. 11)7 pentagonal areolse, that enclose the bases of the flowers. INVOLUCRE (peri- clinium) composed of one or many series of bracts (scales or leaflets), sometimes furnished outside with accessory bracts (calyculi). FLOWERS g, or $ or $ or neuter, sometimes all £ in one capitulum ; sometimes ?', or neuter at the circumference, the inner $ ; sometimes $ at the centre, and 2 at the circumference; capitula sometimes exclusively composed of ? or $ flowers, and then monoacious or dioecious. CALYX rarely foliaceous, generally scarious or membranous, sometimes cup-shaped, sometimes spread into a crown, entire toothed or laciniate ; sometimes divided into palese, or teeth or scales or awns ; sometimes reduced to capillary hairs or bristles, which are smooth or scabrid or ciliate or plumose, and forming a tuft, either sessile or stipitate ; finally, sometimes reduced to a thin circular cushion, or even entirely wanting. COROLLA epigynous, monopetalous, sometimes regular, tubular, 5-4-fid or -toothed, aestivation valvate ; sometimes irregular, either bilabiate or ligulate, eacb lobe furnished with two marginal nerves confluent in the tube. STAMENS 5-4, inserted on the corolla, and alternate with its divisions ; filaments inserted at the base of the tube, free above, rarely monadelphous, articulated towards the top ; anthers 2-celled, introrse, cohering into a tube which sheaths the style, very rarely free, usually prolonged into a terminal appendage, cells often terminating in a tail at the base. OVARY inferior, 1-celled, 1-ovuled, crowned with an annular disk which surrounds a concave nectary ; style filiform, undivided in the $ flowers, bifid in the 9 and g flowers ; branches of the style, commonly called stigmas, convex on the dorsal surface, flat on the inner, furnished toward their tops, or" outside, with short stiff hairs (collecting hairs), and traversed on tkfe inner edges by two narrow glan- dular (stigmatic) bands, constituting the true stigma ; style much shorter than the stamens before the opening of the flower, but rapidly growing at the period of fer- tilization, traversing the hollow cylinder formed by the anthers, and gathering, by means of the collecting hairs, the pollen destined to fertilize the newly opened neigh- bouring flowers. $ flowers furnished with stigmatic glands and collecting hairs ; the $ have stigmatic glands but no collecting hairs ; the $ have collecting hairs and no stigmatic glands; ovule straight, anatropous. ACHENE articulated on to the common receptacle, generally sessile, provided with a basilar or lateral areola, indicating its point of insertion, often prolonged in a beak to the top. SEED erect. EMBRYO straight, exalbuminous ; cotyledons plano-convex, very rarely convolute (Robinsonia) ; radicle inferior. 498 CXXII. COMPOSITE. SUB-ORDER I. IIGULIFLOE2E. Tribe I. CICHORACE^E. — Capitula formed of flowers with a ligulate irregular corolla (demi-florets), all 5 . Style with filiform branches, pubescent; stigmatic bands separate, and not half as long as the branches of the style. — Milky plants. Leaves alternate. PRINCIPAL GENERA. Andryala. Chondrilla. Picridium. Helminthia. Geropogon. Drepania. Hyoseris. Lapsana, &c. [For others, see Tribe XIII. of new classification, p. 505.] Cornflower. Fruit cut vertically (mag.). Cornflower. 2 Floret (mag.). Cornflower. Ray flower, neuter, with an irregular corolla and abortive pistil. Cornflower. Andrcecium (mag.). \ Cornflower. (Tubulifloral.) Inflorescence of each capitulum in- definite; collective inflorescence of the capitula definite. St.'_ Cornflower. Vertical section of common receptacle (mag.). Cornflower. Style and stigma (mag.). Cornflower. Corolla, androecium, style and stigma (mag.). Cornflower. Pistil (mag.). Cornflower. Floret cut vertically (mag.), showing the anther-tube traversed by the style. CXX1I. COMPOSITE. 499 Marigold. Marigold. Thistle. Capitulum seen from behind.