sggysy Gray's Lessons in Botany REVISES = CV> -;c- ■■.---:- •5CUVS -■-.. sbs&sb QK4 7 7 5 1887 f^-- :;jr>Ji. ^rr:.r:-/r;;f-/;:^ |:f:/e: ; !:-ri:jf:;/^Ji!^:!;: l;^*^1-/^^:;7!;;:^:-^;;: -;; : 3% ^Cj^tl partes ^tntfoersttg ®fts irook frias present*** bg Alan Weintraub NORTH CAROLINA STATE UNIVERSITY LIBRARIES SO 1257430 M fcoe This book is due on the date indicated below and is subject to an overdue fine as posted at the circulation desk. EXCEPTION: Date due will be earlier if this item is RECALLED. *£2 MAR 2&* DEC 2 7 2004 150M/01-92-941680 GKAY'S LESSONS IX BOTAXY REVISED EDITION THE ELEMENTS OF BOTANY FOR BEGINNERS AND FOR SCHOOLS By ASA GRAY NEW YORK:- CINCINNATI •:■ CHICAGO AMERICAN BOOK COMPANY GRAY'S BOTANICAL SERIES Gray's How Plants Grow Gray's How Plants Behave *Gray's Lessons in Botany Gray's Field, Forest, and Garden Botany (Flora only) *Gray's School and Field Book of Botany (Lessons and Flora) Gray's Manual of Botany. (Flora only) *Gray's Lessons and Manual of Botany Gray's Botanical Text-Book 1. Gray's Structural Botany II. Goodale's Physiological Botany Coulter's Manual of Botany of the Rocky Mountains Gray and Coulter's Text-Book of Western Botany EDITIONS OF 1 901 *Leavitt's Outlines of Botany (Based on Gray's Lessons) *Leavitt's Outlines of Botany with Flora (Outlines and Gray's Field, Forest, and Garden Botany) *Leavitt's Outlines and Gray's Manual Copyright, 1887, by Asa Gray REV. LESSONS w. p. a6 PREFACE. This volume takes the place of the author's Lessons in Botany and Vegetable Physiology, published over a quarter of a cen- tury ago. It is constructed on the same lines, and is a kind of new and much revised edition of that successful work. While in some respects more extended, it is also more concise and terse than its predecessor. This should the better fit it for its purpose now that competent teachers are common. They may in many cases develop paragraphs into lectures, and fully illustrate points which are barely, but it is hoped clearly, stated. Indeed, even for those without a teacher, it may be that a condensed is better than a diffuse exposition. The book is adapted to the higher schools, " How Plants Grow and Behave " being the " Botany for Young People and Common Schools." It is intended to ground beginners in Structural Botany and the principles of vegetable life, mainly as concerns Flowering or Phanerogamous plants, with which botanical instruction should always begin ; also to be a companion and interpreter to the Man- uals and Floras by which the student threads his flowery way to a clear knowledge of the surrounding vegetable creation. Such a book, like a grammar, must needs abound in technical words, which thus arrayed may seem formidable ; nevertheless, if rightly apprehended, this treatise should teach that the study of bot- any is not the learning of names and terms, but the acquisition of knowledge and ideas. No effort should be made to com- mit technical terms to memory. Any term used in describing a plant or explaining its structure can be Looked up vyhen it is wanted, and that should suffice. On the other hand, plans of IV PREFACE. structure, types, adaptations, and modifications, once understood, are not readily forgotten ; and they give meaning and interest to the technical terms used in explaining them. In these " Elements " naturally no mention has been made of certain terms and names which recent cryptogamically-minded botanists, with lack of proportion and just perspective, are en- deavoring to introduce into phanerogamous botany, and which are not needed nor appropriate, even in more advanced works, for the adequate recognition of the ascertained analogies and homologies. As this volume will be the grammar and dictionary to more than one or two Manuals, Floras, etc., the particular directions for pro- cedure which were given in the " First Lessons " are now relegated to those works themselves, which in their new editions will pro- vide the requisite explanations. On the other hand, in view of such extended use, the Glossary at the end of this book has been considerably enlarged. It will be found to include not merely the common terms of botanical description but also many which are unusual or obsolete ; yet any of them may now and then be encoun- tered. Moreover, no small number of the Latin and Greek words which form the whole or part of the commoner specific names are added to this Glossary, some in an Anglicized, others in their Latin form. This may be helpful to students with small Latin and less Greek, in catching the meaning of a botanical name or term. The illustrations in this volume are largely increased in number. They are mostly from the hand of Isaac Sprague. ' It happens that the title chosen for this book is that of the author's earliest publication, in the year 1836, of which copies are rarely seen ; so that no inconvenience is likely to arise from the present use of the name. ASA GRAY. Cambridge, Massachusetts, March, 1887. CONTENTS. Page SECTION I. INTRODUCTORY 9 SECTION II. FLAX AS A PATTERN PLANT 11 Growth from the Seed, Organs of Vegetation 11 Blossoming, Flower, &e 14 SECTION III. MORPHOLOGY OF SEEDLINGS 15 Germinating Maples 15 Cotyledons thickened, hypogaeous in germination 18 Store of Food external to the Embryo 20 Cotyledons as to number 22 Dicotyledonous and Polycotyledonous 23 Monocotyledonous 24 Simple-stemmed Plants 26 SECTION IV. GROWTH FROM BUDS; BRANCHING .... 27 Buds, situation and kinds 27 Vigorous vegetation from strong Buds 28 Arrangement of Branches 29 Non-developed, Latent, and Accessory Buds 30 Enumeration of kinds of Buds 31 Definite and Indefinite growth ; Deliquescent and Excurrent . 31 SECTION V. ROOTS 33 Primary and Secondary. Contrast between Stem and Root . 34 Fibrous and Fleshy Roots ; names of kinds 34 Anomalous Roots. Epiphytic and Parasitic Plants .... 36 Duration : Annuals, Biennials, Perennials 37 SECTION VI. STEMS 38 Those above Ground : kinds and modifications 39 Subterranean Stems and Branches 42 Rootstock, 42. Tuber, 44. Corm, 45. Bulb and Bulblets . . 4clo\v: the whole broad upper part is the inner face of one of the cotyledons; the minute nick at its base is the plumule. 4. Similar section through a seed turned edgewise, showing the thickness of the cotyledons, and the minute plumule between them, i. e. the minute laid on the Upper end of the caulicle. 12 A PATTERN PLANT. [SECTION 2. % «J- 11. On committing these seeds to moist and warm soil they soon sprout, i. e. germinate. The very short stem-part of the embryo is the first to grow. It lengthens, protrudes its root-end ; this turns downward, if not already pointing in that direction, and while it is lengthening a root forms at its point and grows downward into the ground. This root continues to grow on from its lower end, and thus insinuates itself and penetrates into the soil. The stem meanwhile is adding to its length throughout ; it erects itself, and, seeking the light, brings the seed up out of the ground. The mate- rials for this growth have been supplied by the cotyledons or seed-leaves, still in the seed : it was the store of nour- ishing material they held which gave them their thickish shape, so unlike that of ordinary leaves. Now, relieved of a part of this store of food, which has formed the growth by which they have been raised into the air and light, they appropriate the remain- der to their own growth. In enlarging they open and throw off the seed-husk ; they expand, diverge into a horizontal position, turn green, and thus become a pair of evident leaves, the first foliage of a tiny plant. This seedling, although diminutive and most simple, possesses and puts into use, all the Organs of Vegetation, namely, root, stem, and leaves, each in its proper element, — the root in the soil, the stem rising out of it, the leaves in the light and open air. It now draws in moisture and some 6 5 7 food-materials from the soil by its root, conveys this through the stem into the leaves, where these materials, along with other crude food which these imbibe from the air, are assimilated into vegetable matter, i. e. into the material for further growth. 12. Further Growth soon proceeds to the formation of new parts, — downward in the production of more root, or of branches of the main root, upward in the development of more stem and leaves. That from which a stem with its leaves is continued, or a new stem (i. e. branch) originated, is a Bud. The most conspicuous and familiar buds are those of most shrubs and trees, bearing buds formed in summer or autumn, to grow the following Fig. 5. Early Flax seedling ; stem (caulicle), root at lower end, expanded seed- leaves (cotyledons) at the other : minute hud (plumule) between these. 6. Same later; the bud developed into second pair of leaves, with hardly any stem-part be- low them; then into a third pair of leaves, raised on a short joint of stem ; and a fifth leaf also showing. 7. Same still older, with more leaves developed, but these singly (one after another), and with joints of stem between them. SECTION 2.] A PATTERN PLANT. 13 spring. But every such point for new growth may equally bear the name. When there is such a bud between the cotyledons in the seed or seedling it is called the Plumule. This is conspicuous enough in a beau (Fig. 29.), where the young leat'ol" the new growth looks like a little plume, whence the name, plumule. In flax-seed this is very minute indeed, but is discernible with a magnifier, and in the seedling it shows itself distinctly (Fig. 5, 6, 7). 13. As it grows it shapes itself into a second pair of leaves, which of course rests on a second joint of stem, although in this instance that remains too short to be well seen. Upon its summit appears the third pair of leaves, soon to be raised upon its proper joint of stem ; the next leaf is single, and is carried up still further upon its supporting joint of stem ; and so on. The root, meanwhile, continues to grow underground, not joint after joint, but continuously, from its lower end ; and commonly it before long multiplies itself by branches, which lengthen by the same continuous growth. But stems are built up by a succession of leaf-bearing growths, such as are strongly marked in a reed or corn- stalk, and less so in such an herb as Flax. The word "joint " is ambigu- ous : it may mean either the portion between successive leaves, or their junction, where the leaves are at- tached. For precision, therefore, the place where the leaf or leaves are borne is called a Node, and the naked interval between two nodes, an Internode. 14. In this way a simple stem with its garniture of leaves is de- veloped from the seed. But besides this direct continuation, buds may form and develop into lateral stems, that is, into branches, from any node. The proper origin of branches is from the Axil of a leaf, i. e. the angle between leaf and stem on the upper side ; and branches may again branch, so building up the herb, shrub, or tree. But sooner or later, and without long delay in an annual like Flax, instead of this continuance of mere vegetation, reproduction is prepared for by FlO. S. Upper part of Flax-plant in blossom. 14 A PATTERN PLANT. [SECTION 2. 15. Blossoming. In Flax the flowers make their appearance at the end of the stem and branches. The growth, which otherwise might con- tinue them farther or indefinitely, now takes the form of blossom, and is subservient to the production of seed. 16. The Flower of Flax consists, first, of five small green leaves, crowded into a circle: this is the Calyx, or flower-cup. When its sepa- rate leaves are referred to they are called Sepals, a name which distin- guishes them from foliage-leaves on the one hand, and from petals on the other. Then come five delicate and colored leaves (in the Flax, blue), which form the Corolla, and its leaves are Petals ; then a circle of organs, in which all likeness to leaves is lost, consisting of slender stalks with a knob at summit, the Stamens; and lastly, in the centre, the rounded body, which becomes a pod, surmounted by five slender or stalk-like bodies. This, all together, is the Pistil. The lower part of it, which is to contain the seeds, is the Ovary; the slender organs surmounting this are Styles; the knob borne on the apex of each style is a Stigma. Going back to the sta- mens, these are of two parts, viz. the stalk, called Filament, and the body it bears, the Anther. Anthers are filled with Pollen, a powdery sub- stance made up of minute grains. 17- The pollen shed from the anthers when they open falls upon or is conveyed to the stigmas ; then the pollen-grains set up a kind of growth (to be discerned only by aid of a good microscope), which penetrates the style : this growth takes the form of a thread more delicate than the finest spider's web, and reaches the bodies which are 1o become seeds (Ovules they are called until this change occurs) ; these, touched by this influence, are in- cited to a new growth within, which becomes an embryo. So, as the ovary ripens into the seed-pod or capsule (Fig. 1, etc.) containing seeds, each seed enclosing a rudimentary new plantlet, the round of this vegetable existence is completed. Fig. 9. Flax-flowers about natural size. 10. Section of a flower moderately enlarged, showing a part of the petals and stamens, all five styles, and a section of ovary with two ovules or rudimentary seeds. SECTION 3.] SEEDLINGS. 15 Section HI. MORPHOLOGY OF SEEDLINGS. 18. Having obtained a general idea of the growth and parts of a pha- nerogamous plant from the common Flax of the field, the seeds and seed- lings of other familiar plants may be taken up, and their variations from the assumed pattern examined. 19. Germinating Maples arc excellent to begin with, the parts being so much larger than in Flax that a common magnifying glass, although convenient, is hardly necessary. The only disadvantage is that fresh seeds are not readily to be had at all seasons. 20. The seeds of Sugar Maple ripen at the end of summer, and germi- nate in early spring. The em- bryo fills the whole seed, in />"""^Jk /^^i— , which it is nicely packed ; and /^?\ uf^^XV (C\\ the nature of the parts is ob- \(((()jj v( V> \\ ^ofc^j vious even before growth begins. \t^g? «■ -^— — II There is a stemlet (caulicle) and u 12 v 13 a pair of long and narrow seed- leaves (cotyledons), doubled up and coiled, green even in the seed, and in germination at once unfolding into the first pair of foliage-leaves, though of shape quite unlike those that follow. 21. Red Maple seeds are ripe and ready to germinate at the beginning o£ summer, and are therefore more convenient for study. The cotyledons are crumpled in the seed, and not easy to straighten out until they unfold them- selves in germination. The story of their development into the seedling is told by the accompanying Fig. 14-20 ; and that of Sugar Maple is closely similar. No plumule or bud appears in the embryo of these two Maples until the seed-leaves have nearly attained their full growth and are acting as foliage-leaves, and until a root is formed below. There is no great store of nourishment in these thin cotyledons; so further growth has to wait until the root and seed-leaves have collected and elaborated sufficient ma- terial for the formation of the second internode and its pair of leaves, which lending their help the third pair is more promptly produced, and so on. 22. Some change in the plan comes with the Silver or Soft White Maple. (Fig. 21-25). This blossoms in earliest spring, and it drops its large and ripened keys only a few weeks later. Its cotyledons have not at all the appearance of leaves ; they are short and broad, and (as there is no room to be saved by folding) they are straight, except a small fold at the top, — a vestige of the habit of Maples in general. Their unusual thickness is due Fio. 11. Embryo of Sugar Maple, cut through lengthwise and taken out of the seed. 12, 13. Whole embryo of same just beginning to grow; a, the stemlet or caulicle. which in 13 has considerably lengthened. 10 SEEDLINGS. [SECTION 3. to the large store of nutritive matter they contain, and this prevents their developing into actual leaves. Correspondingly, their caulicle does not lengthen to elevate them above the surface of the soil ; the growth below the cotyledons is nearly all of root. It is the little plumule or bud between them which makes the upward growth, and which, being well fed by the cotyledons, rapidly develops the next pair of leaves and raises them upon a long internode, and so on. The cotyledons all the while remain below, in the husk of the fruit and seed, and perish when they have yielded up the store of food which they contained. 23. So, even in plants so much alike as Maples, there is considerable difference in the amount of food stored up in the cotyledons by which the growth is to be made ; and there are corresponding differences in the ger- Fig. 14. One of the pair of keys or winged fruits of Red Maple; the seed-bear- ing portion cut open to show the seed. 15. Seed enlarged, and divided to show the crumpled embryo which fills it. 16. Embryo taken out and partly opened. 17. Embryo which has unfolded in early stage of germination and begun to grow. 18. Seedling with next joint of stem and leaves apparent; and 19 with these parts full-grown, and bud at apex for further growth. 20. Seedling with another joint of stem and pair of leaves. SECTION 3.] SEEDLINGS. 17 urination. The larger the supply to draw upon, the stronger the growth, and the quicker the formation of root below and of stein and leaves above. This deposit of food thickens the cotyledons, and renders them less and less leaf-like in proportion to its amount. 2t. Examples of Embryos with thickened Cotyledons. In the Pumpkin and Squash (Kg. 20, 27), t he cotyledons are well supplied with nourishing matter, as their sweet taste demonstrates. Still, they are flat and not very thick. In germination this store is promptly utilized in the devel- opment of the caulicle to twenty or thirty times its length in the seed, and to corresponding thickness, in the formation of a cluster of roots at its lower end, and the early pro- duction of the incipient plumule ; also in their own growth into effi- cient green leaves. The case of our common Bean (Phaseolus vul- garis, Fig. 28-30) is nearly the same, except that the cotyledons are much more gorged ; so that, although carried up into the air and light upon the lengthening caulicle, and there acquiring a green color, they never expand into useful leaves. Instead of this, they nourish into rapid growth the plumule, which is plainly visible in the seed, as a pair of incipient leaves; and these form the first actual foliage. 25. Very similar is the germination of the Beech (Fig. 31-33), except that the caulicle lengthens less, hardly raising the cotyledons out of the ground. Nothing would be gained by elevating them, as they never grow out into efficient leaves; but the joint of stem belonging to the plumule lengthens well, carrying up its pair of real foliage-leaves. 2G. It is nearly the same in the Bean of the Old World (Vicia Faba, here called Horse Bean and Windsor Bean) : the caulicle lengthens very little, does not undertake to elevate the heavy seed, which is left below or Fig. 21. Fruit (one key) of Silver Maple, Acer dasyearpum, of natural size, the seed-bearing portion divided to show the seed. 22. Embryo of the seed taken out. 23. Same opened out, to show the thick cotyledons ami the little plumule or bud between them. 24. Germination of Silver Maple, natural size; merely the base of the fruit, containing the seed, is shown. 25. Embryo of same, taken out of the husk; upper part of growing stem cut off, for want of room. •?- 18 SEEDLINGS. [SECTION 3. upon the surface of the soil, the flat but thick cotyledous remaiuiug in it, and supplying food for the growth of the root below and the plumule tbove. In its near relative, the Pea (Fig. 34, 35), this use of cotyledous for storage only is most completely carried out. For they are thickened to the utmost, even into hemispheres ; the caulicle does not lengthen at all ; merely sends out roots from the lower end, and develops its strong plu- mule from the upper, the seed remaining unmoved underground. That is, in technical language, the germination is hypogeeous. 27' There is sufficient nourishment in the cotyledons of a pea to make a very considerable growth before any actual foliage is required. So it is the stem-portion of the plumule which is at first conspicuous and strong- growing. Here, as seen in Fig. 35, its lower nodes bear each a useless leaf-scale instead of an efficient leaf, and only the later ones bear leaves fitted for foliage. Fig. 26. Embryo of Pumpkin-seed, partly opened. 27. Young seedling of same. Fig. 28. Embryo of Common Bean (Phaseolus vulgaris): caulicle bent down over edge of cotyledons. 29. Same germinating : caulicle well lengthened and root beginning; thick cotyledons partly spreading; and plumule (pair of leaves) growing between them. 30. Same, older, with plumule developed into internode and pair of leaves. SECTION 3.] SEEDLINGS. 19 28. This hypogtvous germination is exemplified on a larger scale by the Oak (Fig. 36, '67) and Horse-chestnut (Fig. 38, 39); but in these the downward growth is wholly a stout tap-root. It is not the caulicle; for this lengthens hardly any. Indeed, the earliest growth which carries the very short caulicle out of the shell comes from the formation of foot- stalks to the cotyledons; above these develops the strong plumule, below grows the stout root. The growth is at first entirely, for a long time Fig. 31. A Beech-nut, cut across. 32. Beginning germination of the Beech, showing the plumule growing before the cotyledons have opened or the root has scarcely formed. 33. The same, a little later, with the plumule-leaves developing, and elevated on a long internode. FlQ. 34. Embryo of Pea, i. e. a pea with the coats removed; the short and thick caulicle presented to view. 35. Same in advanced germination : the plumule has developed four or five internodes, bearing single leaves ; but the first and sec- ond leaves are mere scales, the third begins to serve as foliage ; the next more so. 20 SEEDLINGS. [SECTION 3. mainly, at the expense of the great store of food in the cotyledons. These, after serving their purpose, decay and fall away. 29. Such thick cotyledons never separate; indeed, they sometimes grow together by some part of their contiguous faces ; so that the germination seems to proceed from a solid bulb-like mass. This is the case in a horse-chestnut. 30. Germinating Embryo supplied by its own Store of Nourishment, i. e. the store in the cotyledons. This is so in all the illustrations thus far, essentially so even in the Flax. This nourishment was supplied by the mother plant to the ovule and seed, and thence taken into the embryo during its growth. Such embryos, filling the whole seed, are comparatively large and strong, and vigorous in germination in proportion to the amount of their growth while connected with the parent plant. 31. Germinating Embryo supplied from a Deposit outside of It- self. This is as common as the other mode; and it occurs in all degrees. Fig. 36. Half of an acorn, cut lengthwise, filled by the very thick cotyledons, the base of which encloses the minute caulicie. 37. Oak-seedling. Fig. 38. Half of a horse-chestnut, similarly cut ; the caulicie is curved down on the side of one of the thick cotyledons. 39. Horse-chestnut in germination; foot- stalks are formed to the cotyledons, pushing out in their lengthening the growing parts. SECTION 3.] SEEDLINGS. 21 Some seeds have very little of this deposit, but a comparatively large em- bryo, with its parts more or less developed and recognizable. In others this deposit tonus the main hulk, of the seed, and the embryo is small or minute, and comparatively rudimentary. The following illustrations exem- plify these various grades. When an embryo in a seed is thus surrounded by a white substance, it was natural to liken the latter to the white of an egg, and the embryo or germ to the yolk. So the matter around or by the side of the embryo was called the Albumen, i. e. the white of the seed. The analogy is not very good ; and to avoid ambiguity some botan- ists call it the Endosperm. As that means in English merely the inwards of a seed, the new name is little better than the old one ; and, since we do not change names in botany except when it cannot be avoided, this name of albu- men is generally kept up. A seed with such a deposit is ulbuminous, one with none is exal- bumi/iuus. 32. The Albumen forms the main bulk of the seed in wheat, maize, rice, buckwheat, and the like. It is the floury part of the seed. Also of the cocoa-nut, of coffee (where it is dense and hard), etc. ; while in peas, beans, almonds, and in most edible nuts, the store of food, al- though essentially the same in nature and in use, is in the embryo itself, aud therefore is not counted as anything to be separately named. In botli forms this concentrated food for the germinating plant is food also for man and for animals. 33. For an albuminous seed with a well-developed embryo, the com- mon Morning Glory (Ipomoea purpurea, Fig. 40-43) is a convenient exam- ple, being easy and prompt to grow, and having all the parts well apparent. The seeds (duly soaked for examination) and the germination should be compared with those of Sugar and Red Maple (19-21). The only essen- tia! difference is that here the embryo is surrounded by and crumpled up in the albumen. This substance, which is pulpy or mucilaginous in fresh and young seeds, hardens as the seed ripens, but becomes again pulpy in germination; and, as it liquifies, the thin cotyledons absorb it by their Fig. 40. Seed of Momiuu' Glory divided, moderately magnified; shows a longi- tudinal aection through the centre of the embryo as it lies crumpled in the albu- men. 41. Embryo taken out whole and unfolded; the broad and very thin cotyledons notched al summit ; the caulicle below. 4-J. Early state of germinar tion. 43. Same, more advanced; caulicle or primary stem, cotyledons or seed- leaves, and below, the root, wt-11 developed. 22 SEEDLINGS. [section 3. whole surface. Tt supplements the nutritive matter contained in the embryo. Both together form no large store, but sufficient for establishing the seedling, with tiny root, stem, and pair of leaves for initiating its independent growth; which in due time proceeds as in Pig. 44, 45. 34. Smaller embryos, less developed in the seed, are more dependent upon the extraneous supply of food. The figures 46-53 illustrate four grades in this respect. The smallest, that of the Peony, is still large enough to be seen with a hand magnifying glass, and even its cotyledons may be discerned by the aid of a simple stage microscope. 35. The broad cotyledons of Mirabilis, or Tour-o'clock (Fig. 52, 53), with the slender caulicle almost encircle and enclose the floury albumen, instead of being enclosed in it, as in the other illustrations. Evidently here the germinating embryo is principally fed by one of the leaf-like coty- ledons, the other being out of contact with the supply. In the embryo of Abronia (Fig. 54, 55), a near relative of Mirabilis, there is a singular modification ; one cotyledon is almost wanting, being reduced to a rudi- ment, leaving it for the other to do the work. This leads to the question of the 36. Number of Cotyledons. In all the preceding illustrations, the embryo, however different in shape and degree of development, is evidently Fig. 44. Seedling of Morning Glory more advanced (root cut away); cotyledons well developed into foliage-leaves: succeeding internode and leaf well developed, and the next forming. 45. Seedling more advanced; reduced to much below natural size. SECTION 3.] SEEDLINGS. 23 constructed upon one and the same plan, namely, that of two leaves on a caulicle or initial .stem, — a plan which is obvious even when one cotyledon becomes very much smaller than the other, as in the rare instance of Abro- nia (Fig. 54, 55). In other words, the embryos so far examined are all 37. Dicotyledonous, that is, two-cotyledoned. Plants which are thus similar in the plan of the embryo agree likewise in the general structure of 46 48 60 52 their stems, leaves, and blossoms; and thus form a class, named from their embryo Dicotylkdones, or in English, Dicotyledonous Plants. So long a name being inconvenient, it may be shortened into Dicotyls. 38. Polycotyledonous is a name employed for the less usual case in which there are more than two cotyledons. The Pine is the most familiar case. This occurs in all Pines, the number of cotyledons varying from three to twelve ; in Fig. 56, 57 they are six Note that they are all on the same level, that is, belong to the same node, so as to form a circle or whorl at the summit of the caulicle. When there are only three cotyledons, they divide the space equally, are one third of the circle apart. When only two they are 180° apart, that is, are opposite. 39. The case of three or more cotyledons, which is constant in rinos and in some of their relatives (but not in all of them), is occasional among Dicotyls. And the polycotyledonous is only a variation of the dicotyledonous type, — a difference in the number of leaves in the whorl ; for a pair is a whorl reduced to two members. Some suppose that there arc really only FlO. !»">. Section of a seed of a Peony, showing a very small embryo in the albumen, near one end. 47. This embryo detached, and more magnified. Fig. 48. Section of a seed of Barberry, showing the straight embryo in the middle of the albumen. 49. Its embryo detached. Fig. 50. Section of a Potato-seed, showing the embryo coiled in the albumen. 51. Its embryo detached. Fig. 52. Section of the seed of Mirabilis or Four-o'clock, showing the embryo coiled round the outside of the albumen. 53. Embryo detached; showing the very broad and leal' like cotyledons, applied face to fate, and the pair incurved Fie 54. Embryo of Abrouia uiubellata; one of the cotyledons very small. do. Same straightened out. 24 SEEDLINGS. [SECTION 3 68 two cotyledons even in a Pine-embryo, but these divided or split up con- genitally so as to imitate a greater number. But as leaves are often in whorls on ordinary stems, they may be so at the very beginning. 40. Monocotyledonous (meaning with single cotyledon) is the name of the one-coty- ledoned sort of embryo. This goes along with peculiarities in stem, leaves, and flowers ; which all together associate such plants into a great class, called Monocotyledonous Plants, or, for shortness, Monocotyls. It means merely that the leaves are alternate from the very first. 41. In Iris (Fig. 58, 59) the embryo in the seed is a small cylinder at one end of the mass of the albumen, with no apparent dis- tinction of parts. The end which almost touches the seed-coat is caulicle ; the other end belongs to the solitary cotyledon. In germination the whole lengthens (but mainly the cotyledon) only enough to push the proximate end fairly out of the seed : from this end the root is formed ; and from a little higher the plumule later emerges. It would appear, therefore, that the cotyledon answers to a minute leaf rolled up, and that a chink through which the plumule grows out is a part of the inrolled edges. The embryo of Indian Corn shows these parts on a larger scale and in a more open state (Fig. 66- 68). There, in the seed, the cotyledon remains, imbibing nourishment from the softened albu- men, and transmitting it to the growing root below and new-forming leaves above. 42. The general plan is the same in the Onion (Fig. 60-65), but with a striking difference. The embryo is long, and coiled in the albumen of the seed. To ordinary examination it shows no distinction of parts. But germination plainly shows that all except the lower end of it is cotyledon. For after it has lengthened into a long thread, the chink from which the Fig. 56. Section of a Pine-seed, showing its polyeotyledonous embryo in the centre of the albumen; moderately magnified. 57. Seedling of same, showing the freshly expanded six cotyledons in a whorl, and the plumule just appearing. Fig. 58. Section of a seed of the Iris, or Flower-de-Luee, enlarged, showing its small embryo in the albumen, near the bottom. 59. A germinating seedling of the same, its plumule developed into the first four leaves (alternate), the first one rudimentary; the cotyledon remains in the seed. Fig. 60. Section of an Onion-seed, showing the slender and roiled embryo in the albumen ; moderately magnified. 61. Seed of same in early germination. SECTION 3.j SEEDLINGS. 25 plumule in time emerges is seen at the base, or near it ; so the caulicle is 62 63 64 extremely short, and docs not elongate, but sends out from its base a simple root, and afterwards others in a cluster. Not only does the cotyledon lengthen enormously in the seedling, but (un- like that of Iris, Indian Corn, and a Fig. 62. Germinating Onion, more advanced; the chink at base of cotyledon opening for the protrusion of the plumule, consisting of a thread-shaped leaf. 63. Section of base of Fig. 62, showing plumule enclosed. 64. Section of same later ; plumule emerging. <">.">. Laterstageof 62; upper* part cut off. t*>r>. A grain of Indian Corn, flatwise, cut away a little, so as to show the embryo, lying on the albumen, which makes the principal hulk of the seed. 67. A grain cut through the middle in the opposite direction, dividing the embryo through its thick cotyle- don and its plumule, the latter consisting Of tWO leaves, one enclosing the other. 68. The embryo, taken out whole: the thick mass is the cotyledon; the narrow body partly enclosed by it is the plumule; the little projection at its base is the very short radicle enclosed in the sheathing base of the Brst leaf of the plumule. Pio. ''''a Grain of Indian Corn in germination ; the ascending sprout is the first hat' of the plumule, enclosing the younger leaves within; at its has.' the primary root has broken through. 7<>. The same, advanced: the second and third leaves developing, while the sheathing Brst leaf does not further develop. 26 SEEDLINGS. [SECTION 3. the cereal grains) it raises the comparatively light seed into the air, the tip still remaining in the seed and feeding upon the albumen. When this food is exhausted and the seedling is well es- tablished in the soil, the upper end decays and the emptied husk of the seed falls away. 43. In Maize or In- dian Corn (Fig. 66-70), the embryo is more de- veloped in the seed, and its parts can be made out. It lies against the starchy albumen, but is not enclosed therein. The larger part of it is the cotyledon, thickish, its edges involute, and its back in contact with the albumen ; partly enclosed by it is the well-devel- oped plumule or bud which is to grow. For the cotyledon remains in the seed to fulfil its office of imbibing nourishment from the softened albu- men, which it conveys to the growing sprout ; the part of this sprout which is visible is the first leaf of the plumule rolled up into a sheath and enclosing the rudiments of the succeeding leaves, at the base enclosing even the minute caulicle. In germination the first leaf of the plumule develops only as a sort of sheath, protecting the tender parts within; the second and the third form the first foliage. The caulicle never lengthens : the first root, which is formed at its lower end, or from any part of it, has to break through the enclosing sheath ; and succeeding roots soon spring from all or any of the nodes of the plumule. 44. Simple-stemmed Plants are thus built up, by the continuous pro- duction of one leaf-bearing portion of stem from the summit of the preced- ing one, beginning with the initial stem (or caulicle) in the embryo. Some Dicotyls and many Monocotyls develop only in this single line of growth (as to parts above ground) until the flowering state is approached. For some examples, see Cycas (Fig. 71, front, at the left) ; a tall Yucca or Spanish Bayonet, and two Cocoa-nut Palms behind ; at the right, a group of Sugar- canes, and a Banana behind. Fig, 71. Simple-stemmed vegetation, SECTION 4. J BUDS. 27 Section IV. GROWTH FROM BUDS: BRANCHING, 45. Most plants increase the amount of their vegetation by blanching, that is, bj producing lateral shoots. 46. Roots branch from any pari and usually without definite order. Stems normally give rise to branches only at definite points, namely, at the nodes, and there only from the axils of leaves. 47. Buds (Fig. 72, 73). Every incipient shoot is a Bud (12). A stem continues its growth by its terminal bud; it branches by the forma- tion and development of lateral bads. As normal lateral buds occupy the axils of leaves, they are called axillary buds. As leaves are symmetrically arranged on the stem, the buds in their axils and the branches into which axillary buds grow partake of this symmetry. The most conspicuous buds are the scaly winter- buds of most shrubs and trees of temperate and cold climates ; but the name belongs as well to the forming shoot or branch of any herb. 48. The Terminal Bud, in the most general sense, may be said to exist in the embryo, — as cotyledons, or the cotyledons and plumule, — and to crown each successive growth of the simple stem so long as the summit is capable of growth. The whole ascending growth of the Palm, Cy- cas, and the like (such as in Fig. 71) is from a terminal bud. Branches, being repetitions of the main stem and growing in the same way, are also lengthened by terminal buds. Those of Horse-chestnut, Hickory, Maples, and such trees, being the resting Jmds of winter, are conspicu- ous by their protective covering of scales. These bud-scales, as will hereafter be shown, are themselves a kind of leaves. 49. Axillary Buds were formed on these annual shoots early in the summer. Occasion- ally they grow the same season into branches; at least, some of them are pretty sure to do so whenever the growing terminal bud at the end of the shoot is injured or destroyed. Otherwise they may lie dormant until the following spring. In many trees or shrubs these axillary buds do not show themselves until Bpring ; but if searched for. they may be detected, though of small size, hidden under the bark. Sometimes, although early Fig. 72. Shoot of Horse-chestnut, ..four year's growth, taken in autumn after the leaves haw fallen; Bhowtag the large terminal mid and (smaller axillary buds. Fig. 73. Similar shoot of Shagbark Hickory, Carya alba. 28 BUDS. [SECTION 4. formed, they are concealed all summer long under the base of the leaf-stalk, which is then hollowed out into a sort of inverted cup, like a candle- extinguisher, to cover them ; as in the Locust, the Yellow-wood, or more strikingly in the Button- wood or Plane-tree (Fig. 74). 50. The leaf -scars, so conspicuous in Fig. 72, 73, under each axillary bud, mark the place where the stalk of the subtending leaf was attached until it fell in autumn. 51. Scaly Buds, which are well represented in Fig. 72, 73, commonly belong to trees and shrubs of countries in which growth is suspended dur- ing winter. The scaly coverings protect the tender young parts beneath, not so much by keeping out the cold, which of course would penetrate the bud in time, as by shielding the interior from the effects of sudden changes. There are all gradations between these and 52. Naked Buds, in which these scales are inconspicuous or wanting, as in most herbs, at least above ground, and most tropical trees and shrubs. But nearly related plants of the same climate may differ widely in this re- spect. Rhododendrons have strong and scaly winter-buds ; while in Kalmia they are naked. One species of Viburnum, the Hobble-bush, has com- pletely naked buds, what would be a pair of scales developing into the first leaves in spring ; while another (the Snowball) has conspicuous scaly buds. 53. Vigor of Vegetation from strong buds. Large and strong buds, like those of the Horse-chestnut, Hickory, and the like, contain several leaves, or pairs of leaves, ready formed, folded and packed away in small compass, just as the seed-leaves of a strong embryo are packed away in the seed : they may even contain all the blossoms of the ensuing season, plainly visible as small buds. And the stems upon which these buds rest are filled with abundant nourishment, which was deposited the summer before in the Fig. 74. An axillary bud, concealed under the hollowed base of the leafstalk, in Buttonwood or Plane-tree. SECTION 4.] BUDS. 29 wood or in the bark. Under the surface of the soil, or on it covered with the fallen leaves of autumn, similar strong buds of our perennial herbs may be found; while beneath are thick roots, rootstocks, or tubers, charged with a great store of nourishment for I heir use. This explains how it is t hat vegetation from such buds shoots forth so vigorously in the spring of the year, and clothes the bare and lately frozen surface of the soil, as well as the naked boughs of trees, very promptly with a covering of fresh green, and often with brilliant blossoms. Everything was prepared, and even formed, beforehand: the short, joints of stem in the bud have only to lengthen, and to separate the leaves from each other so that they may un- fold and grow. Only a small part of the vegetation of the season conies directly from the seed, and none of the earliest vernal vegetation. This is all from buds which have lived through the winter. 54. The Arrangement of Branches, being that of axillary buds, answers to that of the leaves. Now leaves principally arc either opposite or alternate. Leaves are opposite when there are two from the same joint of stem, as in Maples (Fig. 20), the two being on opposite sides of the stem ; and so the axillary buds and branches are opposite, as in Fig. 75. Leaves are alter- nate when there is only one from each joint of stem, as in the Oak, Lime- tree, Poplar, Button-wood (Fig. 71), Morning-Glory (Fig. 45, — not counting the seed-leaves, which of course are opposite, there being a pair of them) ; also in Indian Corn (Fig. 70), and Iris (Fig. 59). Consequently the axillary buds are also alternate, as in Hickory (Fig. 73) ; and the branches ihey form alternate, — making a different kind of spray from the other mode, one branch shooting on one side of the stem and the next on some other. For in the alternate arrangement no leaf is on the same side of the stem as the one next above or next below it. 55. But the symmetry of branches (unlike that of the leaves) is rarely complete. This is due to several causes, and most commonly to the 56. Non-development of buds. It never happens that all the buds grow. If they did, there might be as many branches in any year as there were leaves the year before. And of those which do begin to grow, a large portion perish, sooner or later, for want of nourishment, or for want of light, or because those which first begin to grow have an advantage, which they are apt to keep, taking to themselves the nourishment of the stem, and starving the weaker buds. In the Borse-chestnul (Fig 78), Hickory (Fig. 73), Magnolia, and most other trees with large scaly buds, the terminal bud is the strongest, and has the advantage in growth; and next in strength are the upper axillary buds: while the former continues the shoot of the last year, some of the latter give rise to branches, and the rest fail to grow. In the Lilac also (Fig. 7"> >, the uppermost axillary buds are stronger than the lower ; but the terminal bud rarely appears at all; in its place the uppermost pair of axillary buds grow, and so each stem branches every year into two, — making a repeatedly two-forked ramification, as in Fig. 76. 30 BUDS. [SECTION 4. 57. Latent Buds. Axillary buds that do not grow at the proper season, and especially those which make no appearance externally, may long remain latent, and at length upon a favorable occasion start into growth, so form- ing branches apparently out of place as they are out of time. The new shoots seen springing directly out of large steins may sometimes orig- inate from such latent buds, which have preserved their life for years. But commonly these arise from 58. Adventitious Buds. These are buds which certain shrubs and trees produce anywhere on the sur- face of the wood, especially where it has been injured. They give rise to the slender twigs which often feather the sides of great branches of our American Elms. They some- times form on the root, which natu- rally is destitute of buds ; they are even found upon some leaves ; and they are sure to appear on the trunks and roots of Willows, Pop- lars, and Chestnuts, when these are wounded or mutilated. Indeed Osier- Willows are pollarded, or cut off, from time to time, by the culti- vator, for the purpose of produc- ing a crop of slender adventitious twigs, suitable for basket-work. Such branches, being altogether irregular, of course interfere with the natural symmetry of the tree. Another cause of irregularity, in certain trees and shrubs, is the formation of what are called 59. Accessory or Supernumerary- Buds. There are cases where two, three, or more buds spring from the axil of a leaf, instead of the single one which is or- dinarily found there. Sometimes they are placed one over the other, as in the Aris- tolochia or Pipe-Vine, and in the Tartarean Honeysuckle ("Fig. 77) ; also in the Honey-Locust, and in the Walnut and Butternut (Fig. 78), where Fig. 75. Shoot of Lilac, with winter buds ; the two uppermost axillary ones strong; the terminal not developed. 76. Forking ramification of Lilac; reduced in size. Fio. 77. Tartarean Honeysuckle, with three accessory buds in each axil. SECTION 4. J BUDS. 31 the upper supernumerary bud is a good way out of the axil and above the others Ami this is here stronger than the others, and grows into a branch which is considerably out of the axil, while the Lower and smaller ones commonly do not grow at all. In other casts three bnds stand side by side in the axil, as in the Hawthorn, and the Red Maple (Fig. 79.) If these were all to grow into branches, they would stifle each other. Bui some of them are commonly flower-buds : iu the Red Maple, only the middle one is a leaf-bud, and it docs not grow until after those on each side of it have expanded the blossoms they contain. GO. Sorts of Buds. It maybe useful to enumerate the kinds of buds which have been described or men- tioned. They are Terminal, when they occupy the summit of (or ter- minate) a stem, Lateral, when they are borne on the side of a stem ; of which the regular kind is the Axillary, situated in the axil of a leaf. These are Accessory or Supernumerary, when they are in addition to the normal solitary bud; and these are Collateral, when side by side ; Superposed, when one above another; Extra-axillary, when they appear above the axil, as some do when superposed, and as occasionally is the case when single. Naked buds ; those which have no protecting scales. Scaly buds; those which have protecting scales, which are altered leaves or bases of leaves. Leaf-buds, contain or give rise to leaves, and develop into a leafy shoot. Flower -buds, contain or consist of blossoms, and no leaves. Mixed buds, contain both leaves and blossoms. 61. Definite annual Growth from winter buds is marked in most of the shoots from strong buds, such as those of the Horse-chestnul and Hickory (Fig. 72, 73). Such a bud generally contains, already formed in miniature, all or a great part of the leaves and joints of stem it is to pro- duce, makes its whole growth in length in the course of a few weeks, or sometimes even in a few days, and then forms and ripens its buds for the next year's similar growth. 62. Indefinite annual Growth, on the other hand, is well marked in such trees or shrubs as the Honey-Locust, Sumac, and iu sterile shoots of Pio. 78. Butternut branch, with accessory buds, the uppermost above the axil. Fig. 79. Red-Maple branch, with accessory buds placed side by side. The an- nular lines toward the base in this and in Fig. 72 are scars of the bud-scales, and indicate the place of the winter-bud of the preceding year. 32 BUDS. [SECTION 4. the "Rose, Blackberry, and "Raspberry. That is, these shoots are apt to grow all summer long, until stopped by the frosts of autumn or some other cause. Consequently they form and ripen no terminal bud protected by scales, and the upper axillary buds are produced so late in the season that they have no time to mature, nor has their wood time to solidify and ripen. Such stems therefore commonly die back from the top in winter, or at least all their upper buds are small and feeble ; so the growth of the suc- ceeding year takes place mainly from the lower axillary buds, which are more mature. 63. Deliquescent and Excurrent Growth. In the former case, and wherever axillary buds take the lead, there is, of course, no single main stem, continued year after year in a direct line, but the trunk is soon lost in the branches. Trees so formed commonly have rounded or spreading tops. Of such trees with deliquescent stems, — that is, with the trunk dissolved, as it were, into the successively divided branches, — the common American Elm (Fig. 80) is a good illustration. 64. On the other hand, the main stem of Firs and Spruces, unless de- stroyed by some injury, is carried on in a direct line throughout the whole growth of the tree, by the development year after year of a terminal bud : this forms a single, uninterrupted shaft, — an excurrent trunk, which can- not be confounded with the branches that proceed from it. Of such spiry or spire-shaped trees, the Firs or Spruces are characteristic and familiar examples There are all gradations between the two modes. Eia. 80. An American Elm, with Spruce-trees, and ou the left Arbor Vitae. SECTION 5.] ROOTS. 33 Section V. HOOTS. 65. It is a property of stems to produce roots. Stems do not spring from roots in ordinary cases, as is generally thought, but roots from Btems. When perennial herbs arise from the ground, as they do at spring-time, they rise from subterranean steins. 66. The Primary Root is a downward growth from the root-end of the caulicle, that is, of the initial stem of the embryo (Fig. 5-7, 81). If it goes on to grow it makes a main or tap-root, as in Fig. 37, etc. Some plants keep this main root throughout their whole life, and send off only small side branches ; as in the Carrot and Radish : and in various trees, like the Oak, it takes the lead of the side-branches for several years, unless accidentally injured, as a strong tap- root. But commonly the main root divides off very soon, aud is lost in the brandies. Multiple primary roots now ami then occur, as in the seedling of Pumpkin (Fig. "27), where a cluster is formed even at the first, from the root -end of the caulicle. G7. Secondary Roots are those which arise from other parts of the stem. Any part of the stem may produce them, but they most readily come from the nodes. As a general rule they naturally spring, or may be made to spring, from almost any young stem, when placed in favorable circumstances, — that is, when placed in the soil, or otherwise supplied with moisture and screened from the light. For the special tendency of the root is to avoid the light, seek moisture, and therefore to bury itself in the soil. Propagation by division, which is so common and so very important in cultivation, depends upon the proclivity of steins to strike root. Stems or branches which remain underground give out roots as freely as roots themselves give oil' branches. Siems which creep on the ground most commonly root at the joints; so will most branches when bent to the ground, as in propagation by layer- ing ; and propagation by cuttings equally depends upon the tendency of the cut cud of a shoot to produce roots. Thus, a piece of a plant which has stem and leaves, cither developed or in the bud, may be made to produce roots, and so become an independent plant. Fig. 81. Seedling Maple, ofthe natural size; therool well supplied with root-hairs. here large enough to in- Been by the naked eye. 82. Lower end <>f tins root.nmgni- ned, the root seen just as root-hairs are beginning to form a little behind the Up. 3 34 ROOTS. [SECTION 5. 68. Contrast between Stem and Root. Stems are aso ending axes; roots are descending axes. Steins grow by the successive development of iuternodes (13), one alter another, each leaf-bearing at its summit (or node) ; so that it is of the essen- tial nature of a stem to bear leaves. Roots bear no leaves, are not distinguishable into nodes aud inter- nodes, but grow on continuously from the lower end. They commonly branch freely, but not from any fixed points nor in definite order. 69. Although roots generally do not give rise to stems, and there- fore do not propagate the plant, exceptions are not uncommon. For as stems may produce ad- ventitious buds, so also may roots. The roots of the Sweet Potato among herbs, and of the Osage Orange among trees freely produce adventi- tious buds, developing into leafy shoots ; and so these plants are propagated by root-cut- tings. But most growths of subterranean origin which pass for roots are forms of stems, the common Potato for example. 70. Roots of ordinary kinds and uses may be roughly classed into fibrous m&fieshy. 71. Fibrous Roots, such as those of Indian Corn (Fig. 70), of most annuals, and of many perennials, serve only for absorption : these are slender or thread-like. Fine roots of this kind, and the fine branches which most roots send out are called Rootlets. 72. The whole surface of a root absorbs moisture from the soil while fresh and new ; and the newer roots and rootlets are, the more freely do they im- bibe. Accordingly, as long as the plant grows above ground, and expands fresh foliage, from which moisture largely escapes into the air, so long it continues to extend and multiply its roots in the soil beneath, renewing and increasing the fresli surface for absorbing moisture, in proportion to the demand from above. And when growth ceases above ground, and the leaves die and fall, or no longer act, then the roots generally stop growing, Fig. 83-85. Forms of tap-root SECTION 5.) ROOTS. 35 and their soft and tender tips harden. From this period, therefore, until growth begins anew the next spring, is the best time for transplanting; especially for trees and shrubs. 73. The absorbing surface of young roots is much increased by the for- mation, near their tips, of Root-iiaik.s (Fig. 81, 82), which arc delicate tubular outgrowths from the surface, through the delicate walls of which moisture is promptly imbibed. 74. Fleshy Roots are those in which the root becomes a storehouse of nourishment. Typical roots of this kind are those of such biennials as the turnip and carrot; in which the food created in the first season's vege- tation is accumulated, to be expended the next season in a vigorous growth and a rapid development of flowers, fruit, and seed. By the time the seed is matured the exhausted root dies, and with it the whole plant. 75. Fleshy roots may be single or multiple. The single root of the commoner biennials is the primary root, or tap-root, which begins to thicken in the seedling. Names are given to its shapes, such as Conical, when it thickens most at the crown, or where it joins the stem, and tapers regularly downwards to a point, as in the Parsnip ami Carrot (Fig. 84) ; Turnip-shaped or napiform, when greatly thickened above, but abruptlj becoming slender below; as the Turnip (Fig. s^) ; and Pio. 86. Sweet-Potato plant forming thickened roots. Some in the middle are jusl beginning to thicken j one at the left has grown more; oneal therighl isstil! larger. Fie. 87. Fascicled fusiform roots of a Dahlia : a, a, lunK nn base of item. 36 ROOTS. [SECTION 5. Spindle-shaped, or Fusiform, when thickest in the middle and tapering to both ends; as the common Radish (Fig. 85). 76. These examples are of primary roots. It will be seen that turnips, carrots, and tne like, are not pure root throughout ; l'or the caulicle, from the lower end of which the root grew, partakes oi me thickening, perhaps also some joints of stem above : so the bud-bearing and growing top is stem. 77. A fine example of secondary roots (67), some of which remain fibrous for absorption, while a few thicken and store up food for the next season's growth, is furnished by the Sweet Potato (Fig. 86). As stated above, these are used for propagation by cuttings; for any part will produce ad- ventitious buds and shoots. The Dahlia produces fascicled (i. e. clustered) fusiform roots of the same kind, at the base of the stem (Fig. 87) : but these, like most roots, do not produce adventitious buds. The buds by which Dahlias are propagated belong to the surviving base of the stem above. 78. Anomalous Roots, as they may be called, are those which subserve other uses than absorption, food-storing, and fixing the plant to the soil. Aerial Roots, i. e. those that strike from stems in the open air, are common in moist and warm climates, as in the Mangrove which reaches the coast of Florida, the Banyan, and, less strikingly, in some herbace- ous plants, such as Sugar Cane, and even in Indian Corn. Such roots reach the ground at length, or tend to do so. Aerial Rootlets are abun- dantly produced by many climbing plants, such as the Ivy, Poison Ivy, Trumpet Creeper, etc., springing from the side of stems, which they fasten to trunks of trees, walls, or other supports. These are used by the plant for climbing. 79. Epiphytes, or Air- Plants (Fig. SS), are called by the former name because commonly growing Fig. 88. Epiphytes of Florida and Georgia, viz., Epidendrum conopseum, a small Orchid, and Tillandsia nsneoides, the so-called Long Moss or Black Moss, which is no moss, but a flowering plant, also T. recurvata ; on a bough of Live Oak. SECTION 5.] ROOTS. 37 upon the trunks or limbs of other plants; by the latter because, having no connection with the soil, they inusl derive their sustenance from the air only. They have aerial roots, which do not reach the ground, but are used to fix the plant to the surface upon which the plant grows: they also take a part in absorbing moisture from the air. 80. Parasitic Plants, of which there are various kiiuls, strike their roots, or what answer to roots, into the tissue of foster plants, or form at- tachments with their surface, so as to prey upon their juices. Of this sort is the Mistletoe, the seed of which germinates on the bough where it falls or is left by birds ; and the forming root penetrates the bark and en- grafts itself into the wood, to which it becomes united as firmly as a natural branch to its parent stem ; and indeed the parasite lives just as if it were a branch of the tree it grows and feeds on. A most common parasitic herb is the Dodder ; which abounds in low grounds in summer, and coils its long and slender, leafless, yellowish stems — resembling tangled threads of yarn — round and round the stalks of other plants; wherever they touch piercing the bark with minute and very short rootlets in the form of suckers, which draw out the nourishing juices of the plants laid hold of. Other parasitic plants, like the Beech-drops and Pine-sap, fasten their roots under ground upon the roots of neighboring plants, and rob them of their juices. 81. Some plants are partly parasitic ; while most of their roots act in the ordinary way, others make suckers at their tips which grow fast to the roots of other plants and rob them of nourishment* Some of our species of Gerardia do this (Fig. 89). 82. There are phanerogamous plants, like Monotropa or Indian Pipe, the roots of which feed mainly on decaying vegetable matter in the soil. These are Saprophytes, and they imitate Mushrooms and other Fungi in their mode of lite. 83. Duration of Roots, etc. Roots are said to be either annual, bien- nial, ox perennial. As respects the first and second, these terms maybe applied cither to the root or to the plant. 84. Annuals, as the name denotes, live for only one year, generally for Flo. 89. Roots of Yellow Geranlia, BOme attached to and feeding ou the root of a Blueberry-bosh. 38 STEMS. [SECTION 6. only a part of the year. They are of course herbs ; they spring from the seed, blossom, mature their fruit and seed, and then die, root and all. An- nuals of our temperate climates with severe winters start from the seed in spring, and perish at or before autumn. Where the winter is a moist and growing season and the summer is dry, winter annuals prevail; their seeds germinate under autumn or winter rains, grow more or less during winter, blossom, fructify, and perish in the following spring or summer. Annuals are fibrous-rooted. 85. Biennials, of which the Turnip, Beet, and Carrot are familiar ex- amples, grow the first season without blossoming, usually thicken their roots, laying up in them a stock of nourishment, are quiescent during the winter, but shoot vigorously, blossom, and seed the next spring or summer, mainly at the expense of the food stored up, and then die completely. Annuals and biennials flower only once ; hence they have been called Monocarpic (that is, once-fruiting) plants. 86. Perennials live and blossom year after year. A perennial herb, in a temperate or cooler climate, usually dies down to the ground at the end of the season's growth. But subterranean portions of stem, charged with buds, survive to renew the development. Shrubs and trees are of course perennial ; even the stems and branches above ground live on and grow year after year. 87. There are all gradations between annuals and biennials, and between these and perennials, as also between herbs and shrubs; and the distinc- tion between shrubs and trees is quite arbitrary. There are perennial herbs and even shrubs of warm climates which are annuals when raised in a cli- mate which has a winter, — being destroyed by frost. The Castor-oil plant is an example. There are perennial herbs of which only small portions survive, as off-shoots, or, in the Potato, as tubers, etc. Section VI. STEMS. 88. The Stem is the axis of the plant, the part which bears all the other organs. Branches are secondary stems, that is, stems growing out of stems. The stem at the very beginning produces roots, in most plants a single root from the base of the embryo-stem, or caulicle. As this root becomes a descending axis, so the stem, which grows in the opposite direc- tion is called the ascending axis. Rising out of the soil, the stem bears leaves; and leaf-bearing is the particular characteristic of the stem. But there are forms of stems that remain underground, or make a part of their growth there. These do not bear leaves, in the common sense ; yet they bear rudiments of leaves, or what answers to leaves, although not in the form of foliage. The so-called stemless or acaulescent plants are those which bear no obvious stem (caulis) above ground, but only flower-stalks, and the like. SECTION G.] STEMS. 39 89. Stems above ground, through differences in duration, texture, and size, form herbs, shrubs, trees, etc., or in other terms are Herbaceous, dying down to the ground every year, or alter blossoming. Suffrutescent, slightly woody below, there surviving from year to year. Suffrutic08e or Frutescent, when low stems are decidedly woody below, but herbaceous above. Frulicose or Shrubby, woody, living from year to year, and of considerable si/,<\ — not, however, more than three or four times the height of a man. Arborescent, when tree-like in appearance or mode of growth, or ap- proaching a tree in size. Arboreous, when forming a proper tree-trunk. 90. As to direction taken in growing, stems may, instead of growing upright or erect, be Diffuse, that is, loosely spreading in all directions. Declined, when turned or bending over to one side. Decumbent, reclining on the ground, as if too weak to stand. Assuri/ent or Ascending, rising obliquely upwards. Procumbent or Prostrate, lying flat on the ground from the first. Creeping or Repent, prostrate on or just beneath the ground, and striking root, as does the White Clover, the Partridge-berry, etc. Climbing or Scandent, ascending by clinging to other objects for support, whether by tendrils, as do the Pea, Grape- Vine, and Passion-tlower and Virginia Creeper (Fig. 92, 93) ; by their twisting leaf-stalks, as the Virgin's Bower; or by rootlets, like the Ivy, Poison Ivy, and Trumpet Creeper. Twining or Voluble, when coiling spirally around other steins or supports ; like the Morning-Glory (Fig. 90) and the Hop. 91. Certain kinds of stems or branches, appropriated to spe- cial uses, have re- such as flit- following : 9:2. A Culm, or straw-stem, such as that of Grasses and Sedges. 93. A Caudex is the old name for such a peculiar trunk as a Palm-stem; it is also used for an upright and thick rootstock. 94. A Sucker is a branch rising from si ems under ground. Such art1 produced abundantly by the Rose, Raspberry, and other plants said to multiply "by the root." If we uncover them, we see ;it once I he great difference between these subterranean branches and real 90 roots. The\ are only creeping branches underground. Remarking how the uprighl ^!e m ,t s from these branches l>e< le separate Fig. 90. Twining or voluble stem of Morning-Glory. 40 STEMS. [SECTION 6. plants, simply by the dying off of the connecting under-ground stems, the gardener expedites the result by cutting them through with his spade. That is, he propagates the plant "by division." 95. A Stolon is a branch from above ground, which reclines or becomes prostrate and strikes root (usually from the nodes) wherever it rests on the soil. Thence it may send up a vigorous shoot, which has roots of its own, and becomes an independent plant when the connecting part dies, as it does after a while. The Currant and the Gooseberry naturally multiply in this way, as well as by suckers (which are the same thing, only the connect- ing part is concealed under ground). Stolons must have suggested the operation of layering by bending down and covering with soil branches which do not naturally make stolons ; and after they have taken root, as they almost always will, the gardener cuts through the connecting stem, and so converts a rooting branch into a separate plant. 96. An Offset is a short stolon, or sucker, with a crown of leaves at the end, as in the Houseleek (Fig. 91), which propagates abundantly in this way. 97. A Runner, of which the Strawberry presents the most fa- miliar and characteristic example, is a long and slender, tendril-like stolon, or branch from next the ground, destitute of conspicuous leaves. Each runner of the Straw- berry, after having grown to its full length, strikes root from the tip, which fixes it to the ground, then forms a bud there, which develops into a tuft of leaves, and so gives rise to a new plant, which sends out new runners to act in the same way. In this manner a single Strawberry plant will spread over a large space, or produce a great number of plants, in the course of the summer, all connected at first by the slender runners ; but these die in the following winter, if not before, and leave the plants as so many separate individuals. 98. Tendrils are branches of a very slender sort, like runners, not destined like them for propagation, and therefore always destitute of buds or leaves, being intended only for climbing. Simple tendrils are such as those of Passion-flowers (Fig. 92). Compound or branching tendrils are borne by the Cucumber and Pumpkin, by the Grape-Vine, Virginia Creeper, etc. 99. A tendril commonly grows straight and outstretched until it reaches some neighboring support, such as a stem, when its apex hooks around it to secure a hold; then the whole tendril shortens itself by coiling up spirally, and so draws the shoot of the growing plant nearer to the sup- porting object. But the tendrils of the Virginia Creeper (Ampelopsis, Fig. Fig. 91. Houseleek (Semper vivuiu), with offsets. SECTION 6.] STEMS. 41 93), as also the shorter ones of the Japanese species, effect the object differ- ently, namely, by expanding the ti|>s of the tendrils into a flat disk, with an adhesive face. This is applied to the supporting object, and it adheres fin uly ; then a shortening of the tendril and its brandies by coiling brings up the growing shoot close to the support. This is an adapta- tion for climbing mural rocks or walls, or the trunks of trees, to which ordinary tendrils are unable to cling. The Ivy and Poison Ivy attain the same result by means of aerial rootlets (78). 100. Some tendrils are leaves or parts of leaves, as those of the Pea (Fig. 35). The na- ture of the tendril is known by its position. A tendril from the axil of a leaf, like that of Pas- sion-flowers (Fig. 92) is of course a stem, i. e. a branch. So is one which terminates a stem, as in the Grape-Vine. 101. Spines or Thorns (Fig. 95, 96) are commonly stunted and hardened branches or tips of stems or branches, as are those of Hawthorn, Honey-Locust, etc. In the Pear and Sloe all gradations occur between spines aud spine-like (spiuescenl) branches. Spines may be reduced and indurated leaves; as in the Barberry, where their nature is revealed by their situation, underneath an axillary bud. But Fio. 92. A small Passion-flower (Passi/lora aicyoides), showing the tendrils. Fie. \c. Piece ..f the stem of Virginia Creeper, bearing a leaf and a tendril 94. Tips of a tendril, about the natural Bize, sin. win- the di.sks by which they hold fast to wall . 42 STEMS. [SECTION 6. prickles, such as those of Blackberry and Roses, are only excrescences of the bark, and not branches. 102. Equally strange forms of stems are characteristic of the Cactus family (Fig. 111). These may be better understood by com- parison with 103. Subterranean Stems and Branches. These are very numerous and various ; but they are commonly overlooked, or else are confounded with roots. From their situation they are out of or- dinary sight ; but they will well repay examination. For the veg- etation that is carried on under ground is hardly less varied or important than that above ground. All their forms may be referred to four principal kinds : namely, the Rhizoma {Rhizome) or Rootstock, the Tuber, the Corm or solid bulb, and the true Bulb. 104. The Rootstock, or Rhi- zoma, in its simplest form, is merely a creeping stem or branch growing beneath the surface of the soil, or partly covered by it. Of this kind are the so-called creeping, running, or scaly roots, such as those by which the Mint (Fig. 97), the Couch-grass, or Quick-grass, and many other plants, spread so rapidly and widely, — " by the root," as it is said. That these are really stems, and not roots, is evident from the way in which Fig. 95. A branching thorn of Honey Locust, being an indurated leafless branch developed from an accessory bud far above the axil: at the cut portion below, three other buds (a) are concealed under the petiole. Fig. 96. Spine of Cockspur Thorn, developed from an axillary bud, as the leaf- scar below witnesses: an accessory leaf-bud is seen at its base. Fig. 97. Rootstocks, or creeping subterranean branches, of the Peppermint. SECTTON 6.] STEMS. 4.5 they grow; from kheir consisting of a succession of joints; and from the leaves which ihrv hear on each node, in the form of small scales, just like the lowest ones on the uprighl stem nexl the ground. Thej also pro. ilucc buds In the axils of these scales, showing the scales to be leaves; whereas real roots bear neither leaves nor axillary buds. Placed as the} arc ill the damp and dark soil, such stems naturally produce roots, just as the creeping stem does where it lies on the surface of the ground. 105. It is easy to see why plants with these running rootstocks take such rapid and wide possession of the soil, and why they are so hard to get rid of. They are always perennials ; the subterranean shoots live over the first winter, if not longer, and are provided with vigorous huds at every joint. Some of these buds grow in spring into upright stems, bearing foliage, to elaborate nourishment, and at length produce blossoms for re- production by seed ; while many others, fed by nour- ishment supplied from above, form a new generation of subterranean shoots ; and this is repealed over and over in the course of the season or in succeeding years. Meanwhile, as the subterranean shoots in- crease in number, the older ones, connecting the suc- cessive growths, die off year by year, liberating the already rooted side-branches as so many separate plants; and so on indefi- nitely. Cutting these running rootstocks into pieces, therefore, by the hoe or the plough, far from destroying the plant, only accelerates the propaga- tion ; it converts one many-branched plant into a great number of separate individuals. Cutting into pieces only multiplies the pest ; for each piece (Fig. OS) is already a plantlet, with its roots and with a bud in the axil of its scale-like leaf (either latent or apparent), and with prepared nourishment enough to develop this bud into a leafy stem ; and so a single plant is all the more speedily converted into a multitude. Whereas, when the subterra- nean parts are only roots, cutting away the stem completely destroys the plant, except in the rather rare cases where the root freely produces adventitious buds. 106. Rootstocks are more commonly thickened by the storing up of considerable nourishing matter in their tissue. The common species of Iris (Fig. 164) in the gardens have stout rootstocks, which are onl\ partly covered by the soil, and which bear foliage-leaves instead of mere scales, closely covering the upper part, while the lower produces roots. As the leaves die, year by year, and decay, a scar left in the form of a ritiL,' marks the place where each leaf was attached, that is, marks so many mules, separated by very Bhort internodes. li>7. Some rootstocks are marked with large round sears of a different Fig. 98. A piece of the running rootstock of thu Peppermint, with Its node or joint, and an axillary bud ready t<» grow. 44 STEMS. [section 6. sort, like those of the Solomon's Seal (Fig. 09), which gave this name to the plant, from their looking somewhat like the impression of a seal upon wax. Here the rootstock sends up every spring an herbaceous stalk or stem, which bears the foliage and flowers, and dies in autumn. The seal is the circular scar left by the death and separation of the base of the stout stalk from the living rootstock. As but one of these is formed each year, tliey mark the limits of a year's growth. The bud at tlie end of the rootstock in the figure (which was taken in summer) will grow the next spring into the stalk of the season, which, dying in autumn, will leave a similar scar, while another bud will be formed farther on, crowning the ever-advancing summit or growing end of the stem. 108. As each year's growth of stem makes its own roots, it soon becomes independent of the older parts. And after a certain age, a portion annually dies off behind, about as fast as it increases at the growing end, death following life with equal and cer- tain step, with only a narrow interval. In vigorous plants of Solomon's Seal or Iris, the living rootstock is several inches or a foot in length ; wrhile in the short rootstock of Trillium or Birthroot (Fig. 100) life is reduced to a narrower span. 109. An upright or short rootstock, like this of Trillium, is commonly called a Caudex (93) ; or when more shortened and thickened it would become a corm. 110. A Tuber may be understood to be a portion of a rootstock thick- ened, and with buds (eyes) on the sides. Of course, there are all grada- tions between a tuber and a rootstock. Helianthus tuberosus, the so-called Jerusalem Artichoke (Fig. 101), and the common Potato, are typical and familiar examples of the tuber. The stalks by which the tubers are at- tached to the parent stem are at once seen to be different from the roots, both in appearance and manner of growth. The scales on the tubers are the rudiments of leaves ; the eyes are the buds in their axils. The Potato-plant Fig. 99. Rootstock of Solomon's Seal, with the bottom of the stalk of the sea- son, and the hud for the next year's growth. Fig. 100. The very short rootstock and strong terminal bud of a Trillium or Birthroot. SECTION 6.] STEMS. 45 has three forma of branches: 1. Those that bear ordinary leaves expanded in the air, to digest what they gather from it and what the roots gather from the soil, and convert it into nourishment. 2. Altera while a second set of branches at the summit of the plant bear (lowers, which form fruit and seed out of B portion of the nour- ishment which the leaves have pre- pared. 3. Bui a larger pari of this nourishment, while in a liquid state, is carried down the stem, into a third sort of branches under ground, and accumulated in the form of starch at their extremities, which become tu- bers, or deposito- ries of prepared solid food, — just as in the Turnip, Carrot, and Dah- lia (Fig. 83-87), it is deposited in the root. The use of the store of food is obvious enough. In the autumn the whole plant dies, except the seeds (if it formed them) and the tubers ; and the latter are left disconnected in the ground. Just as that small portion of nourishing matter which is deposited in the seed feeds the embryo when it germinates, so the much larger portion deposited in the tuber nourishes its buds, or eyes, when they likewise grow, the next spring, into new plants. And the great supply enables them to shoot with a greater vigor at the beginning, and to produce a greater amount of vegetation than the seedling plant could do in the same space of time ; which vegetation in turn may prepare and store up, in the course of a few weeks or months, the largest quantity of solid nourishing material, in a form most available for food. Taking advantage of this, man has transported the Potato from the cool Andes of Chili to other cool climates, and makes it yield him a copious supply of food, especially important in countries where the season is too short, or the summer's heat too little, for profitably cultivating the principal grain-plants. 111. The Corm or Solid Bulb, like that of Cyclamen (Fig. 103), and of Indian Turnip (Fig. 101). is a very short and thick fleshy subterranean stem, often broader than high. It semis oil' roots from its lower end. or rather face, leaves and stalks from its upper. The conn of Cyclamen goes on to enlarge and to produce a succession of (lowers and leaves year after year. Fir,. 101. Tubers of Belianthus tuberosum called "artichokes." Fio. 1()'2. Bulblet-Iike tubers, such as are occasionally formed on the stem of a Potato-plant above ground. 46 STEMS. [SECTION 6. That of Indian Turnip is formed one year and is consumed the next. Fig. 104 represents it in early summer, having below the corm of last year, from which the roots have fallen. It is partly consumed by the growth of the stem for the season, and the corm of the year is forming at base of the stem above the line of roots. 112. The corm of Crocus (Fig. 105, 106), like that of its relative Gladiolus, is also reproduced annually, the new ones forming upon the summit and sides of the old. Such a corm is like a tuber in bud- ding from the sides, i. e. from the axils of leaves ; but these leaves, instead of being small scales, are the sheathing bases of fo- liage-leaves which covered the surface. It resem- bles a true bulb in having these sheaths or broad scales ; but in the corm or solid bulb, this solid part or stem makes up the principal bulk. 113. The Bulb, strictly so-called, is a stem like a reduced corm as to its solid part (or plate) ; while the main body consists of thickened scales, which are leaves or leaf-bases. These are like bud- scales ; so that in fact a bulb is a bud with fleshy scales on an exceedingly short stem. Compare a White Lily bulb (Fig. 107) with the strong scaly buds of the Hickory and Horse-chestnut (Fig. 72 and 73), and the resemblance will appear. In conns, as in tubers and rootstocks, the store of food for future growth is deposited in the stem ; while in the bulb, the greater part is deposited in the bases of the leaves, changing them into thick scales, which closely overlap or enclose one another. 114. A Scaly Bulb (like that of the Lily, Fig. 107, 108) is one in which the scales are thick but comparatively narrow. 115. A Tunicated or Coated Bulb is one in which the scales enwrap each other, forming concentric coats or layers, as in Hyacinth and Onion. Fig. 103. Corm of Cyclamen, much reduced in size : roots from lower face, leaf- stalks and flower-stalks from the upper. Fig. 104. Corm of Indian Turnip (Arisauna). Fig. 105. Corm of a Crocus, the investing sheaths or dead leaf-bases stripped off. The faint cross-lines represent the scars, where the leaves were attached, i. e. the nodes : the spaces between are the internodes. The exhausted corm of the previous year is underneath ; forming ones for next year on the summit and sides. Fig. 106. Section of the same. SECTION C] STEMS. 47 116. Bulblets are very small bulbs growing out of larger ones; small bulbs produced above ground on some plants, as in t lit- axils of leaves of the bulbilemus Lilies of I lie gardens (Fig. 110), and often in flower-clusters of the Leek and Onion. They are plainly buds with thickened scales. They never grow into branches, but detach themselves when full grown, fall to the ground, and take rool there to form new plants. 117. Consolidated Vegetation. An ordinary herb, shrub, or tree is evidently constructed on the plan developing an extensive surface. In fleshy rootstocks, or the the I tubers, corms, and bulbs, the more enduring portion of the plant is con- centrated, and reduced for the time of struggle (as against drought, heat, or cold) to a small amount of exposed surface, and this mostly sheltered in the soil. There are many similar consolidated forms which are not subterranean. Thus plants like the Houseleek (Fig. 91) imitate a bulb. Among Cactuses the columnar species of Cereus (Fig. Ill, 6), may be lik- llu pned to rootstocks. A green riud serves the purpose of foliage ; but the surface is as nothing compared with an ordinary leafy plant of the same bulk. Compare, for instance, the largest Cactus known, the Giant Cereus of the Gila River (Fig. Ill, in the background), which rises to the height of fifty or sixty feet, with a common leafy tree of the same height, such as that in Fig. 89, and estimate how vastly greater, even without the foli- age, the surface of the latter is than that of the former. Compare, in the Fio. 107. Bulb of a wild Lily. 108. The same divided lengthwise, showing two forming buds of the next generation. PlO. 109. A ground leaf of White Lily, its base (cut across) thickened into a bulb-scale. This plainly shows that bulb-scales are leaves. Fig. 110. Bulblets in the axil* of leaves of a Tiger Lily. 48 STEMS. [SECTION 6. same view, an Opuntia or Prickly-Pear Cactus, its stem and brandies formed of a succession of thick and flattened joints (Fig. Ill, a), which may be likened to tubers, or an Epiphyllum (d), having short and flat joints, with an ordinary leafy shrub or herb of equal size. And finally, in Melon-Cactuses, Echinocactus (c), or other globose forms (which may be likened to permanent conns), with their globular or bulb-like shapes, we have plants in the compactest shape ; their spherical figure being such as to expose the least possible amount of substance to the air. These are adaptations to climates which are very dry, either throughout or for a part of the year. Similarly, bulbous and corm-bearing plants, and the like, are examples of a form of vegetation which in the growing season may expand a large surface to the air and light, while during the period of rest the living vegetable is reduced to a globe, or solid form of the least possible surface ; and this protected by its outer coats of dead and dry scales, as well as by its situation under ground. Such are also adapted to a season of drought. They largely belong to countries which have a long hot season of little or no rain, when, their stalks and foliage above and their roots beneath early perishing, the plants rest securely in their compact bulbs, filled with nourishment and retaining their moisture with great tenacity, until the rainy season comes round. Then they shoot forth leaves and flowers with wonderful rapidity, and what was perhaps a desert of arid sand becomes green with foliage and gay with blossoms, almost in a day. SECTION 7.] ORDINARY LEAVES. 49 Section VII. LEAVES. 118. Stems bear leaves, at definite points (nodes, L3); and these are produced iu a great variety of forms, and subserve various uses. The commonest kind of leaf, which tin- re l'o re may be taken as the type or pattern, is an expanded green body, by means of which the plant exposes to the air and light the matters which it imbibes, exhales certain portions, and assimilates the residue into vegetable matter for its nourishment and growth. 119. But the fact is already familiar (10-30) that leaves occur under other forms and serve for other uses, — for the storage of food already assimilated, as in thickened seed-leaves and bulb-scales ; for covering, as in bud-scales ; and still other uses arc to be pointed out. Indeed, sometimes they are of no service to the plant, being reduced to mere scales or rudi- ments, such as those on the rootstocks of Peppermint (Fig. 97) or the tubers of Jerusalem Artichoke (Fig. 101). These may be said to be of service only to the botanist, in explaining to him the plan upon which a plant is constructed. 120. Accordingly, just as a rootstock, or a tuber, or a tendril is a kind of stem, so a bud-scale, or a bulb-scale, or a cotyledon, or a petal of a flower, is a kind of leaf. Even in respect to ordinary leaves, it is natural to use the word either in a wider or in a narrower sense ; as when in one sense we say that a leaf consists of blade and petiole or leaf-stalk, and in another sense say that a leaf is petioled, or that the leaf of Hepatica is three-lobed. The connection should make it plain whether by leaf we mean leaf-blade only, or the blade with any other parts it may have. And the student will readily understand that by leaf in its largest or morphological sense, the botanist means the organ which occupies the place of a leaf, whatever be its form or its function. § 1. LEAVES AS FOLIAGE. 121. This is tautological; for foliage is simply leaves-, but it is very convenient to speak of typical leaves, or those which serve the plant for assimilation, as foliage-leaves, or ordinary leaves. These may tirst be considered. 122. The Parts of a Leaf. The ordinary leaf, complete in its Darts, consists of blade, foot-stalk, or petiole, and a pair of stipule*. 123. First the Blade or Lamina, which is the essential part of ordinary leases, that is, of such as serve the purpose of foliage. In struct ure it con- sists of a softer part, \\\v green pulp, called parenchyma, which is traversed and supported by a fibrous frame, the parts of which are called rids or reins, on account of a certain likeness iu arrangement to the veins of animals. 4 50 LEAVES. [section 7. The whole surface is covered by a transparent skin, the Epidermis, not unlike that which covers the surface of all fresh shoots. 124. Note that the leaf-blade expands horizontally, — that is, normally presents its faces one to the sky, the other to the ground, or when the leaf is erect the upper face looks toward the stem that bears it, the lower face away from it. Whenever this is not the case there is something to be explained. 125. The framework consists of icood, — a fibrous and tough material which runs from the stem through the leaf-stalk, when there is one, in the form of parallel threads or bundles of fibres ; and in the blade these spread out in a hori- zontal direction, to form the ribs and veins of the leaf. The stout main branches of the framework are called the Ribs. When there is only one, as in Fig. 112, 114, or a middle one decidedly larger than the rest, it is called the Midrib. The smaller divi- sions are termed Feins ; and their still smaller subdivisions, Veinlets. The latter subdivide again and again, until they be- come so fine that they are invisible to the naked eye. The fibres of which they are composed are hollow; forming tubes by which the sap is brought into the leaves and carried to every part. 126. Venation is the name of the mode of veining, that is, of the way in which the veins are distributed in the blade. This is of two principal kinds ; namely, the parallel-veined, and the netted-veined. 127. In Netted-veined (also called Reticulated) leaves, the veins branch off from the main rib or ribs, divide into finer and finer veinlets, and the branches unite with each other to form meshes of network. That is, they anastomose, as anatomists say of the veins and arteries of the body. The Quince-leaf, in Fig. 112, shows this kind of veining in a leaf with a single rib. The Maple, Basswood, Plane or Buttonwood (Fig. 74) show it in leaves of several ribs. 128. In parallel-veined leaves, the whole framework consists of slender ribs or veins, which run parallel with each other, or nearly so, from the base to the point of the leaf, — not dividing and subdividing, nor forming meshes, except by minute cross-veinlets. The leaf of any grass, or that of the Lily of the Valley (Fig. 113) will furnish a good illustration. Such parallel veins Linnaeus called Nerves, and parallel-veined leaves are still commonly called nerved leaves, while those of the other kind are said to be Fio. 112. Leaf of the Quince: b, blade ; p, petiole; st, stipules. SECTION 7.] ORDINARY LEAVES. 51 veined, — terms which it is convenient to use, although these " nerves " and " veins" arc all the same thing, and have no likeness to the nerves and little to the veins of animals. 129. Netted-veined leaves belong to plants which have a pair of seed- leaves or cotyledons, such as the Maple (Kg, 20, 2-i,), Beech (Fig. 33), and the like ; while parallel-veined or nerved leaves belong to plants with one cotyledon or true seed-leaf; such as the Iris (Fig. 59), and Indian Corn (Fig. 70). So that a mere glance at the leaves generally tells what the structure of the embryo is, and refers the plant to one or the other of these two grand classes, — which is a great convenience. For when plants differ from each other in some one important respect, they usually dilfer corres- pondingly in other respects also. 130. Parallel- veined leaves are of two sorts, — one kind, and the com- monest, having the ribs or nerves all running from the base to the point of the leaf, as in the examples already given ; while in another kind they run from a midrib to the margin, as in the common Pickerel-weed of our ponds, in the Banana, in Calla (Fig. 114), and many similar plants of warm climates. 131. Netted-veined leaves are also of two sorts, as in the examples al- ready referred to. In one ease the veins all rise from a single rib (the midrib), as in Fig. LIS, 116-127. Such leaves are called Feather-veined or Venni-veined, i. e. Pinnateljf -veined ; both terms meaning the same thing, namely, thai the veins are arranged on the sides of the rib like the plume of a feather on each side of the shaft. Fig. 113. A (|>;irallel-veined) leaf of the Lily of the Valley. 114. One of the Calla Lily. 52 LEAVES. [SECTION 7. 132. In the other case (as in Fig. 74, 129-132), the veins branch off from three, five, seven, or nine ribs, which spread from the top of the leaf- stalk, and run through the blade like the toes of a web-footed bird. Hence these are said to be Palmately or Digitately veined, or (since the ribs di- verge like rays from a centre; Radiate-veined. 133. Since the general outline of leaves accords with the frame-work or skeleton, it is plain that feather-veined (or penni-veined ) leaves will incline to elongated shapes, or at least to be longer than broad ; while in radiate- veined leaves more rounded forms are to be expected. A glance at the following figures shows this. 134. Forms of Leaves as to General Outline. It is necessary to give names to the principal shapes, and to define them rather precisely, since they afford easy marks for distinguishing species. The same terms are used 115 116 117 118 119 120 for all other flattened parts as well, such as petals ; so that they make up a great part of the descriptive language of Botany. It will be a good exer- cise for young students to look up leaves answering to these names and definitions. Beginning with the narrower and proceeding to the broadest forms, a leaf is said to be Linear (Fig. 115), when narrow, several times longer than wide, and of the same breadth throughout. Lanceolate, or Lance-shaped, when conspicuously longer than wide, and tapering upwards (Fig. 116), or both upwards and downwards. Oblong (Fig. 117), when nearly twice or thrice as long as broad. Elliptical (Fig. 118) is oblong with a flowing outline, the two ends alike in width. Oval is the same as broadly elliptical, or elliptical with the breadth con- siderably more than half the length. Ovate (Fig. 119), when the outline is like a section of a hen's egg lengthwise, the broader end downward. Orbicular, or Rotund (Fig. 132), circular in outline, or nearly so. 135. A leaf which tapers toward the base instead of toward the apex may be Oblanceolate (Fig. 121) when of the lance-shaped form, only more tapering toward the base than in the opposite direction. Spatulate (Fig. 122) when more rounded above, but tapering thence to a narrow base, like an old-fashioned spatula. Fig. 115-120. A series of shapes of feather- veined leaves. SECTION ORDINARY LEAVES. 53 Obovate (Fig. 123) or inversely ovate, that is, ovate with the narrower end down. Cuncate or Cuneiform, that is, Wedge-shaped (Fig. 124), broad above and tapering by nearly straight lines to an acute angle at the base. 136. As to the Base, its shape characterizes several forms, sucli as Cordate or Heart-shaped (Fig. 120, 129), when a leaf of an ovate form, or something like it, has the out- line of its rounded base turned in (forming a notch or sinus) where the stalk is attached. Reniform, or Kidney- shaped (Fig. 131), like the last, only rounder and broader than long. Auriculate, or Eared, having a pair of small 125 126 127 and blunt projections, or ears, at the base, as in one species of Magnolia (Fig. 12G). Sagittate, or arrow-shaped, where such ears are acute and turned downwards, while the main body of the blade tapers upwards to a point, as in the common Sagittaria or Arrow-head, and in the Arrow-leaved Polygonum (Fig. 125). Hastate, or Halberd-shaped, when such lobes at the base point outwards, giving the shape of the halberd of the olden time, as in another Polygonum (Fig. 127). Peltate, or Shield-shaped (Fig. 132), is the name applied modification of the leaf, commonly of a rounded form, where to a curious the footstalk IS attached to the lower surface, instead of the base, and therefore is natu- Fio. 121, oblanceolate ; 122, spatulate ; 123, obovate; ami 124. wedge-shaped, feather-veined, leaves. Fig. 125, ragittate ; 126, auriculate ; and 127, halberd-shaped or hastate leaves. Flu. 12S-132. Various forms of radiate-veined leaves. 54 LEAVES. [section 7. rally likened to a shield borne by the outstretched arm. The common Watershield, the Nelumbiuin, and the White Water-lily, and also the Man- drake, exhibit this sort of leaf. On comparing the shield-shaped leaf of the common Marsh Pennywort (Fig. 132) with that of another common species (Fig. 130), it is at once seen that a shield-shaped leaf is like a kidney-shaped (Fig. 130, 131) or other rounded leaf, with the margins at the base brought together aud united. 137. As to the Apex, the following terms express the principal varia- tions : — Acuminate, Pointed, or Taper-pointed, when the summit is more or less prolonged into a narrowed or tapering point; as in Fig. 133. Acute, ending in an acute angle or not prolonged point ; Fig. 134. Obtuse, with a blunt or rounded apex ; as in Fig. 135, etc. Truncate, with the end as if cut off square ; as in Fig. 136. Retuse, with rounded summit slightly indented, forming a very shallow notch, as in Fig. 137. Emarginate, or Notched, indented at the end more decidedly; as in Fig. 138. Obcordate, that is, inversely heart-shaped, where an obovate leaf is more deeply notched at the end (Fig. 139), as in White Clover and Wood-sorrel ; so as to resemble a cordate leaf inverted. Cuspidate, tipped with a sharp and rigid point ; as in Fig. 140. Mucronate, abruptly tipped with a small and short point, like a mere projection of the midrib ; as in Fig. 141. Aristate, Awn-pointed, and Bristle-pointed, are terms used when this mucronate point is extended into a longer bristle-form or slender appen- dage. The first six of these terms can be applied to the lower as well as to the upper end of a leaf or other organ. The others belong to the apex only. 140 141 138. As to degree and nature of Division, there is first of all the dif- ference between Simple Leaves, those in which the blade is of one piece, however much it may be cut up, and Compound Leaves, those in which the blade consists of two or more sep- arate pieces, upon a common leaf-stalk or support. Yet between these two kinds every intermediate gradation is to be met with. 139. As to Particular Outlines of Simple Leaves (and the same applies to their separate parts), they are Fig. 133-141. Forms of the apex of leaves. SECTION 7.] ORDINARY LEAVES. 55 Entire, when their general outline is completely filled out, so that the margin is an even line, without teeth or notches. Serrate, or Saw-toothed, when the margin only is cut into sharp teeth, like those of a saw, and pointing forwards : as in Pig 142. Dentate, ox Toothed, A when such teeth point outwards, instead of forwards ; as in Fig. 1 13. Crenate, or Scal- loped, when the teeth are broad and round- ed ; as in Fig. 144. Repand, Undulate, or Wary, when the \ margin of the leaf forms a wavy line, bending slightly in- wards and outwards in succession; as in Fig. 145. Sinuate, when the margin is more strongly sinuous or turned inwards and outwards ; as in Fig. 146. Incised, Cut, or Jagged, when the margin is cut into sharp, deep, and irregular teeth or incisions; as in Fig. 117- Lobed, when deeply cut. Then the pieces are in a general way called Lobes. The number of the lobes is briefly expressed by the phrase two- lobed, fhrec-lobed,five-lobed, many-lobed, etc., as the case may be. 140. When the depth and character of the lobing needs to be more par- ticularly specified, the following terms are employed, viz. : — Lobed, in a special sense, when the incisions do not extend deeper than about half-way between the margin and the centre of the blade, if so far, and are more or less rounded ; as in the leaves of the Post-Oak, Fig. IIS, and the llepatica. Fig. 152. Cleft, when the incisions extend half way down or more, and especially ▼hen they are sharp; as in Fig. 149, 153. And the phrases two-cleft, or, in the Latin form, bifid, three-cleft or trijid. four-cleft or quadrifid, five- cleft or quinquefid, etc., or many-cleft, in the Latin form, multifid, — express the number of the Segments, or portions. Parted, when the incisions arc still deeper, lmt yet do nol quite reach to the midrib or the base of the blade; as in Fig. l">n. 154. And the terms tlCO-parted, three-parted, etc., express the number of such divisions. Divided, when the incisions extend quite to the midrib, as in the lower pari of Fig. 151, or to the leaf-stalk, as in Fig. 155 which really make- the Fig. 142-147* Kinds of margin of Leaves. 56 LEAVES. [SECTION 7 leaf compound. Here, using the Latin form, the leaf is said to be bisected, trisected (Fig. 155), etc., according to the number of the divisions. 141. The Mode of Lobing or Division corresponds to that of the veining, whether pinnately veined or palmately veined. In the former the notches or incisions, or sinuses, coming between the principal veins or ribs are directed toward the midrib : in the latter they are directed toward the apex of the petiole ; as the figures show. 142. So degree and mode of division may be tersely expressed in brief phrases. Thus, in the four upper figures of pinnately veined leaves, the first is said to be pinnately lobed (in the special sense), the second pinnately cleft (or pinna 'tifid in Latin form), the third pinnately parted, the fourth pinnately divided, or pinnatisected. 143. Correspondingly in the lower row, of palmately veined leaves, the first is palmately lobed, the second palmately cleft, the third palmately parted, the fourth palmately divided. Or, in other language of the same meaning (but now less commonly employed), they are said to be digitately lobed, cleft, parted, or divided. 144. The number of the divisions or lobes may come into the phrase. Thus in the four last named figures the leaves are respectively palmately three-lobed, three-cleft (or trifid), three-parted, three-divided, or better (in Latin form), trisected. And so for higher numbers, &sfve-lobed,fve-cleft, Fig. 148, pinnately lobed; 149, pinnately cleft; 150, pinnately parted; 151, pinnately divided, leaves. Fig. 152, palmately three-lobed ; 153, palmately three-cleft ; 154, palmately three-parted ; 155, palmately three-divided or trisected, leaves. SECTION 7.] ORDINARY LEAVES. 57 etc., up to many-loljctl, many-cleft or maltijhl, etc. The same mode of ex- pression may be used fur pinnately lubed leaves, as pinnately l-lobal, -d-ft, -parted, etc. 145. The divisions, lobes, etc., may themselves be entire (without teeth or notches), or serrate, or otherwise toothed or incised; or lobed, cleft, parted, etc. : in the latter cases making twice pinnatiji/l, twice palmately or pinnately tube//, parte//, or divided leaves, etc. From these illustrations one will perceive how the botanist, in two or three words, may describe any one of the almost endlessly diversified shapes of leaves, so as to give a clear and definite idea of it. 140. Compound Leaves. A compound leaf is one which has its blade in entirely separate parts, each usually willi a stalklet of its own; and the stalklet is often jointed (or articulated) with the main leaf-stalk, just as this is jointed with the stem. When this is the case, there is no doubt that the leaf is compound. But when the pieces have no stalklets, and are not jointed with the main leaf-stalk, it may be considered either as a divided simple leaf, or a compound leaf, according to the circumstances. This is a matter of names where all intermediate forms may be expected. 147. While the pieces or projecting parts of a simple leaf-blade are called Lobes, or in deeply cut leaves, etc., Segments, or Divisions, the sep- arate pieces or blades of a compound leaf are called LEAFLETS. 118. Compound loaves are of two principal kinds, namely, the Pinnate and the Palmate ; answering to the two modes of veiuing in reticulated leaves, and to the two sorts of lobed or divided leaves (111). 149. Pinna fe leaves are those in which the leaflets are arranged on the sides of a main leaf-stalk; as in Fig. 156-158 Tl.ev answer to the Fio. 156-158. Pinnate leaves, the first with an odd leaflel (odd-pinnate)] the second with a tendril in place uf uppermost leaflets; the third abruptly pinnate, or of even pairs. 58 LEAVES. [section 7. feather-veined (i. e. pinnately -veined) simple leaf; as will be seen at once on comparing the forms. The leaflets of the former answer to the lobes or divisions of the latter ; and the continuation of the petiole, along which the leaflets are arranged, answers to the midrib of the simple leaf. 150- Three sorts of pinnate leaves are here given. Fig. 156 is pinnate with an odd or end leaflet, as in the Common Locust and the Ash. Fig. 157 is pinnate with a tendril at the end, in place of the odd leaflet, as in the Vetches and the Pea. Fig. 158 is evenly or abruptly pinnate, as in the Honey-Locust. 151. Palmate (also named Digitate) leaves are those in which the leaf- lets are all borne on the tip of the leaf- stalk, as in the Lupine, the Common Clover, the Virginia Creeper (Fig. 93), and the Horse-chestnut and Buckeye (Fig. 159). They evidently answer to the radiate-veined or palmately -veined simple leaf. That is, the Clover-leaf of three leaflets is the same as a palmately three-ribbed leaf cut into three separate leaflets. And such a simple five-lobed leaf as that of the Sugar-Maple, if more cut, so as to separate the parts, would produce a palmate leaf of five leaflets, like that of the Horse-chestnut or Buckeye. 152. Either sort of compound leaf may have any number of leaflets ; yet palmate leaves cannot well have a great many, since they are all crowded together on the end of the main leaf-stalk. Some Lupines have nine of eleven; the Horse-chestnut has seven, the Sweet Buckeye more commonly five, the Clover three. A pinnate leaf often has only seven or five leaflets, or only three, as in Beans of the genus Phaseolus, etc. ; in some rarer cases only two; in the Orange and Lemon and also in the common Barberry there is only one ! The joint at the place where the leaflet is united with the petiole distinguishes this last case from a simple leaf. In other species of these genera the lateral leaflets also are present. 153. The leaflets of a compound leaf may be either entire (as in Fig. 126-128), or serrate, or lobed, cleft, parted, etc. ; in fact, may present all the variations of simple leaves, and the same terms equally apply to them. 154. When the division is carried so far as to separate what would be one leaflet into two, three, or several, the leaf becomes doubly or twice compound, either pinnately or palmately, as the case may be. For example, while the clustered leaves of the Honey-Locust are simply pinnate, that is, once pinnate, those on new shoots are bipinnate, or twice pinnate, as in Fisr. 160. When these leaflets are again divided in the same way, the leaf Fig. 159. Palmate (or digitate) leaf of five leaflets, of the Sweet Buckeye. SECTION 7.] ORDINARY LEAVES. 59 becomes thrice pinnate, or tripinnate, as in many Acacias. The first, divi- sions are called Pinna; the others, Pinnules; and the lust, or little blades themselves, Leaflets, ] 55. So the palmate leal", if again compounded in the same way, be- comes twice palmate ) or, as we sav when the divisions are ill threes, twice ternate (in Latin form biter- nate) ; if a third time compounded, thrice ternate or triternate. Hut if the division goes still further, or if the degree is variable, we simply say that the leaf is decom- pound ; either palmately or pin- nately decompound, as the case may be. Thus, Fig. 161 repre- sents a four times ternately com- pound (in other words a ternately decompound) leaf of a common Meadow Hue. 156. When the botanist, in de- scribing leaves, wishes to express the number of the leaflets, he may use terms like these : — Unifoliolate, for a compound leaf of a single leaflet ; from the Latin unum, one, and foliolum, leaflet. Bifoliolate, of two leaflets, from the Latin bis, twice, andfoliolum, leaflet. Trifoliolate (or ternate), of three leaf- lets, as the Clover ; and so on. Palmate!;/ bifoliolate, trifoliolate, quadrifoliate, plurifoliolate (of several leaflets), etc. : or else Pinnately bi-, tri-s quadri-, or pluri- foliolate (that is, of two, three, four, five, or several leaflets), as the case may be: I hesc are terse ways of de- noting in single phrases both the num- ber of leaflets and the kind of eom- pounding. L57« Of foliage-leaves having certain peculiarities in structure, the following may be noted : — Pio. 1'i1*. A twice-pinnate abruptly) leaf of the lloney-Locust. Fig. 1G1. Ternately decompound leaf of Meadow Rue. 60 LEAVES. [SECTION 7. 158. Perfoliate Leaves. In these the stem that bears them seems to run through the blade of the leaf, more or less above its base. A. common Bellwort (Uvularia perfoliata, Fig. 162) is a familiar illustration. The lower and earlier leaves show it distinctly. Later, the plant is apt to produce some leaves merely clasping the stem by the sessile and heart-shaped base, and the latest may be merely sessile. So the series explains the peculiarity : in the formation of the leaf the bases, meeting around the stem, grow together there. 159. Connate-perfoliate. Such are the upper leaves of true Honey- suckles. Here (Fig. 163) of the opposite and sessile leaves, some pairs, especially the uppermost, .in the course of their formation unite around the stem, which thus seems to run through the disk formed by their union. 160. Equitant Leaves. While ordinary leaves spread horizontally, and present one face to the sky and the other to the earth, there are some that present their tip to the sky, and their faces right and left to the horizon. Among these are the equitant leaves of the Iris or Flower-de-Luce. In- spection shows that each leaf was formed as if folded together lengthwise, Fig. 162. A summer branch of Uvularia perfoliata; lower leaves perfoliate, upper cordate-clasping, uppermost simply sessile. Fig. 163. Branch of a Honeysuckle, with connate-perfoliate leaves. Fig. 164. Rootstock and equitant leaves of Iris. 165. A section across the cluster of leaves at the bottom, showing the equitation. SECTION 7.] ORDINARY LEAVES. 61 so that what would be the upper .surface is within, and all grown together, except next the botton , where each Leaf covers the next younger one. It was from their straddling over each other, like a man on horseback (as is seen in the cross-section, Fig. 105), that Linnaeus, with his lively fancy, called these EquitatU leaves. 161. Leaves with no distinction of Petiole and Blade. The leaves of Iris just mentioned show one form of this The Hat but narrow leaves of Jonquils, Dallbdils, and the cylindrical leaf of Onions are other instances. Needle-shaped leaves, like those of the Pine, Larch, and Spruce, and the aid -shaped as well as the scale-shaped leaves of Junipers, Red Cedar, and Arbor-Vita.- (Fig. 166), arc examples. 162. Phyllodia. Sometimes an expanded petiole takes the place of the blade; as in numerous New Holland Acacias, some of which are now common in greenhouses. Such counterfeit blades are called phyllodia, — meaning leaf-like bodies. They may be known from true blades by their standing edgewise, their margins being directed upwards and downwards; while in true blades the faces look upwards and downwards ; excepting in equitant leaves, as already explained. 163. Falsely Vertical Leaves. These are apparent exceptions to the rule, the blade standing edgewise in- stead of flatwise to the stem ; but this position comes by a twist of the stalk or the base of the blade. Such leaves present the two faces about equally to the light. The Compass-plant (Silphinm laciniatum) is an example. So also the leaves of Bolto- nia, of "Wild Lettuce, and of a vast num- ber of Australian Myrtaceous shrubs and trees, which much resemble the phyllodia of the Acacias of the same country. They are familiar in Calliste- mon, the Bottle-brush Flower, and in Eucalyptus. But in the latter the leaves of the young tree have the nor- mal structure and position. 164. Cladophylla, meaning branch- leaves. The foliage of Ruscus (the Butcher's Broom of Europe) and of Myrsiphyllum of South Africa (cultivated for decoration under the false l'i .. UJ6. Branch of Arbor-Vita, with awl-shaped and scale shaped leaves Fio. 167. The ambiguous leaf? (cladophyllum) of Myrsiphyllum. Fig. 168. Same of Uuscus, or Butcher's Broom. LEAVES. [SECTION 7. name of Smilax) is peculiar and puzzling. If these blades (Fig. 167, 168) are really leaves, they are most anomalous in occupying the axil of anothei leaf, reduced to a little scale. Yet they have an upper and lower face, as leaves should, although they soon twist, so as to stand more or less edge- wise. If they are branches which have assumed exactly the form and office of leaves, they are equally extraordinary in not making any further development. But in Ruscus, flowers are borne on one face, in the axil of a little scale : and this would seem to settle that they are branches. In Asparagus just the same things as to position are thread-shaped and branch»like. § 2. LEAVES OP SPECIAL CONFORMATION AND USE. 165. Leaves for Storage. A leaf may at the same time serve both ordinary and special uses. Thus in those leaves of Lilies, such as the eommon White Lily, which spring from the bulb, the upper and green part serves for foliage and elaborates nourishment, while the thickened por- tion or bud-scale beneath serves for the storage of this nourishment. The thread-shaped leaf of the Onion ful- fils the same office; and the nourishing matter it prepares is deposited in its sheathing base, forming one of the concentric layers of the onion. When these layers, so thick and succulent, have given up their store to the grow- ing parts within, they are left as thin and dry husks. In a Houseleek, an Aloe or an Agave, the green color of the surface of the fleshy leaf indi- cates that it is doing the work of foliage ; the deeper-seated white por- tion within is the storehouse of the nourishment which the green surface has elaborated. So, also, the seed-leaves or cotyledons are commonly used for storage. Some, as in one of the Maples, the Pea, Horse-chestnut, Oak, etc., are for nothing else. Others, as in Beech and in our common Fig. 169. A young Agave Americana, or Century-plant j fleshy-leaved. SECTION 7. J SPECIAL LEAVES. 63 Beans, give faint indications of service as foliage also, chiefly in vain. Still others, as in the Pumpkin and Flax, having served for storage, develop into the firsl efficient foliage. Compare 11, 22-30, and the accompanying figures. 16G. Leaves as Bud-Scales serve to protect the forming parts within Hav- ing fulfilled this purpose they commonly fall off when the shoot develops and foliage-leaves appear. Occasionally, as in Fig. 170, there is a transition of bud- scales to leaves, which reveals the nature of the former. The Lilac also shows a gradation from bud-scale to simple leal*. In Cornus florida (the Flowering Dog- wood), the four bud-scales which through the winter protecl the head of forming flowers remain until blossoming, and then the base of each grows out into Fio. 170. Series of bud-scales and foliage-leaves from a developing bud of the Low Sweet Buckeye t&culufl parviflora), showing nearly complete gradation, from a scale to a compound leaf of five leaflets; and that the scales answer to reduced petioles. Fiu. 171. Shoot of common Barberry, showing transition of foliage-leaves to •nines. 04 LEAVES. [SECTION 7. a large and very showy petal-like leaf ; the original dry scale is apparent ill the notch at the apex. 167. Leaves as Spines occur in several plants. A familiar instance is that of the common Barberry (Fig. 171)- In almost any summer shoot, most of the gradations may be seen between the ordinary leaves, with sharp bristly teeth, and leaves which are reduced to a branching spine or thorn. The fact that the spines of the Barberry produce a leaf-bud in their axil also proves them to be leaves. 168. Leaves for Climbing are various in adaptation. True foliage- leaves serve this purpose ; as in Gloriosa, where the attenuated tip of a sim- ple leaf (otherwise like that of a Lily) hooks around a supporting object ; or in Solanum jasminoides of the gardens (Fig. 172), and in Maurandia, etc., where the leaf-stalk coils round and clings to a support ; or in the compound leaves of Clematis and of Adlumia, in which both the leaflets and their stalks hook or coil around the support. 169. Or in a compound leaf, as in the Pea and most Vetches, and in Cobaea, while the lower leaflets serve for foliage, some of the uppermost are developed as tendrils for climbing (Fig. 167). In the common Pea this is so with all but one or two pairs of leaflets. 170. In one European Vetch, the leaflets are wanting and the whole petiole is a tendril, while the stipules become the only foliage (Fig. 173). 171. Leaves as Pitchers, or hollow tubes, are familiar in the common Pitcher-plant or Side-saddle Flower (Sarracenia, Fig. 174) of our bogs. These pitchers are generally half full of water, in which flies and other in- sects are drowned, often in such numbers as to make a rich manure for the plant. More curious are some of the southern species of Sarracenia, which seem to be specially adapted to the capture and destruction of flies and other insects. Fig. 172. Leaves of Solanum jasminoides, the petiole adapted for climbing. Fig. 173. Leaf of Lathyrus Aphaca, consisting of a pair of stipules and a tendril. SECTION 7.] SPECIAL LEAVES. C5 172. The leaf of Nepenthes (Fig. 175) combines three structures and uses. The expanded part below is foliage: this tapers into a tendril for Iusects are caught, and per- climbing ; and this bears a pitcher with a lid. haps digested, in the pitcher. 173. Leaves as Fly-traps. Insects are caught in another way, and more expertly, by the most extraordinary of all the plants of this country, the Diousea or Venus's Fly- trap, which grows in the sandy bogs around Wilmington, North Carolina. Here (Fig. 170) each leaf bears at its summit an appen- dage which opens and shuts, in shape some- thing like a steel-trap, and operating much like one. For when open, no sooner does a lly alight on its surface, and brush against any one of the two or three bristles thai grow there, than the trap suddenly closes, captur- ing the intruder. If the fly escapes, the trap soon slowly opens, and is ready for another capture. When retained, the insect is after a time moistened by a secretion from mi- nute glands of the inner surface, and is digested. In the various species of Drosera or Sundew, insects are caught Flo. 174. Leaf of Sarracenia purpurea, entire, and another with the upper part cut off. Fio. 17a. Leaf of Nepenthes; foliage, tendril, and pitcher combined. Fig 17b\ Leaves of Dionaca; the trap in one of them open, in the others closed. 60 LEAVES. [SECTION 7. by sticking fast to very viscid glands at the tip of strong bristles, aided by adjacent gland-tipped bristles which bend slowly toward the captive. The use of such adaptations and operations may be explained in another place. §3. STIPULES. 174. A leaf complete in its parts consists of blade, leaf-stalk or petiole, and a pair of stipules. But most leaves have either fugacious or minute stipules or none at all; many have no petiole (the blade being sessile or stalkless) ; some have no clear distinction of blade and petiole ; and many of these, such as those of the Onion and all phyllodia (1 66), consist of petiole only. 175. The base of the petiole is apt to be broadened and flattened, sometimes into thin margins, sometimes into a sheath which embraces the stem at the point of attachment. 176. Stipules are such appendages, either wholly or partly separated from the petiole. When quite separate they are said to be free, as in Fig. 112. When attached to the base of the petiole, as in the Rose and in Fig. 177. Leaf of Red Clover: st, stipules, adhering to the base of p, the petiole; b, blade of three leaflets. Fig. 178. Part of stem and leaf of Prince's-Feather (Polygonum orientale) with the united sheathing stipules forming a sheath or ucrea. Fig. 179. Terminal winter bud of Magnolia Umbrella, natural size. 180. Outer- most bud-scale (pair of stipules) detached. SECTION t THEIR ARRANGEMENT. 67 Clover (Fig. 177), they are actuate. When the two stipules unite and sheathe the stem above the insertion, as in Polygonum (Fig. 178), this sheath is called an Ocrea, from its likeness to a greave or leggin. 177. In Grasses, when the sheathing base of the leaf may answer to petiole, the summit of the sheath commonly projects as a thin and short membrane, like an ocrea: this is called a LlGULA or LlGULE. 178. When stipules are green and leaf-like they act as so much foliage. In the Pea they make up no small part of the actual foliage. In a related plant (Lathyrus Aphaca, Fig. 173;, they make the whole of it, the remainder of the leaf being tendril. 179. In many trees the stipules are the bud-scales, as in the Beech, and very conspicuously in the Fig-tree, Tulip-tree, and Magnolia (Fig. 179). These fall off as the leaves unfold. 180. The stipules are spines or prickles in Locusl and several other Leguminous trees and shrubs ; they are tendrils in Smilax. or Greenbrier. § 4. THE ARRANGEMENT OF LEAVES. 181. Phyllotaxy, meaning leaf-arrangement, is the study of the position of leaves, or parts answering to leaves, upon the .si em. 182. The technical name for the attachment of leaves to the stem is the insertion. Leaves (as already noticed, 54) are inserted in three modes. They are Altem ate (Fig. 181), that is, one after another, "i" in other words, with only a single leaf to each mule ; Fit;. 181. Alternate leaves, in Linden, Lime-tree, or Baaswood. Fig. 182. Opposite Leaves, in Red Maple. 68 LEAVES. [SECTION 7. Opposite (Fig. 182), when there is a pair to each node, the two leaves in this case being always on opposite sides of the stem; Whorled or Verticillate (Fig. 183) when there are more than two leaves on a node, in which case they divide the circle equally between them, forming a Verticel or whorl. When there are three leaves in the whorl, the leaves are one third of the circumference apart; when four, one quarter, and so on. So the plan of opposite leaves, which is very common, is merely that of whorled leaves, with the fewest leaves to the whorl, namely, two. 183. In both modes and in all their modifica- tions, the arrangement is such as to distribute the leaves systematically and in a way to give them a good exposure to the light. 184. No two or more leaves ever grow from the same point. The so- called Fu. deled or Clustered leaves are the leaves of a branch the nodes of which are very close, just as they are in the bud, so keeping the leaves in a cluster. This is evident in the Larch (Fig. 184), in which examination shows each cluster to be made up of nume- rous leaves crowded on a spur or short axis. In spring there are only such clusters ; but in summer some of them lengthen into ordinary shoots with scat- tered alternate leaves. So, likewise, each cluster of two or three needle- shaped leaves in Fitch Pines (as in Fig. 185), or of five leaves in White Fine, answers to a similar extremely short branch, springing from the axil of a thin and slender scale, which represents a leaf of the main shoot. For Pines produce two Vv kinds of leaves, — 1. primary, the proper leaves of the shoots, \ not as foliage, but in the shape of delicate scales in spring, which soon fall away ; and 2. secondary, the fascicled leaves, from buds in the axils oi the former, and these form the actual foliage. Fig. 183. Whorled leaves of Galium. Fig. 184. A piece of stem of Larch with two clusters (fascicles) of numerous leaves. Fig. 185. Piece of a branch of Pitch Pine, with three leaves in a fascicle or bun- dle, in the axil of a thin scale which answers to a primary leaf. The bundle is sur- rounded at the base by a short sheath, formed of the delicate scales of the axillary bud. SECTION 7.] THEIR ARRANGEMENT. 69 185. Phyllotaxy of Alternate Leaves. Alternate leaves are distrib- uted along the stem in an order which is uniform for eaeL species. The arrangement in all its modifications is said to be spiral, because, if we draw a line from the insertion (i. e. the |><>int of attachment) of one leaf to that of the next, and so on, this line will wind spirally around the stem as it rises, and in the same species will always bear the same number of leaves for each turn round the stem. That is, any two successive leaves will always be separated from each other by an equal portion of the circum- ference of the stem. The distance in height between any two leaves may vary greatly, even on the same shoot, for that depends upon the length of the internodes, or spaces between the leaves ; but the distance as measured around the circumference (in other words, the Angular Divergence, or angle formed by any two successive leaves) is uniformly the same. 186. Two-ranked. The greatest possible di- vergence is, of course, where the second leaf stands on exactly the opposite side of the stem from the first, the third on the side opposite the second, and therefore over the first, and the fourth over the second. This brings all the leaves into two ranks, one on one side of the stem and one on the other, and is therefore called the Two-ranked arrangement. It occurs in all Grasses, — in Indian Corn, for in- stance; also, in the Basswood (Fig. 1S1). This is the simplest of all arrangements, and the one which most widely distributes successive leaves, but which therefore gives the fewest vertical ranks. Next is the 187. Three-ranked arrangement, — that of all Sedges, and of White Hellebore. Here the second leaf is placed one third of the way round the stem, the third leaf two thirds of the way round, the fourth leaf accordingly directly over the first, the fifth over the second, and so on. That is, three leaves occur in each turn round the stem, and they are separated from each other by one third of the circumference. (Fig. 186, 187.) 188. Five-ranked is the next in the scries, and the most common. It is seen in the Apple (Fig. 188), Cherry, Poplar, and the greater number of trees and shrubs. In this ease the line traced from leaf to leaf will pass twice round the stein before it reaches a leaf Fig. 180. Three-ranked arrangement, shown in a piece of the stalk of a Sedge, with the leaves cut oft' above thru baooa ; the lew ea are numbered in order, from 1 toft. 187. Diagram or cross-section of the same, in one plane; the leaves simi- larly numbered ; showing two cycles of three. 70 LEAVES. [SECTION 7. Tins situated directly over any below (Fig. 189). Here the sixth leaf is over the first; the leaves stand in five perpendicular ranks, with equal angular distance from each other; and this distance between any two successive leaves is just two fifths of the circumference of the stem. 189. The five-ranked arrangement is expressed by the fractioi fraction denotes the divergence of the successive leaves, i. c. the an- gle they form with each other : the numerator also expresses the num- ber of turns made round the stem by the spiral line in completing one cycle or set of leaves, namely, two ; and the denominator gives the number of leaves in each cy- cle, or the number of perpendic- ular ranks, namely, five. In the same way the fraction -| stands for the two-ranked mode, and J- for the three-ranked : and so these different sorts are expressed by the series of fractions -|, ^, f . Other cases follow in the same numerical progression, the next being the 190. Eight-ranked arrangement. In this the ninth , leaf stands over the first, and three turns are made [ around the stem to reach it; so it is expressed by V the fraction f. This is seen in the Holly, and in the common Plantain. Then comes the 191. Thirteen-ranked arrangement, in which the fourteenth leaf is over the first, after five turns around the stem. The common Houseleek (Fig. 191) is a good example. 192. The series so far, then, is \, J, f, f, T5g; the numerator and the denominator of each fraction being those of the two next preceding ones added together. At this rate the next higher should be ^, then ^f , and so on : and in fact just such cases are met with, and (commonly) no others. These higher sorts are found in the Pine Family, both in the leaves and the cones and in many other plants with small and crowded leaves. But in those the number of the ranks, or of leaves in each cycle, can only rarely Fig. 188. Shoot with its leaves 5-ranked, the sixth leaf over the first ; as in the Apple-tree. Fig. 189. Diagram of this arrangement, with a spiral line drawn from the attach- ment of one leaf to the next, and so on ; the parts on the side turned from the eye are fainter. Fig. 190. A ground-plan of the same; the section of the leaves similarly num- bered ; a dotted line drawn from the edge of one leaf to that of the next marks out the spiral. SECTION 7.] THEIR ARRANGEMENT. 71 <&&&£ be made out by direct inspection. They may be indirectly ascertained, how- ever, by studying the secondary spirals, as they arc called, winch usually become conspicuous, at least two scries of them, one turning to the right and one to the left, as shown in Fig. 191. For an account of the way in which the character of the phyllotaxy may be deduced from the secondary spirals, see Structural Botany, Chapter IV 193. Phyllotaxy of Opposite andwhorled Leaves. This is simple and comparatively uniform. The leaves of each pair or whorl arc placed over 1 lie intervals between those of the preceding, and therefore under the intervals of the pair or whorl next above. The whorls or pairs alternate or cross each other, usually at right angles, that- is, they decussate. Opposite leaves, that is, whorls of two leaves only, are far com- moner than whorls of three or four or more members. This arrangement in successive decussating pairs gives an advantageous distribution on the stem in four verti- cal ranks. Whorls of three give six vertical ranks, and so on. Note that in descriptive botany leaves in whorls of two are simply called opposite leaves ; and that the term verticillate or whorled, is employed only for cases of more than two, unless the latter number is specified. 194. Vernation or Praefoliation, the disposition of the leaf-blades in the bud, comprises two things ; 1st, the way in which each separate leaf is folded, coiled, or packed up in the bud; and 2d, the arrangement of the leaves in the bud with respect to one another. The latter of course depends very much upon the phyllotaxy, i. c. the position and order of the leaves upon the stem. The same terms are used for it as for the arrangement of the leaves of the flower in tin* flower-bud. See, therefore, " Estivation, or Pnefloration." L95. As to eacli leaf separately, it is sometimes straight and open in vernal ion, but more commonly it is cither bent, folded, or rolled up. When the upper part is bent down upon the lower, as the young blade in the Tulip-tree is bent upon the leafstalk, it is said to be Injlexcd or Reclined in vernation. When folded by the midrib so that the two halves an- placed face to face, it is Conduplicate (Fig. 193), as in the Magnolia, the Cherry, and the Oak. When folded back and forth like the plaits of a fan. it is Flo. 191. A young planl of the Houseleek, with tin- leaves (not yel expanded) numbered, and exhibiting the L3-ranked arrangement; and showing secondary spirals. Km. 192 Opposite leaves of Euonymue, or Spindle-tree, showing tlic suo I ossing each uthcr at right angles. 72 FLOWERS. [SECTION 8. Plicate or Plaited (Fig. 194), as in the Maple and Currant. If rolled, it may be so either from the tip downwards, as in Terns and the Sundew (Fig. 197), when in unroll- 193 194 196 ing it resembles the head >^_ A A ^--^^ of a crosier, and is said to /y^ / (t ^^^^\ ^e GwMtoute > or it may be ^£f [/iff CV| Vx2-/7 rolled up parallel with the — ~ axis, either from one edge into a coil, when it is Con- volute (Fig. 195), as in the Apricot and Plum ; or rolled from both edges towards the midrib, — sometimes inwards, when it is Invo- lute (Fig. 198), as in the Violet and Water - Lily ; sometimes outwards, when it is Revolute (Fig. 196), in the Rosemary and Azalea. The figures are diagrams, representing sections through the leaf, in the way they were represented by Linnaeus. 196 Section VII r. FLOWERS. 196. Flowers are for the production of seed (16). Stems and branches, which for a time put forth leaves for vegetation, may at length put forth flowers for reproduction. § 1. POSITION AND ARRANGEMENT OF FLOWERS, OR INFLOR- ESCENCE. 197. Flower-buds appear just where leaf-buds appear; that is, they are either terminal or axillary (47-49). Morphologically, flowers answer to shoots or branches, and their parts to leaves. 198. In the same species the flowers are usually from axillary buds only, or from terminal buds only ; but in some they are both axillary and terminal. 199. Inflorescence, which is the name used by Linnseus to signify mode of flower-arrangement, is accordingly of three classes : namely, Indeterminate^ when the flowers are in the axils of leaves, that is, are from axillary buds; Determinate, when they are from terminal buds, and so terminate a stem or branch ; and Mixed, when these two are combined. 200. Indeterminate Inflorescence (likewise, and for the same reason, called indefinite inflorescence) is so named because, as the flowers all come from axillary buds, the terminal bud may keep on growing and prolong the stem indefinitely. This is so in Moneywort (Fig. 199). SECTION 8.] INFLORESCENCE. 73 201. When flowers thus arise singly from the axils of ordinary leaves, they are axillary and solitary, not collected into flower-clusters. 202. But when several or many flowers are produced near each other, the accompanying leaves are apt to be of smaller size, or of different shape or character : then they are called Bracts, and the flowers thus brought together form a cluster. The kinds of ilower-clusters of the indeterminate class have re- ceived distinct names, according to their form and disposition. They are principally Raceme, Corymb, Umbel, Spike, Head, Spadix, Catkin, and Panicle. 203. In defining these it will be necessary to use some of the following terms of descriptive botany which relate to inflorescence. If a flower is stalkless, i. e. sits directly in the axil or other support, it is said to be sessile. If raised on a naked stalk of its own (as in Fig. 199) it is pedun- culate, and the stalk is a Peduncle. 204. A peduncle on which a flower-cluster is raised is a Common peduncle. That which supports each separate flower of the cluster is a Partial peduncle, and is generally called a Pedicel. The portion of the general stalk along which flowers are disposed is called the Axis of inforescence, or, when covered with sessile flowers, the Rhachis (hack-bone), and sometimes the Receptacle. The leaves of a flower-cluster generally are termed Bracts. But when bracts of different orders are to be distinguished, those on the common pedun- cle or axis, and which have a flower in their axil, keep the name of bracts ; and those on the pedicels or partial flower- stalks, if any, that of Bractlets or Bracteoles. The for- mer is the preferable English name. 205. A Raceme (Fig. 200) is that form of flower-cluster in which the (lowers, each on their own foot-stalk or pedicel, are arranged along the sides of a common stalk or axis of inflorescence ; as in the Lily of the Valley, Currant, Bar- berry, one section of Cherry, etc. Each flower comes from the axil of a small leaf, or bract, which, however, is often so small that it might escape notice, and even sometimes (as in the Mustard Family) disappears altogether. The lowest blossoms of a 200 Fig. 199. Piece of :i flowering-stem of Moneywort (Lysiniachia nummnlariaj with single flowers successively produced in the axils of the leaves, from below upwards, as the stein grows on. Fig. 200 A raceme, with a general peduncle (/>), pedicels (;>'), bracts (l>), and bractlets (6'). Plainly the bracts here answer to the leaves in Fig. 199. 74 FLOWERS. [SECTION 8. raceme are of course the oldest, and therefore open first, and the order of blossoming is ascending from the bottom to the top. The summit, never being stopped by a terminal flower, may go on to grow, and often does so (as in the common Shepherd's Purse), producing lateral flowers one after another for many weeks. 206. A Corymb (Fig. 202) is the same as a raceme, except that it i& flat and broad, cither convex, or level-topped. That is, a raceme becomes a corymb by lengthening the lower pedicels while the uppermost remain shorter. The axis of a corymb is short in proportion to the lower pedicels. By extreme shortening of the axis the corymb may be converted into 207. An Umbel (Fig. 203) as in the Milkweed, a sort of flower-cluster where the pedicels all spring apparently from the same point, from the top of the peduncle, so as to resemble, when spreading, the rays of an umbrella; whence the name. Here the pedicels are sometimes called the Rays of the umbel. And the bracts, when brought in this way into a cluster or circle, form what is called an Involucre. 208. The corymb and the umbel being more or less level- topped, bringing the flowers into a horizontal plane or a con- vex form, the ascending order of development appears as Cen- tripetal. That is, the flowering proceeds from the margin or circumference regularly towards the centre ; the lower flowers of the former answering to the outer ones of the latter. 209. In these three kinds of flower-clusters, the flowers art, raised on conspicuous pedicels (204) or stalks of their own. The shortening of these pedicels, so as to render the flowers sessilb or nearly so, converts a raceme into a Spike, and a corymb or an umbel into a Head. 210. A Spike is a flower-cluster with a more or less length- ened axis, along which the flowers are sessile or nearly so ; as in the Plantain (Fig. 201). 211. A Head (Capitulum) is a round or roundish cluster of flowers, 204 Fro. 201. A raceme. 202. A corymb. 203. An umbel. Fig. 204. Spike of the common Plantain or Ribwort. SECTION 8.] INFLORESCENCE. 75 winch arc sessile on a very short axis or receptacle, as in the Button-ball, Buttou-busli (Fig. 205), and Red Clover. It is just wlial a spike would become if its axis were shortened ; or an shortened until the flowers became sessile. of the Button-bush is naked; but that of the Thistle, of the Dandelion, and the like, is surrounded by empty bracts, which form an Involucre. Two particular forms of the spike and the head have received particular names, namely, the Spadix and.the Catkin. 212. A Spadix is a fleshy spike or head, with small and often imperfect flowers, as in the Calla, Indian Turnip, (Fig. 20G), Sweet Flag, etc. It is commonly surrounded or embraced by a peculiar enveloping leaf, called a Spatiik. 213. A Catkin, or Ament, is the name given to the scaly sort of spike of the Birch (Fig. 207) and Alder, the Willow and Poplar, and one sort of flower-clusters of the Oak, Hickory, and the like, — the so-called Amen- taceous trees. 214 Compound flower-clusters of these kinds are not uncommon. When the stalks which in the sim- ple umbel arc the pedicels of single flowers themselves branch into an umbel, a Compound Umbel is formed. umbel, if its pedicels were all The head Fig. 20a. Head of the Button-bush (Cephalanthus). Fig. 206. Spadix and spatheof the Indian Turnip; the latter cut through below. Fio. 207. Catkin, or Ament, of Birch. 76 FLOWERS. [section 8. This is the inflorescence of Caraway (Fig. 208), Parsnip, and almost all of the great family of Umbelliferous (umbel-bearing) plants. 215. The second- ary or partial umbels of a compound um- bel are Umbellets. When the umbellets are subtended by an involucre, this sec- ondary involucre is called an Involucel. 216. A Compound raceme is a cluster of racemes racemosely arranged, as in Smilacina racemosa. A compound corymb is a corymb some branches of which branch again in the same way, as in Mountain Ash. A compound spike is a spicately disposed cluster of spikes. 217. A Panicle, such as that of Oats and many Grasses, is a compound flower-cluster of a more or less open sort which branches with apparent irregularity, neither into corymbs nor racemes. Tig. 209 repre- sents the simplest panicle. It is, as it were, a raceme of which some of the pedicels have branched so as to bear a few flowers on pedicels of their own, while others remain simple. A compound panicle is one that branches in this way again and again. 218. Determinate Inflorescence is that in which the flowers are from terminal buds. The simplest case is that of a solitary terminal flower, as 209 in Fig. 210. This stops the growth of the stem ; for its terminal bud, be- coming a blossom, can no more lengthen in the manner of a leaf-bud. Any Fig. 208. Compound Umbel of Caraway. Fig. 209. Diagram of a simple panicle. Fig. 210. Diagram of an opposite-leaved plant, with a single terminal flower. 211. Same, with a cyme of three flowers ; a, the first flower, of the main axis; b b, those of branches. 212. Same, with flowers also of the third order, c c. SECTION 8.] INFLORESCENCE. 77 213 further growth must be from axillary buds developing into branches. If such branches are leafy shoots, at length terminated by single blossoms, the inflorescence still consists of solitary flowers at the .summit of stem and branches. But it' the flowering branches hear only bracts in place of ordi- nary leaves, the result is the kind of flower-cluster called 219. A Cyme. This is commonly a ilat -topped or convex flower-cluster, like a corymb, only the blossoms arc from terminal buds. Fig. 211 illustrates the simplest cyme in a plant with oppo- site leaves, namely, with three flowers. The middle flower, a, terminates the stem ; the two others, b b, terminate branches, one from the axil of each of the uppermost leaves ; and being later than the middle one, the flowering proceeds from the centre outwards, or is Centrifugal. This is the opposite of the indeterminate mode, or that where all the flower-buds are axillary. If flowering branches appear from the axils below, the lower ones are the later, so that the order of blossoming continues centrifugal or, which is the same thing, descending, as in Fig. 213, making a sort of reversed raceme or false ra- ceme,— a kind of cluster which is to the true raceme just what the flat cyme is to the corymb. 220. Wherever there are bracts or leaves, buds may be produced from their axils and appear as flowers. Fig. 212 represents the case where the branches, b b, of Fig. 211, each with a pair of small leaves or bracts about their middle, have branched again, and produced the branchlets and flowers c c, on each side. It is the continued repetition of this which forms the full or compound cyme, such as that of the Laures- tinus, Hobble-bush, Dogwood, and Hydrangea (Fig. 214). 221. A Fascicle (meaning a bundle), like that of the Sweet William and Lychnis of the gardens, is only a cyme with the flowers much crowded. 222. A Glomerule is a cyme still more compacted, so as to imitate a head. It may be known from a true head by the flowers not expanding centripetally, that is, not from the circumference towards the centre. 223. The illustrations of determinate or eymose inflorescence have been taken from plants with opposite leaves, which give rise to the most regular cymes. But the Rose, Cinquefoil, Buttercup, etc., with alternate leaves, furnish also good examples of eymose inflorescence. 224. A Cymule (or diminutive cyme) is either a reduced small cyme of few flowers, or a branch of a compound cyme, i. e. a partial cyme. 225. Scorpioidor Helicoid Cymes, of various sorts, are forms of de- terminate inflorescence (often puzzling to the student) in which one half of the ramification fails to appear. So that they may be called incomplete cy>//<'s. The commoner forms may be understood by comparing a complete FlG. 213. Diagram of a simple cyme in which the axis lengthens, so as to take the form of u raceme. 78 FLOWERS. [SECTION 8, cyme, like that of Fig. 215 with Fig. 216, the diagram of a cyme of an op- posite-leaved plant, having a series of terminal flowers and the axis con- tinued by the development of a branch in the axil of only one of the leaves at each node. The dotted lines on the left indicate the place of the wanting branches, which if present would convert this scorpioid cyme into the complete one of Fig. 215. Fig. 217 is a diagram of similar inflorescence with alternate leaves. Both are kinds of false racemes (219). When the bracts are also wanting in such cases, as in many Borragineous plants, the true nature of the in- florescence is very much disguised. Fig. 214. Compound cyme of Hydrangea arborescens, with neutral enlarged flowers round the circumference. Fig. '215. A complete forking cyme of an Arenaria, or Chickweed. Fig. 216. Diagram of a scorpioid cyme, with opposite leaves or bracts. Fig. 21 7» Diagram of analogous scorpioid cyme, with alternate leaves or bracts. SECTION 8.] ORGANS OF THE FLOWER. 79 220. These distinctions between determinate and indeterminate inflores- cence, between corymbs and Cjmes, and between the true and the false raceme and spike, were not recognized by botauists much more than half a century ago, and even now arc not always attended to in descriptions. It is still usual and convenient to describe rounded or flat-topped and open ramification as corymbose, even when essentially cymose; also to call the reversed or false racemes or spikes by these (strictly incorrect) names. ■2-27. Mixed Inflorescence is that in which the two plans are mixed or combined in compound clusters. A mixed panicle is one in which, while the primary ramification is of the indeterminate order, the secondary or ultimate is wholly or partly of the determinate order. A contracted or elongated inflorescence of this sort is called a Thyrsus. Lilac and Horse- chestnut afford common examples of mixed inflorescence of this sort. "When loose and open such flower-clusters are called by the general name of Panicles. The heads of Composite are centripetal; but the branches or peduucles which bear the heads are usually of centrifugal order. §2. PARTS OR ORGANS OF THE FLOWER. 228. These were simply indicated in Section II. 16. Some parts are necessary to seed-bearing ; these are Essential Organs, namely, the Stamens and Pistils. Others serve for protection or for attraction, often for both. Such are the leaves of the Flower, or the Floral Envelopes. 229. The Floral Envelopes, taken together, are sometimes called the Perianth, also Perigone, in Latin form Perigonium. In a flower which possesses its full number of organs, the floral envelopes are of two kinds, namely, an outer circle, the Calyx, and an inner, the Corolla. 230. The Calyx is commonly a circle of green or greenish leaves, but not always. It may be the most brightly colored part of the blossom. Each calyx-leaf or piece is called a Sepal. 231. The Corolla is the inner circle of floral envelopes or flower-leaves, usually of delicate texture and colored, that is, of some other color than green. Each corolla-leaf is called a Petal. 232. There are flowers in abundance winch consist wholly of floral envel- opes. Such are the so-called full double flowers, of which the choicer roses and camellias of the cultivator are familiar examples. In them under the gardener's care and selection, petals have taken the place of both stamens and pistils. These are monstrous or unnatural flowers, incapable of pro- ducing seed, and subservient only to human gratification. Their common name of double (lowers is not a sensible one: except that it is lixed by custom, it wen- better to translate their Latin name, floret pleui, and call them full flowers, meaning full of leaves. 233. Moreover, certain plants regularly produce neutral flowers^ consist- ing of floral envelopes only. In Fig 214, some are seen around the margin 80 FLOWERS. [SECTION 8. of the cyme in Hydrangea. They are likewise familiar in the Hobble-bush and in Wild-Cranberry tree, Viburnum Oxycoccus ; where they form an attractive setting to the cluster of small and comparatively inconspicuous 218 perfect flowers which they adorn. In the Guelder Rose, or Snow-ball of ornamental cultivation, all or most of the blossoms of this same shrub are transformed into neutral flowers. 234. The Essential Organs are likewise of two kinds, placed one above or within the other ; namely, first, the Stamens or fertilizing organs, and second, the Pistils, which are to be fertilized and bear the seeds. 235. A Stamen consists of two parts, namely, the Filament or stalk (Fig. 219 a), and the Anther {b). The latter is the only essential part. It is a case, commonly with two lobes or cells, each opening lengthwise by a slit, at the proper time, and discharging a powder or dust- like substance, usually of a yellow color. This powder is the Pollen, or fertilizing matter, to produce, which is the office of the stamen. 236. A Pistil (Fig. 220, 221) when complete, has three parts; Ovary, Style, and Stigma. The Ovary, at base, is the hollow portion, which con- tains one or more Ovules or rudimentary seeds. The Style is the tapering 219 Fig. 218. Aflosplenus, namely, a full double flower of Rose. "Fig. 219. A stamen : a, filament : b, anther, discharging pollen. Fig. 220. A pistil; with ovary, a, half cut away, to show the contained ovules ; bf style; c, stigma. SECTION 8.] PLAN OF THE FLOWER. 81 portion above : the Stigma is a portion of the style, usually its moist naked surface, upon which grains of pollen may lodge and adhere, and thence make a growth which ex- tends down to the ovules. When there is no style then the stigma occupies the tip of the ovary. 237 . The Torus or Receptacle is the end of the flower-stalk, or the portion of axis or stem out of which the several organs of the flower grow, upon which they are borne (Fig. 223). 238. The parts of the flower are thus disposed ou the receptacle or axis essentially as are leaves upon a very short stem ; first the sepals, or outer floral leaves ; then the petals or inner floral leaves; then the stamens; lastly, at summit or centre, the pistils, when there are two or more of them, or the single pistil, when only one. Fig. 223 shows the organs displayed, two of each kind, of such a simple and symmetrical flower as that of a Sedum or Stonecrop, Fig. 222. t i j > , with § 3. PLAN OF FLOWER. 239. All flowers are formed upon one general plan, but with almost in- finite variations, and many disguises. This common plan is best understood by taking for a type, or standard for comparison, some perfect, complete, 22.1 regular, and symmetrical blossom, and one as simple as such a blossom could well he. Flowers are said to be Perfect (hermaphrodite), when provided with both kinds of essential or- gans, i. e. with both stamens and pistils. Complete, when, besides, they have the two sets of floral envelopes, namely, Fio. 221. Model of a simple pistil, with ovary cut across and slightly opened ventrally, to show the ovules and their attachment. Fro. 222. Flower of Sedum ternatnm, a stonecrop. Pig. 228. Parts of same, two of each kind, separated ami displayed ; the torus or receptacle in the centre; a, a sepal ; h, a petal ; c, a stamen ; , pistillate flower. Fio. 281, staminate, and 232, pistillate flower of Moonseed. 86 FLOWERS. [SECTION 8. 2yy 250. A blossom having stamens and no pistil is a Staminate or Male flower. Sometimes it is called a Sterile flower, not appropriately, for other flowers may equally be sterile. One having pistil but no stamens is a Pistillate, or Female flower. 251. Incomplete Flowers are so named in contradistinction to complete : they want either one or both of the floral envelopes. Those of Fig. 230 are incomplete, having ca- Jyx but no corolla. So is the flower of Anem- one (Fig. 233), although rj its calyx is colored like a corolla. The flowers of Saururus or Lizard's-tail, although perfect, have neither calyx nor corolla (Fig. 234). Incomplete flowers, accordingly, are Naked or Achlamydeous, destitute of both floral en- velopes, as in Fig. 234, or Apetalous, when wanting only the corolla. The case of corolla present and calyx wholly wanting is extremely rare, although there are seeming instances. In fact, a single or simple perianth is taken to be a calyx, unless the absence or abortion of a calyx can be made evident. 252. In contradistinction to regular and symmetrical, very many flowers are Irregular, that is, with the members of some or all of the floral circles unequal or dissim- ilar, and Unsymmetrical, that is, when the circles of the flower or some of them differ in the num- ber of their members. (Sym- metrical and unsymmetrical are used in a different sense in some recent books, but the older use should be adhered to.) Want of numerical symmetry and irregularity commonly go to- gether; and both are common. Indeed, few flowers are entirely Fig. 233. Flower of Anemone Pennsylvania; apetalous, hermaphrodite. Fiq. 234. Flower of Saururus or Lizard's-tail ; naked, but hermaphrodite. Fig. 235. Flower of Mustard. 236. Its stamens and pistil separate and enlarged. Fig. 237. Flower of a Violet. 238. Its calyx and corolla displayed: the five smaller parts are the sepals; the five intervening larger ones are the petals. SECTION 8.] MODIFICATIONS OF THE TYPE. 87 symmetrical beyond calyx, corolla, and perhaps stamens ; and probably no irregular blossoms are quite symmetrica]. 253. Irregular and Unsymmetrical Flowers may therefore be illus- trated together, beginning with cases which are comparatively free from other complications. The blossom of Mustard, and of all the very natural family which it represents (Fig. 235, 236), is regular but unsymmetrical in the stamens. There are four equal sepals, four equal petals ; but six stamens, and only two members in the pistil, which for the present may Fio. 239. Flower of a Larkspur. 240. Its calyx ami corolla displayed ; the five larger parts are the Bepals; the four smaller, of two shapes, are tli<' petals; the place of the fifth petal is vacant. 241. Diagram of the same; the place for the missing petal marked by a dotted line. Fio. 242. FlowerofaMonksh 1. 24S. Its parts displayed; five sepals, the up- per Forming the hood; the two lateral alike, broad and flat ; the two lower small. The two pieces under the hood represent the corolla, reduced to two odd-shaped petals; in centre the numerous stamens and three pistils. 244. Diagram of the calyx and corolla; the three dotted lines in the place of missing petals. 88 FLOWERS. [SECTION 8. be left out of view. The want of symmetry is in the stamens. These are in two circles, an outer and an inner. The outer circle consists of two stamens only; the inner has its proper number of four. The flower of Violet, which is on the plan of five, is symmetrical in calyx, corolla, and stamens, inas- much as each of these circles consists of five members ; but it is conspicu- ously irregular in the corolla, one of the petals being very different from the rest. 254. The flowers of Larkspur, and of Monkshood or Aconite, which are nearly related, are both strikingly irregular in calyx and corolla, and con- siderably unsymmetrical. In Larkspur (Fig. 239-241) the irregular calyx consists of five sepals, one of which, larger than the rest, is prolonged be- hind into a large sac or spur ; but the corolla is of only four petals (of two shapes), — the fifth, needed to complete the symmetry, being left out. And the Monkshood (Fig. 242-244) has five very dissimilar sepals, and a corolla of only two very small and curiously-shaped petals, — the three needed to make up the symmetry being left out. The stamens in both are out of symmetry with the ground-plan, being numerous. So are the pistils, which are usually diminished to three, sometimes to two or to one. 255. Flowers with Multiplication of Parts are very common. The stamens are indefinitely numerous in Larkspur and in Monkshood (Fig. 242, 243), while the pistils are fewer than the ground-plan suggests. Most Cactus -flowers have all the orgaus much in- creased in number (Fig. 229), and so of the Water-Lily. In Anemone (Fig. 233) the stamens and pistils are multiplied while the petals are left out. In Buttercups or Crowfoot, while the sepals and petals conform to the ground-plan of five, both stamens and pistils are indefi- nitely multiplied (Fig. 245). 256. Flowers modified by Union of Parts, so that these parts more or less lose the appearance of separate leaves or other orgaus growing out of the end of the stem or receptacle, are extremely common. There are two kinds of such union, namely : — Coalescence of parts of the same circle by their contiguous margins; and Adnation, or the union of adjacent circles or unlike parts. 257. Coalescence is not rare in leaves, as in the upper pairs of Honey- suckles, Fig. 163. It may all the more be expected in the crowded circles or whorls of flower-leaves. Datura or Stramonium (Fig. 246) shows this coalescence both in calyx and corolla, the five sepals and the five petals be- ing thus united to near their tips, eacli into a tube or long and narrow cup. These unions make needful the following terms : — Fig. 245. Flower of Ranunculus bulbosus, or Buttercup, in section. SECTION 8.] MODIFICATIONS OF THE TYPE. 89 Gamopetalous, said of a corolla the petals of which arc thus coalescent into one body, whether only at base or higher. The union may extend to the very summit, as in Morning Glory and the like (Fig. 247), so that the number of petals iu it may not be apparent. The old name for this was Monopetalous, but that means "one-pctalled ; " while gamopetalous means " petals united," and therefore is the proper term. Polypetalous is the counterpart term, to denote a corolla of distinct, that is, separate petals. As it means " many petalled," it is not the best possible name, but it is the old one and in almost universal use. Gamosepalous applies to the calyx when the sepals are in this way united. Polysepalons, to the calyx when of sepa- rate sepals or calyx-leaves. 258. Degree of union or of separation in descriptive botany is expressed in the same way as is the lobing of leaves (139). See Fig. 249-253, and the explanations. 259. A corolla when gamopetalous com- monly shows a distinction (well marked in Fig. 249-251) between a contracted tubular portion below, the Tube, and the spread- ing part above, the Border or Limb. The junction between tube and limb, or a more or less enlarged upper portion of the tube between the two, is the Throat. The same is true of the calyx. 260. Some names arc given to partic- ular forms of the gamopetalous corolla, applicable also to a gamosepalous calyx, such as Wheel -shaped, or Rotate ; when spread- ing out at once, without a tube or with a very short one, something in the shape of a wheel or of its diverging spokes, Fig- 252 253. Salver-shaped, or Salrer-form ; when a flat-spreading border is raised on -~~"—^ >/.»>»»*& Flo. 246. Plowerof Datura Strain mi, Raiuoaepalous and gamopetalona Fio. '217. Funnelform corolla of a common Morning Glory, detached from it.- polysepalous calyx. 90 FLOWERS. [SECTION 8. a narrow tube, from which it diverges at right angles, like the salver rep- resented in old pictures, with a slender handle beneath, Fig. 249-251, 255. Bell-shaped, or Campanula te ; where a short and broad tube widens upward, in the shape of a bell, as in Fig. 254. Funnel-shaped, or Funnel-form ; grad- ually spreading at the summit of a tube which is narrow below, hi the 257 258 shape of a funnel or tunnel, as in the corolla of the common Morning Glory (Fig. 247) and of the Stramonium (Fig. 246). Fig. 248. Polypetalous corolla of Soapwort, of five petals with long claws or stalk-like bases. Fig. 249. Flower of Standing Cypress (Gilia coronopifolia); gamopetalous: the tube answering to the long claws in 248, except that they are coalescent: the limb or border (the spreading part above) is five-parted, that is, the petals not there united except at very base. Fig. 250. Flower of Cypress-vine (Ipomoea Quamoclit); like preceding, but limb five-hbed. Fig. 251. Flower of Ipomoea coccinea; limb almost entire. Fig. 252. Wheel-shaped or rotate and five-parted corolla of Bittersweet, Solanum Dulcamara. 253. Wheel-shaped and five-lobed corolla of Potato. Fig. 254, Flower of a Campanula or Harebell, with a campanulate or bell-shaped corolla; 255, of a Phlox, with salver-shaped corolla; 256, of Dead-Nettie (Lamium), with labiate ringent (or gaping) corolla; 257, of Snapdragon, with labiate person- ate corolla; 258, of Toad-Flax, with a similar corolla spurred at the base. SECTION 8.] MODIFICATIONS OF THE TYPE. yl Tubular ; when prolonged into a tube, with little or no spreading at the border, as in the corolla of the Trumpel Honeysuckle, the calyx of Stra- monium (Fig. 2 16 ). etc. 261. Although sepals and petals are usually all blade, or lamina (123), like a senile leaf, yet they may have a contracted and stalk-like base, an- BWering tO petiole. This is called its Claw, in Latin Unguis. I rngmieu- late petals are universal and. strongly marked in the Pink tribe, as in Soapwort (Kg. 248). 262. Such petals, and various others, may have an outgrowth of the in- ner face into an appendage or fringe, as in Soapwort, and in Sileiie (Fig. 259), where it is at the junction of claw and blade. This is called a Crown, or Corona. In Passion- flowers (Fig. 2G0) the crown consists of numerous threads on the base of each petal. 203. Irregular Flowers may be polypetalous, or nearly so, as in the papilionaceous corolla; but most of them are irregular through coales- cence, -which often much disguises the numerical symmetry also. As affecting the corolla the following forms have received particular names : 264. Papilionaceous Corolla, Fig. 261, 262. This is polypetalous, except that two of the petals cohere, usually but slightly. It belongs only to the Leguminous or Pulse family. The name means butterfly-like; but the likeness is hardly obvious. The names of the five petals of the papilionaceous corolla are curiously incongruous. They are, Fig. 'Jf''.). Unguiculate (clawed) petal of a Silene; with a two-parted crown. Fi<;. 260. A small Passion-flower, with crown of slender threads. Pro. 261. FYonl view of a papilionaceous corolla. 262. The parts of the Bame, displayed: s, Standard, or W-xillum ; u\ Wings, or Ahv ; k, Keel, or Carina. 92 FLOWERS. [SECTION 8. The Standard or Banner (JTexilluni), the large upper petal which is external in the bud and wrapped urouud the others. The Wings {Aloe), the pair of side petals, of quite different shape from the standard. The Keel {Carina), the two lower and usually smallest petals ; these are lightly coalescent into a body which bears some likeness, not to the keel, but to the prow of a boat ; and this encloses the stamens and pistil. A Pea-blossom is a typical example ; the present illustration is from a species of Locust, Robinia hispida. 265. Labiate Corolla (Fig. 256-258), which would more properly have been called Bilabiate, that is, two-lipped. This is a common form of gamopetalous co- rolla ; and the calyx is often bilabiate also. These flowers are all on the plan of five ; and the irregularity in the corolla is owing to unequal union of the petals as well as to diversity of form. The two petals of the upper or posterior side of the flower unite with each other higher up than with the lateral petals (in Fig. 256, quite to the top), forming the Upper lip : the lateral and the lower similarly unite to form the Lower lip. The single notch which is generally found at the summit of the upper lip, and the two notches of the lower lip, or in other words the two lobes of the upper and the three of the lower lip, reveal the real composition. So also does the alternation of these five parts with those of the calyx outside. When the calyx is also bilabiate, as in the Sage, this alternation gives three lobes or sepals to the upper and two to the lower lip. Two forms of the labiate corolla have been desig- nated, viz. : — Ringent or Gaping, when the orifice is wide open, as in Fig. 256. Personate or Masked, when a protube- rance or intrusion of the base of the lower lip (called a Palate) projects over or closes the orifice, as in Snapdragon and Toad-Flax, Fig. 257, 258. Fig. 263. Corolla of a purple Gerardia laid open, showing the four stamens ; the cross shows where the fifth stamen would be, if present. Fig. 264. Corolla, laid open, and stamens of Pentstemon grandiflorus, with a sterile filament in the place of the fifth stamen, and representing it. Fig. 265. Corolla of Catalpa laid open, displaying two good stamens and three abortive ones or vestiges. SECTION 8.] MODIFICATIONS OF THE TYPE. 93 266. There are all gradations between labiate and regular corollas. In those of Gerardia, of some species of Pentstemon, and of Catalpa (Fig. 263-265), the labiate character is slight, but is manifest on close inspection. In almost all such flowers tin; plan of* live, which is obvious or ascertain- able in the calyx and corolla, is obscured in the stamens by the abortion or suppression of one or three of their number. 867. Ligulate Corolla. The ligulate or Strap-shaped corolla mainly belongs to the family of Composite, in winch numerous small flowers are gathered into a head, within an involucre that imitates a calyx. It is best exemplified in the Dandelion and in Chiccory (Fig. 266). Each one of these straps or Ligules, looking like so many petals, is the corolla of a dis- tinct flower: the base is a short tube, which opens out into the ligole: the Ave minute teeth at the end indicate the number of constitnenl petals. So this is a kind of sramopetaloua corolla, which is open along one side nearly Fig. 266. Two flower-heads of Chiccory. Fig. -JG7. One <>i" them half cut away, better showing some of the flowers. 94 FLOWERS. [SECTION 8. to the base, and outspread. The nature of such a corolla (aud of the sta- mens also, to be explained in the next section) is illustrated by the flowei of a Lobelia, Fig. 285. 268. In Asters, Daisies, Sunflower, Coreopsis (Fig. 268), and the like, only the marginal (or Raj/) corollas are ligulate ; the rest (those of the Disk) are regularly gamopetalous, tubular, and five-lobed at summit ; but they are small and individually inconspicuous, only the ray-Jiowers making a show. In fact, those of Coreopsis and of Sunflower are simply for show, these ray-flowers being not only sterile, but ?ieutral, litJS that is, having neither stamens nor pistil. But in Asters, Daisies, Golden-rods, and the like, these ray-flowers are pistillate and fertile, serving therefore for seed-bearing as well as for show. Let it not be supposed that the show is useless. See Section XIII. 269. Adnation, or Consolidation, is the union of the members of parts belonging to different circles of the flower (256). It is of course under- stood that in this (as likewise in coalescence) the parts are not formed and then conjoined, but are produced in union. They are born united, as the term adnate implies. To illustrate this kind of union, take the accompany- ing series of flowers (Fig. 270-274), shown in vertical section. In the first, Fig. 270, Flax-flower, there is no adnation; sepals, petals, and sta- mens, are free as well as distinct, being separately borne on the receptacle, one circle within or above the next ; only the five pistils have their ovaries coalescent. In Fig. 271, a Cherry-flower, the petals and stamens are borne on the throat of Ihe calyx-tube ; that is, the sepals are coalescent into a cup. and the petals and stamens are adnate to the inner face of this; in other Fig. 268. Head of flowers of a Coreopsis, divided lengthwise. Fig. 269. A slice of the preceding more enlarged, with one tubular perfect flower (a) left, standing on the receptacle, with its bractlet or chaff (!>), one ligulate and neutral ray-flower (cc), and part of another; dd, section of bracts or leaves of the involucre. SECTION 8.] MODIFICATIONS OF THE TYPE. words, the sepals, petals, and stamens are all consolidated up to a certain beight. In Pig. 272 a Purslane-flower, the same parts are adnate to 01 consolidated with the ovary up to its middle. In Fig. 273, a Haw- thorn-flower, the consolidation has extended over the whole ovary ; and petals and stamens are adnate to the calyx still further. In Fig. 274, a Cranberry-blossom, it is the same except that all the parts are free at the same height; all seem to arise from the top of the ovary. 270. In botanical description, to express tersely such differences in the relation of these organs to the pistil, they are said to be Hypogynoua (i. e. under the pis- til) when they are -AX free, that is, not adnate to pistil nor connate with each other, as in Fig. 270. Perigynous (around the pistil) when connate with each other, that is, when petals and stamens are inserted or borne on the calyx, whether as in Cherry-flowers (Fig. 271) they are free from the pistil, or as in Purslane and Hawthorn (Fig. 272, 273) they are also ad- nate below to the ovary. Epigynous (on the ovary) when so adnate that all these parts ap- pear to arise from the very summit of the »vary, as last two terms are not very definitely distinguished. 271. Another and a simpler form of expression is to describe parts of the flower as being Free, when not united with or inserted upon other parts. Distinct, when parts of the same kind are not united. This term is the counterpart of coalescent, as free is the counterpart of adnate. Man) writers use the term "free" indiscriminately for both; but it is better to distinguish them. Fig. 274. The Fio. 270. Flax-flower in ration; the parts nil free,— hypogyuous. Fio. 271. Cherry-flower in section ; petals and stamens adnate to tube of calyx,— perigyiious. Fio. 272. Purslane Rower in section; calyx, petals, rtamens, all adnate to lower hjdf of ovary, perigyuoaa. 90 FLOWERS. [SECTION 8. Connate is a term common for either not free or not distinct, that is, for parts united congenitally, whether of same or of different kinds. Adnate, as properly used, relates to the union of dissimilar parts. 272. In still another form of ex- pression, the terms superior and inferior have been much used in the sense of above and below. Superior is said of the ovary of Flax-flower, Cherry, etc., because above the other parts; it is equiv- alent to "ovary free." Or it is said of the calyx, etc., when above the ovary, as in Fig. 273-275. Inferior, when applied to the ovary, means the same as "calyx aduate ; " when applied to the flo- ral envelopes, it means that they are free. 273. Position of Flower or of its Parts. The terms superior and inferior, or upper and lower, are also used to indicate the relative position of the parts of a flower in reference to the axis of inflores- cence. An axillary flower stands between the bract or leaf which sub- tends it and the axis or stem which bears this bract or leaf. This is represented in sectional diagrams (as in Fig. 275, 276) by a transverse line for the bract, and a small circle for the axis of inflorescence. Now the side of the blossom which faces the bract is the Anterior, or Inferior, or Lower side ; while the side next the axis is the Posterior, or Superior, or Upper side of the flower. 274. So, in the labiate corolla (Fig. 256-258), the lip which is composed of three of the five petals is the anterior, or inferior, or lower lip; the other is the posterior, or superior, or upper lip. 275 Fig. 273. Hawthorn-blossom in section ; parts adnate to whole face of ovaTy, and with each other beyond; another grade of perigynous. Fig. 274. Cranberry-blossom in section ; parts epigynous. Fig. 275. Diagram of papilionaceous flower (Robinia, Fig. 261), with bract be- low; axis of inflorescence above. Fio. 276. Diagram of Violet-flower ; showing the relation of parts to bract and axis. SECTION ARRANGEMENTS IN THE BUD. 97 875. In Violets (Fig. 238, 276), the odd sepal is posterior (next the axis) ; the odd petal is therefore auterior, or next the subtending Leaf. In the papilionaceous flower (Fig.261,and diagram, Fig 275), the odd sepal is anterior, and s<> two sepals are posterior; consequently, l>.v the alternation, the odd petal (the standard) is posterioror upper, and the two petals form- ing the keel are anterior or lower. <^*v § 5. ARRANGEMENT OF PARTS IN THE BUD. 276. JEstivation was the fanciful name given by Linnaeus to denote the disposition of the parts, especially the leaves of the flower, before An- thesis, i. e. before the blossom opens. Prajloration, a better term, is some- times used. This is of importance in distinguishing different families or genera of plants, being generally uniform in each. The aestivation is best seen by making a slice across the (lower-bud ; and it may be expressed in diagrams, as in the accompanying figures. 277. The pieces of the calyx or the corolla either overlap each other in the bud, or they do not. When they do not overlap, the aestivation is Falcate, when the pieces meet each other by their abrupt edges, without any infolding or overlapping; as the calyx of the Linden or Basswood (Fig. 277). Induplieate, which is valvate with the margins of each piece projecting inwards, as in the calyx of a common Virgin's-bower, Fig. 278, or Involute, which is the same but the margins rolled inward, as in most of the large-flowered species of Clematis, Fig. 279. Reduplicate, a rarer modification of valvate, is similar but with margins projecting outward. Open, the parts not touching in the bud, as the calyx of Mignonette. 278. When the pieces overlap in the bad, it is in one of two ways; either every piece has one edge in and one edge out, or some pieces are wholly outside and others wholly inside. In the first case the aestivation is Convolute, also named Contorted or Twisted, as in Fig. 280. a eross-sec- (ion of a corolla very Btrongly thus convolute or rolled up together, and in the corolla of a Flax-flower (Kg. 281), where the petals only moderately overlap in this way. Here one edge of every petal covers the next before 277 Fio. 277. Diagram of a flower of Linden, showing the calyx valvate and corolla imbricate m the bud, etc Fig. '27b. Valvate-indnplicate estivation of calyx of common Virgin's-bower. Fig. 279. Valvate-involute estivation of same in Vine-bower, Clematis Yitialla. 98 STAMENS. [SECTION 9. 280 it, while its other edge is covered by the next behind it. The other mode is the Lubricate or Imbricated, in which the outer parts cover or overlap the inner so as to " break joints," like tiles or shingles on a roof ; whence the name. When the parts are three, the first or outermost is wholly external, the third wholly internal, the second has one margin covered by the first while the other overlaps the third or innermost piece : this is the arrangement of alternate three- ranked leaves (187). When there are five pieces, as in the corolla of Fig. 225, and calyx of Fig. 281, as also of Fig. 241, 276, two are external, two are internal, and one (the third in the spiral) has one edge covered by the outermost, while its other edge covers the in- nermost; which is just the five-ranked arrangement of alternate leaves (IS 8). When the pieces are four, two are outer and two are inner; which answers to the ar- rangement of opposite leaves. 279. The imbricate and the convolute modes some- times vary one into the other, especially in the corolla. 280. In a gamopetalous corolla or gamosepalous calyx, the shape of the tube in the bud may sometimes be notice- able. It may be Plicate or Plaited, that is, folded lengthwise ; and the plaits may either be turned outwards, forming projecting ridges, as in the corolla of Campanula; or turned in- wards, as in that of Gentian Belladonna; or Supervolute, when the plaits are convolutely wrapped round each other, as in the corolla of Morning Glory and of Stramonium, Fiff. 282. 'Section IX. STAMENS IN PARTICULAR. 281. Androecium is a technical name for the stamiuate system of a flower (that is, for the stamens taken together), which it is sometimes con- venient to use. The preceding section has dealt with modifications of the flower pertaining mainly to calyx and corolla. Those relating to the sta- mens are now to be indicated. First as to Fig. 280. Convolute aestivation, as in the corolla-lobes of Oleander. Fig. 281. Diagram of a Flax-flower ; calyx imbricated and corolla convolute in the bud. Fig. 282. Upper part of corolla of Datura Stramonium in the bud ; and below a section showing the convolution of the plaits. SECTION 9.] STAMENS. 99 all which is ex- 282. Insertion, or place of attachment. The stamens usually go with the petals. Not rarely they are a1 base Epipctaluns, that is, inserted on (or adnate to) the corolla, as in Fig. 283. When free from the corolla, they may be HjpogyHOUS, inserted on the receptacle under the pistil or gynoecium. r>ric/!/>ious, inserted on the calyx, that is, with the lower part of filament adnate to the calyx-tube. 283 Epitjynom, home apparently on the top of the ovary plained in Fig. 270-271. Gynandrous is another term relating to insertion of rarer occurrence, that is, where the stamens are inserted on (in other words, adnate to) the style, as in Lady's Slipper (Fig. 281), and in the Orchis family generally. 283. In Relation to each Other, stamens are more com- monly Distinct, that, is, without any union with each other. But when united, the following technical terms of long use indicate their modes of mutual connection : — Monadelphous (from two Greek words, meaning when united by their filaments into one set, usually into a ring or cup below, or into a tube, as in the Mallow Family (Fig. 286), the Passion- flower (Fig. 260), the Lupine (Fig. 287), and in Lobelia (Fig 285) Viadelphous (meaning in two brotherhoods), when united by the fila- ments into two sets, as in the Pea and most of its near relatives (Fig. 288 . usually nine in one set, and one in the other. Triadelphous (three brotherhoods), when the filaments are united in three sets or clusters, as in most species of Hypericum. •>4 in one brotherhood "), Km. 283. Corolla of Moniinir ('.lory laid open, to show the five atamena inserted on it. Dear tin- base, Yu.. 284. Style of a Lady's Slipper (Cypripediom), and stamens united with it ; ", ", tin- anthers <>t' the two good ntameus; st, an abortive stamen, what should I"- its anther changed into a petal-like body ; rtig, the atigma. Pio. 285. Plowerof Lobelia cardinalis, Cardinal Bower; corolla making approach tu the ligulate form; filaments (st) monadelphous, and anthers (a) syugeuesious. 100 STAMENS. [SECTION 9. Pentadelphous (five brotherhoods), when in five sets, as in some species of Hypericum and in American Linden (Fig. 277, 289). Polyadelphous (many or several brotherhoods) is the term generally employed when these sets are several, or even more than two, and the par- ticular number is left unspecified. These terms all relate to the fila- ments. Syngenesious is the term to denote that stamens have their anthers united, coalescent into a ring or tube ; as in Lobelia (Fig. 285), in Violets, and in all of the great family of Compositae. 284. Their Number in a flower is commonly expressed directly, but sometimes adjectively, by a series of terms which were the name of classes in the Linnsean artificial system, of which the following names, as also the preceding, are a survival : — Monandrous, i. e. solitary-stamened, when the flower has only one stamen, Diandrous, when it has two stamens only, Triandrous, when it has three stamens, Tetrandrous, when it has four stamens, Penta?idrous, when it has five stamens, Hexandrous, when with six stamens, and so on to Polyandrous, when it has many stamens, or more than a dozen. 285. For which terms, see the Glossary. They are all Greek numerals prefixed to -andria (from the Greek), which Linnaeus used for andrcecium, and are made into an English adjective, -androus. Two other terms, of same origin, designate particular cases of number (four or six) in con- nection with unequal length. Namely, the stamens are Didynamous, when, being only four, they form two pairs, one pair longer than the other, as in the Trumpet Creeper, in Gerardia (Fig. 203), etc. Fig. 286. Flower of a Mallow, with calyx and corolla nut away ; showing rnona- delphous stamens. Fig. 287. Monadelphous stamens of Lupine. 288. Diadelphous stamens (9 and 1) of a Pea-blossom. Fig. 289. One of the five stamen-clnsters of the flower of American Linden, with accompanying scale. The five clusters are shown in section in the diagram of this flower, Fig. 277. Fig. 290. Five syngenesious stamens of a Coreopsis. 291. Same, with tube laid open and displayed. SECTION 9.] ANTHERS. 101 TetratfynamouS) when, being only six, four of them surpass the other two, as in the Mustard-flower and all the Cruciferous family, Fig. 235. 28G. The Filament is a kind of stalk to the anther, commonlv slender or thread-like : it is to the anther neatly what the petiole is to the blade of a leaf. Therefore it is not an essential part. Asa leaf may be without a stalk, so the anther may be Sessile, or without a filament. 287. The Anther is the essential part of the stamen. It is a sort of case, tilled with a tine powder, tin- Pollen, which serves to fertilize the pis- til, so that it may perfect seeds. The anther is said to be Innate (as in Fig. 292), when it is attached by its base to the very apex of the filament, turning neither inward nor outward ; Ail/utle (as in Fig. 293). when attached as it were by one face, usually for its whole length, to the side of a continuation of the filament ; and Versatile (as in Fig. 291), when fixed by or near its middle only to the very point of the filament, so as to swing loosely, as in the Lily, in Grasses, etc. Versatile or ad- nate anthers are Lifrorse, or Incumbent, when facing in- ward, that is, toward the centre of the flow- er, as in Magnolia, Water-Lily, etc. Ext rone, when facing outwardly, as in the Tulip-tree. 288. Rarely does a stamen bear any resemblance to a leaf, or even to a petal or flower-leaf. Nevertheless, the botanist's idea of a stamen is that it answers to a leaf developed in a peculiar form and for a special purpose. In the filament lie sees the stalk of the leaf; in the anther, the blade. The blade of a leaf consists of two similar sides ; so the anther consists of two Lobes or Cells, one answering to the left, the other to the right, side of the blade. The two lobes are often connected by a prolongation of the filament, which answers to the midrib of a leaf; this is called the CONNECTIVE. This is conspicuous in Fig. 292, where the connective is so broad that it separates the two cells of the anther to some distance. 289. A simple conception of the morphological relation of an anther to a leaf is given in Fig. 295, an ideal figure, the lower part rep- resenting a stamen with the top of its anther cut away; the upper, the corresponding upper part of a leaf fro.292. Stamen <>f [aopyram, with innate anther. 293. Of Tulip-tree, with adnate (and extrorse) anther. 294. Oi Evening Primrose, with versatile anther. Pro. 295. Diagram of the lower part of an anther, cul across above, and the upper part of a leaf, to show how tin- one answers to the other; the filament t<> petiole, the connective to midrib; the two cells to the right and left halves of the Made. 102 STAMENS. [SECTION 9. 290. So anthers are generally two-celled. But as the pollen begins to form in two parts of each cell (the anterior and the posterior), sometimes these two strata are not confluent, and the anther even at maturity may be four-celled, as in Moonseed (Fig 296) ; or rather, in that case (the word cell being used for each lateral half of the organ), it is two-celled, but the cells bilocel- late. 291. But anthers may become one-celled, and that either by confluence or by suppres- sion. 292. By confluence, when the two cells run together into one, as they nearly do in most species of Pentstemou (Fig. 297), more so in Monarda (Fig. 300), and completely in the Mallow (Fig. 298) and all the Mallow family. Fig. 296. Stamen of Moonseed, with anther cut across; this 4-celled, or rather 4- locellate. Fig. 297. Stamen of Pentstemon pubescens ; the two anther-cells diverging, and almost confluent. Fig. 298. Stamen of Mallow ; the anther supposed to answer to that of Fig. 297, but the cells completely confluent into one. Fig. 299. Stamen of Globe Amaranth ; very short filament bearing a single anther-cell ; it is open from top to bottom, showing the pollen within. Fig. 300-305. Stamens of several plants of the Labiate or Mint Family. Fig. 300. Of a Monarda : the two anther-cells with bases divergent so that they are transverse to the filament, and their contiguous tips confluent, so as to form one cell opening by a continuous line. Fig. 301. Of a Calamintha: the broad connec- tive separating the two cells. Fig. 302. Of a Sage (Salvia Texana ; with long and slender connective resembling forks of the filament, one bearing a good anther-cell; the other an abortive or. poor one. Fig. 303. Another Sage (S. coccinea), with connective longer and more thread-shaped, the lower fork having its anther-cell wholly wanting. FlG. 304. Of a White Sage, Audibertia grandiflora; the lower fork of connective a mere vestige. Fig. 305. Of another White Sage (A. stachy- oides), the lower fork of connective suppressed. SECTION 9.] POLLEN. 103 line along the whole 293. By suppression in certain cases the anther may be reduced to one cell or halved, hi Globe Amaranth (Fig. -2^3) there is a Bingle cell without vestige of any other. Different species of Sage and of the While Sag California show various grades of abortion of one of the auther-cells, along with a singular lengthening of the connective i Fig. 302-305 . 294. The splitting open of an anther for the discharge of its pollen is termed its Dehiscence. 295. As the figures show, this is commonly by length of each cell, either lateral or, when the anthers are extroise, often along the outer face, and when introrse, along the inner face of each cell. Some- times the opening is only by a chink, hole, or pore at the top, as in the Azalea, Py- rola (Fig. 307), etc. ; sometimes a part of the face separates as a sort of trap-door (or valve), hinged at the top, and open- ing to allow the escape of the pollen, as in the Sassafras, Spice-bush, and Barberry (Fig. 308). 296. Pollen. This is the powdery matter, commonly of a yellow color, which tills the cells of the anther, and is discharged during blossoming, O • 309 310 311 after which the stamens generally fall or wither away 812 313 Under the micro- scope it is found to consist of grains, usually round or oval, and all alike in the same species, but very different in different plants. So that the <*P 314 816 316 817 plant may sometimes be recognized from the pollen alone. are shown in the accompanying figures. 818 Several forms Fig. 306. Stamen with tin- usual dehiscence <>r auther down the side of each cell. Fig. 307. Stamen of Pyrola; cells opening by a terminal hole. Fio. 308. Stamen of Barberry; cells of anther each opening by an uplifted valve. Fig. 309. Magnified pollen of a Lily, smooth and oval; 310, of Echino the pestle, ami the perianth around it to the mortar, of the apothecary. 304 A pistil is either simple or compound. It is simple when it answers to a single flower-leaf, compound when it answers to two or three, or a fuller circle <>!' such leaves conjoined. 106 SIMPLE PISTILS. [SECTION 10. 305. Carpels. It is convenient to have a name for each flower-leaf of the gyuoeciuit) ; so it is called a Carpel, in Latin Carpellum or Carpidium. A simple pistil is a carpel. Each component flower-leaf of a compound pistil is likewise a carpel. When a flower has two or more pistils, these of course are simple pistils, that is, separate carpels or pistil-leaves. There may be only a single simple pistil to the flower, as in a Pea or Cherry blossom (Fig. 271) ; there may be two such, as iu many Saxifrages ; or many, as iu the Strawberry. More commonly the single pistil in the centre of a blossom is a compound one. Then there is seldom much difficulty in ascertaining the number of carpels or pistil-leaves that com- pose it. 306. The Simple Pistil, viewed morphologically, answers to a leaf- blade with margins incurved and united where they meet, so forming a closed case or pod (the ovary), and bearing ovules at the suture or junction of these margins : a tapering upper portion with margins similarly inrolled, is supposed to form the style ; and these same margins, exposed at the tip or for a portion of the length, become the stigma. Compare, under this view, the three accompanying figures. 307. So a simple pistil should have a one-celled ovary, only one line of (2jK attachment for the ovules, a single style, cxv_ ^ and a single stigma. Certain variations from this normal condition which some- times occur do not invalidate this mor- phological conception. For instance, the stigma may become two-lobed or two- ridged, because it consists of two leaf- margins, as Fig. 324 shows ; it may W/' become 2-locellate by the turning or grow- ing inward of one of the sutures, so as to divide the cavity. 308. There are two or three terms which primarily relate to the parts of a simple pistil or carpel, and are thence carried on to the compound pistil, viz. : — Ventral Suture, the line which answers to the united margins of the carpel-leaf, therefore naturally called a suture or seam, and the ventral or inner one, because in the circle of carpel-leaves it looks inward or to the centre of the flower. Dorsal Suture is the line down the back of the carpel, answering to Fig. 323. An inrolled small leaf, such as in double-flowered Cherry blossoms is often seen to occupy the place of a pistil. Fig. 324. A simple pistil (of Isopyrum), with ovary cut across ; the inner (ven- tral) face turned toward the eye : the ovules seem to be borne on the ventral suture, answering to leaf-margins : the stigma above seen also to answer to leaf-margins. Fig. 325. Pod or simple pistil of Caltha or Marsh- Marigold, which has opened, and shed its seeds. SECTION 10.] PISTILS. 107 the midrib of the leaf,— no1 a scam therefore ; bul al maturity many fruits, bucIi as pea-pods, open bj this dorsal as well as l>\ the ventral line. Placenta, a name given to the Burface, whatever it be, which bears the ovules and seeds. The name may be needless when the ovules grow directly on the ventral suture, or from its top or bottom ; but when there are many ovules there is usually some expansion of an ovule-bearing or Beed-bearing surface; as is seen in our Mandrake or Podophyllum, Fig. '62(1 309. A Compound Pistil is a combination of two, three, or a greater number of pistil-leaves or carpels in a circle, united into one body, at least 326 327 328 829 by their ovaries. The annexed figures should make it clear. A series of Saxifrages might be selected the gynoccium of which would show every gradation between two simple pistils, or separate carpels, and their com- plete coalescence into one compound and two-celled ovary. Even when the constituent styles and stigmas are completely coalescent into one, the nature of the combination is usually revealed by some external lines or grooves, or (as in Fig. 328-330) by the internal partitions, or the number «if the placent;e. The simplest case of compound pistil is that 310. With two or more Cells and Axile Placentae, namely, with as many cells as there arc carpels, that have united to compose the organ. Fio. 326. simple pistil of Podophyllum, cut across. Bhowing ovules borne on placenta. Wiq, :vi7. Pistil of a Saxifrage, of two simple carpels or pistil-leaves, united at the base only, cul across both above and below. Fio. 328. Compound S-carpellary pistil of common St. JohnVwort, cut across. the three styles separate. Fio. 329. The same of shrubby St. John's-wort ; the three styles as well ai ovaries here united into one. Fio. 380. Compound 8 carpellary pistil of Tradescantia orSpiderworl ; the three stigmas as well as styles and ovary completely cualescent into one. 108 COMPOUND PISTILS. [SECTION 10. 332 Such a pistil is just what would be formed if the simple pistils (two, three, or five iu a circle, as the case may be), like those of a Paeony or Stonecrop (Fig. 224, 225), pressed together in the centre of the flower, were to cohere by their contiguous parts. In such a case the placentae are naturally axile, or all brought together in the axis or centre ; and the ovary has as many Dissepiments, or internal Partitions, as there are carpels in its composition. For these are the contiguous and coalescent walls or sides of the component carpels. When such pistils ripen into pods, they often separate along these lines into their elementary carpels. 311. One-celled, with free Central Placenta. The commoner case is that of Purslane (Fig. 272) and of the Pink and Chickweed families (Fig. 331, 332). This is ex- plained by supposing that the partitions (such as those of Fig. 329) have early vanished or have been suppressed. In- deed, traces of them may often be detected in Pinks. On the other hand, it is equally supposable that in the Primula family the free central is de- rived from parietal placentation by the carpels bearing ovules only at base, and forming a consolidated common placenta in the axis. Mitella and Dionaea help out this conception. 312. One-celled, with Parietal Placentae. In this not uncommon case it is conceived that the two or three or more carpel-leaves of such a compound pistil coalesce by their adjacent edges, just as sepal-leaves do to form a gamo- sepalous calyx, or petals to form a gamopetalous corolla, and as is shown in the diagram, Fig. 333, and in an actual cross-sec- tion, Fig. 334. Here each carpel is an open leaf, or with some introflexion, bearing ovules along its margins; and each placenta consists of the con- Fig. 331, 332. Pistil of a Sandwort, with vertical and transverse section of the ovary : free central placenta. Fig. 333. Plan of a one-celled ovary of three carpel -leaves, with parietal pla- centae, cut across below, where it is complete; the upper part showing the top of the three leaves it is composed of, approaching, but not united. Fig. 334. Cross section of the ovary of Frost- weed (Helianthemum), with three parietal placentae, hearing ovules. Fig. 335. Cross section of an ovary of Hypericum graveolens, the three large pla- centae meeting in the centre, so as to form a three-celled ovary. 336. Same in fruit, the placenta; new separate and rounded. SECTION 10.] PISTILS. 109 tiguous margins of two pistil-leaved grown together. There is every grada- tion between this and the three-celled ovary with the placenta; in the axis, even in the same genus, sometimes even in dill'erent stages in the same pistil (Fig. 335, 330). § 2. GYMNOSPERMOU8 GYXCECIUM. 313. The ordinary pistil has a closed ovary, and accordingly the pollen can act upon the contained ovules only indirectly, through the stigma. This is expressed in a term of Greek derivation, viz. : — Angiotpermou*, meaning that the seeds are borne in a sac or closed vessel. The counterpart term is Oymnospermous, meaning naked-seeded. This kind of pistil, or gynoe- cium, the simplest of all, yet the most peculiar, characterizes the Pine family and its relatives. 314. While the ordinary simple pistil is conceived by the botanist to be a leaf rolled together into a closed pod (30G), those of the Pine, Larch (Fig. 337), Cedar, and Arbor- Vita (Fig. 338, 339) are open leaves, in the form of scales, each bearing two or more ovules on the inner face, next the base. At the time 337 of blossoming, these pistil-leaves of the young cone diverge, and the pollen, so abundantly shed from the stara- inate blossoms, falls directly upon the exposed ovules. Afterward the scales close over each other until the seeds are ripe. Then I hey sepa- rate that the seeds may be shed. As the pollen acts directly on the ovules, such pistil (or organ acting as pistil) lias no stigma. 315. In the Yew, and in Torreya and Gingko, the gyncecium is reduced to extremest simplicity, that is, to a naked ovule, without any visible carpel. 316. In Cycas the large naked ovules are borne on the margins or lobes of an obvious open leaf. plants have other peculiarities, also distinguishing Angiospermous plants. All Gymnospermots them, as a (lass, from Fig. 337. A pistil, that is, a scale of the cone, of a Larch, at the tunc of Dower- ing; inside view, showing its pair <>f naked ovules. Pig. 33S. Branchlet of the American Arbor-Vita, considerably larger than in nature, terminated by its pistillate Rowers, each consisting "f :i single scale (an open pistil), together forming a small cone. Pro. 339. One of the scales or carpels <>f the last, removed and more enlarged, the inside exposed to view, showing ;i pair of ovules ou its base* 110 OVULES. [SECTION 11. Section XL OVULES. 317. Ovule (from the Latin, meaning a little egg) is the technical name of that which in the flower answers to and becomes the seed. 318. Ovules are naked in gymnospermous plants (as just described) ; in all others they are enclosed in the ovary. They may be produced along the whole length of the cell or cells of the ovary, and then they are apt to be numerous ; or only from some part of it, generally the top or the bottom. In this case they are usually few or single (solitary, as in Fig. 34-1-343). They may be sessile, i. e. without stalk, or they may be attached by a distinct stalk, the Funicle or Funiculus (Fig. 340). 319. Considered as to their position and direction in the ovary, they are Horizontal, when they are neither turned upward nor downward, as in Podophyllum (Fig. 326) ; Ascending, when rising obliquely upwards, usually from the side of the cell, not from its very base, as in the But- tercup (Fig. 341), and the Purslane (Fig. 272); Erect, when rising upright from the very base of the cell, as in the Buck- wheat; (Fig. 342) ; Pendulous, when hauging from the side or from near the top, as in the Flax (Fig. 270) ; and Suspended, when hanging perpendicularly from the very summit of the cell, as in the Anemone (Fig. 343). All these terms equally apply to seeds. 320. In structure an ovule is a pulpy mass of tissue, usually with one or two coats or coverings. The following parts are to be noted ; viz : — Kernel or Nucleus, the body of the ovule. In the Mistletoe and some related plants, there is only this nucleus, the coats being wanting. Teguments, or coats, sometimes only one, more commonly two. When two, one has been called Primine, the other Secundine. It will serve all purposes to call them simply outer and inner ovule-coats. Orifice, or Foramen, an opening through the coats at the organic apex of the ovule. In the seed it is Micropt/le. Ciialaza, the place where the coats and the kernel of the ovule blend. Hilum, the place of junction of the funiculus with the body of the ovule. Frc 340. A cluster of ovules, pendulous on their fnnicles. Fig. 341. Section of the ovary of a Buttercup, lengthwise, showing its ascending ovule. Fig. 342. Section of the ovary of Buckwheat, showing the erect ovule. Fig. 343. Section of the ovary of Anemone, showing its suspended ovule. SECTION 11.] OVULES. Ill 381. The Kinds of Ovules. The ovules in their growth develop in three or four different ways, and thereby are distinguished into Orthotropous or Straight, those which develop without curving or turn- 345 ing, as In Fig. 344. The chalaza is at the insertion or base ; the foramen or oritice is at the apex. This is the simplest, but the least common kind of ovule. Campylotropous or Incurved, in whicb, by the greater growtli of one side, the ovule curves into a kidney-shaped outline, so bringing the oritice down close to the base or chalaza; as in Fig. 345. Amphitropom or Half-Inverted, Fig. 346. Here the forming ovule, instead of curving perceptibly, keeps its axis nearly straight, and, as it grows, turns round upon its base so far as to become transverse to its funiculus, and adnate to its upper part for some distance. Therefore in this case the attachment of the funiculus or stalk is about the middle, the chal- aza is at one end, the oritice at the other. Anatropous or Inverted, as in Fig. 347, the com- monest kind, so called because in its growth it has as it were turned over upon its stalk, to which it has continued adnate. The organic base, or chalaza, thus becomes the apparent summit, and the •Soo Fig. 344. Orthotropous ovule of Buckwheat : c, hilum and chalaza; /. orifice. Fn;. 345. Campylotropoua ovule ofa < Ihickweed : e, hilum and chalaza ; /. oritice. Fio. 346. Amphitropous ovule of Mallow:/, orifice; a, hilum; r, rhaphe; c, chalaza. Fn;. 847. Anatropous ovule of a Viold : the parts lettered as in the last. Kiu. 348-350. Three early stages in the growth of ovule of a Magnolia, showing the forming outer and inner coats, which, even in the later figure have not yet completely enclosed the nucleus ; 851, further advanced, and 852, completely ana- tropous ovule. Fio. 858. Longitudinal section, and 854, transverse section of 862. Fio. 865. Same as 863, enlarged, showing the parts in section : a, outer coat; 6, inner co*t; c, nucleus; d, rhaphe. 112 THE RECEPTACLE. [SECTION 12. orifice is at the base, by the side of the hilum or place of attachment. The aduate portion of the funiculus, which appears as a ridge or cord extending from the hilum to the chalaza, and which distinguishes this kind of ovule, is called the Rhaphe. The amphitropous ovule (Fig. 346) has a short or incomplete rhaphe. 322. Tig. 348-352 show the stages through which an ovule becomes anatropous in the course, of its growth. The annexed two figures are sec- tions of such an ovule at maturity ; and Fig. 355 is Fig. 353 enlarged, with the parts lettered. Section XII. MODIFICATIONS OF THE RECEPTACLE. 323. The Torus or Receptacle of the flower (237, Fig. 223) is the por- tion which belongs to the stem or axis. In all preceding illustrations it is small and short. But it sometimes lengthens, sometimes thickens or vari- ously enlarges, and takes on various forms. Some of these have received special names, very few of which are in common use. A lengthened por- tion of the receptacle is called A Stipe. This name, which means simply a trunk or stalk, is used in 358 359 botany for various stalks, even for the leaf-stalk in Ferns. It is also applied to the stalk or petiole of a carpel, in the rare cases when there is any, as in Fig. 356. Longitudinal section of flower of Silene Pennsylvania, showing stipe between calyx and corolla. Fig. 357. Flower of a Cleome of the section Gynandropsis, showing broadened receptacle to bear petals, lengthened stipe below the stamens, and another between these and pistil. Fig. 358. Pistil of Geranium or Cranesbill. Fig. 359. The same, ripe, with the five carpels splitting away from the long beak (carpophore), and hanging from its top by their recurving styles. SECTION 12.] THE RECEPTACLE. 113 Goldthread. Then ft is technically distinguished as a Thecapuobe. When there is a stalk, or lengthened internode of receptacle, directly under a compound pistil, as in Stanleys and Borne other Crucifere, ii is called a Gtnophobe. When the stalk is developed below the stamens, as in must species of Silenc (Fig. 350), it lias been called an AiJTHOPHORE or GOKO« PHOES. Ill Fig. 357 the toniS is dilated above the Calyx where it hears the petals, then there is a bug mternode (gonophore) betweeu it and the stamens; then a shorter one (gynophore) between these and the pistil. 324. A Carpophore is a prolongation of receptacle or axis between the carpels and bearing them. Umbelliferous plants and Geranium (Fig. 358, 359) afford characteristic examples. 325. Flowers with very numerous simple pistils generally have the re- ceptacle enlarged so as to give them room ; sometimes becoming broad and ilat, as in the Flowering Raspberry, sometimes elongated, as in the Black- 360 361 362 berry, the Magnolia, etc. It is the receptacle in the Strawberry (Fig. 3G0), much enlarged and pulpy when ripe, which forms the eatable part of the fruit, and bears the small seed-like pistils on its surface. In the Rose (Fig. 361), instead of being convex or conical, the receptacle is deeply concave, or urn-shaped. Indeed, a Rose-hip may be likened to a straw- berry turned inside out, like the finger of a glove reversed, and the whole covered by the adherent tube of the calyx. The calyx remains beneath in the strawberry. 326. In Nelumbium, of the Water-Lily family, the singu- lar and greatly enlarged receptacle is shaped like a top, and bears the small pistils immersed in separate cavities of its Ilat upper surface (Fig. 362). 327. A Disk is an enlarged low receptacle or an out- growth from it, hypogt/nous when underneath the pistil, as in Rue and the Orange i Fig. 363), and pertgynout Trheo adnate to calyx-tube (as in Buckthorn, Fig. 301, 305), and Cherry (Kg- •j;i)j 0r Flo. 360. Longitudinal section of a young strawberry, enlarged. Fig. 861. Similar section of a young Rose-hip, Fn;. 362. Enlarged and top-shaped receptacle of Nelumbium, at maturity. Fig. '606. llypogynous disk in Orange. 868 114 FERTILIZATION. [SECTION 13. to both calyx-tube and ovary, as in Hawthorn (Fig. 273). A flattened hypogynous disk, underlying the ovary or ovaries, and from which they fall away at maturity, is sometimes called a Gynobase, as in the Rue family. In some Borragineous flowers, such as Houndstongue, the gynobase runs up in the centre between the carpels into a carpophore. The so-called epigynous disk (or Stylopodiumj crowning the summit of the ovary in flowers of Umbelliferse, etc., cannot be said to belong to the receptacle. Section XIII. FERTILIZATION. 328. The end of the flower is attained when the ovules become seeds. A flower remains for a certain time (longer or shorter according to the species) in anthesis, that is, in the proper state for the fulfilment of this end. During anthesis, the ovules have to be fertilized by tlie pollen ; or at least some pollen has to reach the stigma, or in gymnospermy the ovule itself, and to set up the peculiar growth upon its moist and permeable tis- sue, which has for result the production of an embryo in the ovules. By this the ovules are said to be fertilized. The first step is pollination, or, so to say, the sowing of the proper pollen upon the stigma, where it is to germinate. § 1. ADAPTATIONS FOR POLLINATION OF THE STIGMA. 329. These various and ever-interesting adaptations and processes are illustrated in the "Botanical Text Book, Structural Botany," chap. VI. sect, iv., also in a brief and simple way in " Botany for Young People, How Plants Behave." So mere outlines only are given here. 330. Sometimes the application of pollen to the stigma is left to chance, as in dioecious wind-fertilized flowers ; sometimes it is rendered very sure, as in flowers that are fertilized in the bud ; sometimes the pollen is prevented from reaching the stigma of the same flower, although placed very near to it, but then there are always arrangements for its transference to the stigma of some other blossom of the kind. It is among these last that the most, exquisite adaptations are met with. 331. Accordingly, some flowers are particularly adapted to close or self fertilization ; others to cross fertilization ; some for either, according to circumstances. Fig. 364. Flower of a Buckthorn showing a conspicuous perigynous disk. Fig. 365. Vertical section of same flower. SECTION 13.] FERTILIZATION. 115 dose Fertilization occurs when the pollen reaches and acts upon a stigma of the vitv same flower (tins is also called self-fertilization), or, less closely, upon other blossoms of the same cluster or the Bame individual plant. Gross Fertilization occurs when ovules are fertilized by pollen of other individuals of the same species. Hybridization occurs when ovules are fertilized by pollen of some other (necessarily some nearly related) species. 332. Close Fertilization would seem to he the natural result in ordi- nary hermaphrodite flowers; bul it is by no means so in all of them. More commonly the arrangements are such that it takes place only alter some opportunity for cross fertilization has been afforded. But close fertiliza- tion is inevitable in what arc called Cleistogamous Flowers, thai is, in those which are fertilized in the flower- bud, while still unopened. Most ilowers of this kind, indeed, never open at all; but the closed floral coverings arc forced off by the growth of the precociously fertilized pistil. Common examples of this are found in the earlier blossoms of Specularia perfoliata, in the later ones of most Violets, es- pecially the stemless species, in our wild Jewel weeds or Impatiens, in the subterranean shoots of Amphicai |uea. Every plant which produces these cleistogamous or bud-fertilized Ilowers bears also more conspicuous and open flowers, usually of bright colors. The latter very commonly fail to set seed, but the former are prolific. 333. Cross Fertilization is naturally provided for in dioecious plants (2-19), is much favored in monoecious plants (319), and hardly less so in dichogamous and in heterogonous flowers (338). Cross fertilization depends upon the transportation of pollen ; and the two principal agents of convey- ance arc winds and insects. Most ilowers are in their whole structure adapted either to the one or to the other. 334. Wind-fertilizable or Anemophilous flowers are more commonly dioecious or monoecious, as in Pines and all coniferous trees, Oaks, and Birches, and Sedges; yet sometimes hermaphrodite, as in Plantains and most Grasses; they produce a superabundance of very tighl pollen, adapt.. 1 to be wind-borne; and they offer neither nectar to teed winged insects, nor fragrance nor bright colors to attract them. 335. Insect-fertilizable or Entomophilous flowers are those which arc SOUghl by insects, for pollen or for nectar, or for both. Through then- visits pollen is conveyed from one flower and from one plan! to another. bisects are attracted to such blossoms by their bright colors, or their fra- grance, or by the nectar (the material of honey) there provided for them. While supplying their own needs, they carry pollen from anthers to stigmas and from plant to plant, thus bringing about a certain amount ofcrotfl fer- tilization. Willows and some other diCBCiouS flowers are so fertilized, chiefly by bees. Bul most insect-visited flowers have the stamens and pis- tils associated eit her iii the same or in Contiguous blossoms Kveu when in the same blossom, anthers and stigmas arc very commonly so situated 116 FERTILIZATION. [SECTION 13. that under insect-visitation, some pollen is more likely to be deposited upon other than upon own stigmas, so giving a chance for cross as well as for close fertilization. On the other hand, numerous flowers, of very various kinds, have their parts so arranged that they must almost necessarily be cross- fertilized or be barren, and are therefore dependent upon the aid of insects. This aid is secured by different exquisite adaptations and contrivances, which would need a volume for full illustration. Indeed, there is a good number of volumes devoted to this subject.1 336. Some of the adaptations which favor or ensure cross fertilization are peculiar to the particular kind of blossom. Orchids, Milkweeds, Kal- mia, Iris, and papilionaceous flowers each have their own special contriv- ances, quite different for each. 337. Irregular flowers (253) and especially irregular corollas are usu- ally adaptations to insect-visitation. So are all Nectaries, whether hollow spurs, sacs, or other concavities in which nectar is secreted, and all nectar- iferous glands. 338. Moreover, there are two arrangements for cross fertilization com- mon to hermaphrodite flowers in various different families of plants, which have received special names, Dichogamy and Heterogony . 339. Dichogamy is the commoner case. Flowers are dichogamous when the anthers discharge their pollen either before or after the stigmas of that flower are in a condition to receive it. Such flowers are Proterandrous, when the anthers are earlier than the stigmas, as in Gen- tians, Campanula, Epilobium, etc. P rote rogy nous, when the stigmas are mature and moistened for the re- ception of pollen, before the anthers of that blossom are ready to supply it, and are withered before that pollen can be supplied. Plantains or Ribworts (mostly wind-fertilized) are strikingly proterogynous : so is Amor- pha, our Papaws, Scrophularia, and in a less degree the blossom of Pears, Hawthorns, and Horse-chestnut. 340. In Sabbatia, the large-flowered species of Epilobium, and strikingly in Clerodendron, the dichogamy is supplemented and perfected by move- ments of the stamens and style, one or both, adjusted to make sure of cross fertilization. 341. Heterogony. This is the case in which hermaphrodite and fer- tile flowers of two sorts are produced on different individuals of the same species ; one sort having higher anthers and lower stigmas, the other hav- ing higher stigmas and lower anthers. Thus reciprocally disposed, a visit- ing insect carries pollen from the high anthers of the one to the high stigma of the other, and from the low anthers of the one to the low stigma of the other. These plants are practically as if dioecious, with the advantage that 1 Beginning with one by C. C. Sprengel in 1793, and again in our day with Darwin, " On the Various Contrivances by which Orchids are fertilized by Insects," and in succeeding works. SECTION 14.] FRUIT. 117 both kinds arc fruitful. Houstonia and Mitehella, or Partridge-berry, are excellent ami familiar examples. The e are cases of Heterogone Dimorphism, the relative Lengths being only .short and long reciprocally. Heterogone Trimorphism, in which there is a mid-length as well as a Long and a short set of stamens and style; occurs in Lythrum Salicariaand some species of Oxalis. 342. There must be some essential advantage in cross fertilization or cross breeding. Otherwise all these various, elaborate, and exquisitely adjusted adaptations would be aimless. Doubtless the advantage is the same as that which is realized in all the higher animals by the distinction of sexes. § 2. ACTION OF POLLEN, AND FORMATION OF THE EMBRYO. 343. Pollen-growth. A grain of pollen may be justly likened to one of the simple bodies (spores) which answer for seeds in Cryptogamous plants. Like one of these, it is capable of germination. When deposited upon the moist surface of the stigma (or in some cases even when at a certain dis- tance) it grows from some point, its living inner coat breaking through the inert outer coat, and protruding in the form of a delicate tube. This as it lengthens penetrates the loose tissue of the stigma and of a loose conduct- ing tissue in the style, feeds upon the nourishing liquid matter there pro- vided, reaches the cavity of the ovary, enters the orifice of an ovule, and attaches its extremity to a sac, or the lining of a definite cavity, in the ovule, called the Embryo-Sac. 344. Origination of the Embryo. A globule )f living matter in the embryo-sac is formed, and is in some way placed in close proximity to the apex of the pollen tube; it probably absorbs the contents of the latter; it then sets up a special growth, and the Embryo (S-1U) or rudimentary plantlet in the seed is the result. Section XIV. THE FRUIT. 345. Its Nature. The ovary matures into the Fruit. In the strictest sense the fruit is the seed-vessel, technically named the Peek iep. But practically it may include other parts organically connected with the peri- carp. Especially the calyx, or a part of it. is often incorporated with the ovary, so as to be undistinguishably a portion of the pericarp, and it even forms along with the receptacle the whole bulk of such edible fruits as apples and pears The receptacle is an obvious part in blackberries, and is the whole edible portion in the strawberry. 346 A.lso a duster of distinct carpels may. in ripening, be consolidated or compacted, so as practically to be taken for one fruit. Bach are nspber- 118 FRUTT. [SECTION 14. ries, blackberries, the Magnolia fruit, etc. Moreover, the ripened product of many flowers may be compacted or grown together so as to form a single compound fruit. 347. Its kinds have therefore to be distinguished. Also various names of common use in descriptive botany have to be mentioned and defined. 348. In respect to composition, accordingly, fruits may be classified into Simple, those which result from the ripening of a single pistil, and con- sist only of the matured ovary, either by itself, as in a cherry, or with calyx-tube completely incorporated with it, as in a gooseberry or cranberry. Aggregate, when a cluster of carpels of the same flower are crowded into a mass ; as in raspberries and blackberries. Accessor// or Anthocarpous, when the surroundings or supports of the pistil make up a part of the mass ; as does the loose calyx changed into a fleshy and berry-like envelope of our Wintergreen (Gaultheria, Fig. 366, 367) and ButFalo- berry, which are otherwise simple fruits. In an aggregate fruit such as the straw- berry the great mass is receptacle (Fig. 360, 368) ; and in the blackberry (Fig. 369) the juicy receptacle forms the central part of the savory mass. Multiple or Collective, when formed from several flowers consolidated into one mass, of which the common receptacle or axis of inflorescence, the floral envelopes, and even the bracts, etc., make a part. A mul- berry (Fig. 408, which superficially much resembles a blackberry) is of this multiple sort. A pine- apple is another ex- ample. 349. In respect to texture or consist- 370 ence, fruits may be distinguished into three kinds, viz. : — Fleshy Fruits, those which are more or less soft and juicy throughout; Fig. 366, Forming fruit (capsule) of Gaultheria, with calyx thickening around its base. 367. Section of same mature, the berry-like calyx nearly enclosing the capsule. Fig. 368. Section of a part of a strawberry. Compare with Fig. 360. Fig. 369. Similar section of part of a blackberry. 370. One of its component simple fruits (drupe) in section, showing the pulp, stone, and contained seed: more enlarged. Compare with Fig. 375. SECTION 14.] FRUIT. 119 Stone Fruits, or Drupaceous, the outer part fleshy like a berry, the inner hard or stony, like a nut ; and Dry Fruits, those which have no flesh or pulp. 350. In reference to the way of disseminating the contained seed, fruits are said to be Indehitcent when they do not open at maturity. Fleshy fruits and stone fruits arc of course iudehisccnt. The seed becomes free only through decay or by being fed upon by animals. Those which escape digestion are thus disseminated by the latter. Of dry fruits many are iudehisccnt ; and these arc variously arranged to be transported by animals. Some burst irregularly ; many arc Dehiscent, that is, they split open regularly along certain lines, and discharge the seeds. A dehiscent fruit almost always contains many or several seeds, or at least more than one seed. 371 372 373 374 351. The principal kinds of fruit which have received substantive names and are of common use in descriptive botany are the following. Of fleshy fruits the leading kind is 352. The Berry, such as the gooseberry and currant, the blueberry and cranberry (Fig. 371), 'he tomato, and the grape. Here the whole flesh is soft throughout. The orange is a berry with a leathery rind. 353. The Pepo, or Gourd -fruit , is a hard-rinded berry, belonging to the Gourd family, such as the pumpkin, squash, cucumber, and melon, Fig. 372. 373. 354. The Pome is a name applied to the apple, pear (Fig. 374), and quince; fleshy fruits, like a berry, but the principal thickness is calyx, only Fhi. 371. Leafy shout and berrj (cut across) «\' the largei Cranberry, Vacdniun] u pon. Fio. 872. Pepo of Gourd, in section. 878, <>n.' < ;ir|>.-l of same in diagram. Fig. 874. Longitudinal and transversa sections of .1 pear (j>oihh). 120 FRUIT. [SECTION 14. the papery pods arranged like a star in the core really belonging to the carpels. The fruit of the Hawthorn is a drupaceous pome, something be- tween pome and drupe. 355. Of fruits which are externally fleshy and internally hard the lead- ing kind is 356. The Drupe, or Stone-fruit ; of which the cherry, plum, and peach (Fig. 375) are familiar examples. In this the outer part of the thickness of the pericarp be- comes fleshy, or softens like a berry, while the inner hardens, like a nut. From the way in which the pistil is constructed, it is evident that the fleshy part here answers to the lower, and the stone to the upper face of the component leaf. The layers or concentric portions of a drupe, or of any pericarp which is thus separable, are named, when thus distinguishable into three portions, — Epicarp, the external layer, often the mere skin of the fruit, Mesocarp, the middle layer, which is commonly the fleshy part, and Endocarp, the innermost layer, the stone. But more commonly only two portions of a drupe are distinguished, and are named, the outer one Sarcocarp or Exocarp, for the flesh, the first name referring to the fleshy character, the second to its being an external layer ; and Putamen or Endocarp, the Stone, within. 357. The typical or true drupe is of a single carpel. But, not to multiply technical names, this name is extended to all such fruits when fleshy without and stony within, although of compound pistil, — even to those having several or separable stones, such as the fruit of Holly. These stones in such drupes, or drupaceous fruits, are called Pyrence, or Nucules, or simply Nutlets of the drupe. 358. Of Dry fruits, there is a greater diversity of kinds hav- ing distinct names. The indehis- cent sorts are commonly one- seeded. 359. The Akene or Ache- nium is a small, dry and indehis- cent one-seeded fruit, often so seed-like in appearance that it is popularly taken for a naked seed, is a good example, Fig. 376, 377. The fruit of the Butter cup or Crowfoot Its nature, as a ripened pistil (in this Fig. 375. Longitudinal section of a peach, showing flesh, stone, and seed. Fig. 376. Akene of a Buttercup. 377. The same, divided lengthwise, to show the contained seed. Fig. 378. Akene of Virgin 's-bower, retaining the feathered style, which aids in dissemination. SECTTOX 14.] FRUTT. 121 case a simple carpel), is apparent by its bearing the remains of a style or stigma, or a sear from winch this lias fallen. It may retain the style and use it in various ways for dissemination (Fig. 378). 360. The fruit of Composite (though not of a single carpel) is also an akene. In this ease the pericarp is invested by an adherent calyx-tube; the limb of which) when it has any, is called the Pants. This name was hist given to the down like that of the Thistle, but is applied to all forms under which the limb of the calyx of the " compound flower" appears. In Lettuce, Dandelion (Pig. 3S4), and the like, the achenium as it matures tapers upwards into a slender beak, like a stalk to the pappus. 361. A Cremocarp (Fig. 385), a name given to the fruit of Umbelli- ferse, consists as it were of a pair of akenes united com- pletely iu the blossom, but splitting apart when ripe into the two closed carpels. Each of these is a Meri- carp or Hemicarp, names seldom used. 362. A Utricle is the same as an akene, but with a thin and bladdery loose pericarp; like that of the Goosefoot or Pigweed (Fig. 3S6). When ripe it may- burst open irregularly to discharge the seed ; or it may open by a circular line all round, the upper part fall- ing off like a lid ; as in the Amaranth (Tig. 387). 363. A Caryopsis, or Grain, is like an akene with the seed adhering to the thin pericarp throughout, so that fruit and seed are incorporated into one body; as in wheat, Indian corn, and other kinds of grain. 36 1 . A Nut is a dry and indehiscent fruit, commonly one-celled and one- 886 Pio. .°«7P. Akene of Mayweed (no pappus). 880. That of Succory (its pappus a shallow cup). 381. Of Sunflower (pappus <>f two deciduous scales). 382. Of Sneezeweed (Helenium), with its pappus of five scales. 383. Of Sow-Thistle, with its pappus of delicate downy hair-. 384. <»f the Dandelion, its pappus raised on a Long beak. Pio. 385. Fruit (cremocarp) "i Osmorrhiza; the two akene-like ripe carpels sej>- arating at maturity from a Blender axis or carpophores. I'ii;. 386. Utricle of the common Pigweed (Cheaopodium album). Fig. 3t<7. Utricle (pyxis) <>t' Amaranth, opening all round (drcumscissile). 122 FRUIT. [SECTION 14. seeded, with a hard, crustaceous, or bony wall, such as the cocoauut, hazel- nut, chestnut, and the acorn (Fig. 37, 388.) Here the involucre, in the form of a cup at the base, is called the Cupule. Iu the Chestnut the cupule forms the bur ; in the Hazel, a leafy husk. 365. A Samara, or Key-fruit, is either a nut or an akeue, or any other iudehiscent fruit, furnished with a wing, like that of Ash (Fig. 389), and Elm (Fig. 390). The Maple-fruit is a pair of keys (Fig. 391). 366. Dehiscent Fruits, or Pods, are of two classes, viz., those of a simple pistil or carpel, and those of a compound pistil. Two common sorts of the first are named as follows : — 367. The Follicle is a fruit of a simple carpel, which dehisces down one side only, i. e. by the inner or ventral suture. The «\ fruits of Marsh Marigold (Fig. 392), Paeony, Larkspur, and Milkweed are of this kind. 368. The Legume or true Pod, such as the peapod (Fig. 393), and the fruit of the Leguminous or Pulse family generally, is one which opens along the dorsal as well as the ventral suture. The two pieces into which it splits are called Valves. A Loment is a legume which is constricted between the seeds, and at length breaks up crosswise into dis- tinct joints, as in Fig. 394. 369. The pods or dehiscent fruits belonging to a compound ovary have several technical names : but they all may be regarded as kinds of 370. The Capsule, the dry and dehiscent fruit of any compound pistil. The capsule may discharge its seeds through chinks or pores, as in the Fig. 388. Nut (acorn) of the Oak, with its cup or cupule. Fig. 389. Samara or key of the White Ash, winged at end. 390. Samara ol the American Elm, winged all round. Fig. 391. Pair of samaras of Sugar Maple. Fig. 392. Follicle of Marsh Marigold (Caltha palustris). Fig. 393. Legume of a Sweet Pea, opened. Fig. 394. Loment or jointed legume of a Tick-Trefoil (Desmodium). SECTION 14.] FRUIT. 123 Poppy, or burs! Irregularly in sonic part, as in Lobelia and the Snapdragon; but commonly il split - open (or \& dehiscent) lengthwise into regular pieces, railed VaLV] 9 371. Regular Dehiscence in a capsule takes place in two ways, which are best illustrated in pods of two or three cells. It is either Loculicidal, or, splitting directly into the loculi or cells, that is, down the hack (or the dorsal suture) of each eell or carpel, as in Iris (Fig. 395) ; or Septicidal, that is, splitting through tin; partitions or septa, as in St. John's- wort ( Pig. 396), Rhododendron, etc. This divides the capsule into its compo- nent carpels, which then open by their ventral suture. 372. In loculicidal dehiscence the valves nat- urally bear the partitions on their middle; in the septicidal, half the thickness of a partition is borne on the margin of each valve. See the annexed diagrams. A variation of either mode occurs when the valves break away from the part it ions, these remaining attached in the axis of the fruit. This is called Septifragal dehiscence. One form is seen in the Morning-Glory (Fig. 400). 373. The capsules of Rue, Spurge, and some others, are both loculi- cidal and septicidal, and so split into half-carpellary valves or pieces. 374. The Silique (Fig. 401) is the technical name of the peculiar pod of the Mustard family ; which is two-celled by a false partition stretched across between two pa- rietal placentae. It generally opens by two valves from below up- ward, and the placentas with the partition are left behind when the valves fall off. I 375. A Silicle or Pouch is only a short and broad silique, like that of the Shepherd's Purse, Fig. 402, 4D3. Fio. 396. Capsule of Iris, with Loculicidal dehiscence; below, cut a Fig. 39»5. Pod of a Marsh St. John'a-wort, with septicidal dehiscence. Fia. 397, 398. Diagrams of the two modes. Fig. 399. Diagram of septifragal dehiscence of the loculicidal type. 400. Same Of the septicidal or margimicidal type. 124 FRUIT. [SECTION 14. 376 upper 401 axis or minute The Pyxis is a pod which opens by a circular horizontal line, the part forming a lid, as in Purslane (Fig. 404), the Plantain, Hen- bane, etc. In these the dehiscence extends all round, or is cir- cumscissile. So it does in Amaranth (Fig. 387), forming a one- seeded utricular pyxis. In Jenersouia, the line does not separate quite round, but leaves a portion for a hinge to the lid. 377. Of Multiple or Collective Fruits, which are properly masses of fruits aggregated into one body (as is seen in the Mulberry (Pig. 408), Pine- apple, etc.), there are two kinds with special names and of pe- culiar structure. 378. The Syconium or Fig- 403 402 404 fruit (Fig. 405, 406) is a fleshy summit of stem, hollowed out, and lined within by a multitude of flowers, the whole becoming pulpy, and in the common fig, luscious. 379. The Strobile or Cone (Pig. 411), is the peculiar multiple fruit of Pines, Cypresses, and the like ; hence named Conifers, viz. cone-bearing Fig. 401. Silique of a Cadamine or Spring Cress. Fig. 402 . Silicle of Shepherd's Purse. 403. Same, with one valve removed. Fig. 404. Pyxis of Purslane, the lid detaching. Fig. 405. A fig-fruit when young. 406. Same in section. 407. Magnified por- tion, a slice, showing some of the flowers. Fig. 408. A mulberry. 409. One of the grains younger, enlarged ; seen to be a pistillate flower with calyx becoming fleshy. 410. Same, with fleshy calyx cut across. SECTION 15.] SEEDS. 125 plants. As already shown (313), these cones are open pistils, mostly in the form of flat scales, regularly overlying each other, and pressed together in a spike or head. Each scale hens one or two naked seeds on its inner luce. When ripe and dry, the scales turn back or diverge, and in the Pine the seed peels oil' and falls, generally carrying with it a wing, a part of the lining of the scale, which facilitates the disper- sion of the seeds by the wind (Fig. 412,413). In Arbor- Vitae, the scales of the small cone are few, and not very unlike the leaves. In Cy- press they are very thick at the top and narrow at the base, so as to make a peculiar sort of closed cone. In Juniper and Red Cedar, the few scales of the, very small cone become fleshy, and ripen into a fruit which closely resembles a berry. Section XV. THE SEED. 380. Seeds are the final product of the flower, to which all its parts and offices are subservient, Like the ovule from which it originates, a seed consists of coats and kernel. 381. The Seed-coats arc commonly two (320), the outer and the inner. Fig. 414 shows the two, in a seed cut through lengthwise. The outer coat is often hard or crustaceous, whence it is called the Testa, or shell of the seed ; the inner is almost al- ways thin and delicate. 382. The shape and the markings, so various in different seeds, depend mostly on the outer coat. Sometimes this fits the kernel closely; sometimes it is expanded into a iring, as in the Trum- pet-Creeper (Fig. 41.")), and occasionally this wing is cut up into shreds or tufts, as in the Catalpa (Fig. 416); or instead of a wing it may bear a Coma, or tuft of long and soft hairs, as in the Milkweed or Silkweed (Fig. 417). The use of wings, or downy tufts is to render the seeds buoyant Fig. HI, Cone of a common Pitch Pine. 412. [nside view of a separated tcalc or open carpel ; one seed in place: 113, the other seed. Fro. 414. Seed of a Linden or Basswood cnt through lengthwise, and magnified, the parts lettered: ". the hilum or scar; b, the outer coat; c, the inner; J, the albumen; e, the embryo. 126 SEEDS. [section 15. for dispersion by the winds. This is clear, not only from their evident adaptation to this purpose, but also from the fact that winged and tufted seeds are found only in fruits that split open at maturity, never in those that remain closed. The coat of some seeds is beset with long hairs or wool. Cotton, one of the most important vege- table products, since it forms the principal clothing of the larger part of the human race, consists of the long and woolly hairs which thickly cover the whole surface of the seed. There are also crests or other appendages of various sorts on certain seeds. A few seeds have an additional, but more or less incomplete covering, out- side of the real seed-coats called an 383. Aril, or Arillus. The loose and transparent bag which encloses the seed of the White Water-Lily (Fig. 418) is of this kind. So is the mace of the nutmeg ; and also the scarlet pulp around the seeds of the Waxwork (Celastrus) and Strawberry-bush (Euonymus). The aril is a growth from the ex- tremity of the seed-stalk, or from the placenta when there is no seed-stalk. 384. A short and thickish appendage at or close to the hilum in certain seeds is called a Caruncle or Strophiole (Fig. 419). 385. The various terms which define the position or direc- tion of the ovule (erect, ascending, etc.) apply equally to the seed : so also the terms anatropous, orthotropous, campylotro- pous, etc., as already defined (320, 321), and such terms as Hilum, or Scar left where the seed-stalk or funiculus falls away, or where the seed was attached directly to the placenta when there is no seed-stalk. Rhaphe, the line or ridge which runs from the hilum to the chalaza in anatropous and amphitropous seeds. Chalaza, the place where the seed-coats and the kernel or nucleus are organically connected, — at the hilum in orthotropous and campylotropous seeds, at the extremity of the rhaphe or tip of the seed in other kinds. Micropyle, answering to the Foramen or orifice of the ovule. Compare the accompanying figures and those of the ovules, Fig. 341-355. Fig. 415. A winged seed of the Trumpet-Creeper. Fio. 416. One of Catalpa, the kernel cut to show the embryo. Fig. 417. Seed of Milkweed, with a Coma or tuft of long silky hairs at one end. Fig. 418. Seed of White Water-Lily, enclosed in its aril. Fig. 419. Seed of Ricinus or Castor-oil plant, with caruncle. SECTION 15.] KMI'.RYO. 127 420 386. The Kernel, or Nucleus, is the whole body of the seed within the coats. In manj seeds I tie ker- nel is all Embryo ; in others a large pari of it is the .//- Lumen. For example, in Fig. 483, it is wholly embryo ; in Fig. 422, all but the small speck (//) is albumen. 387 . The Albumen or Endosperm of the seed is sufficiently charac- terized and its office explained m Sect. 111., 31-35. :^ss. The Embryo or Germ, which is the rudimentary plantlet and the final result of blossoming, and its development in germination have been extensively illustrated in Sections II. and III. Its essential parts are the Radicle and the Cotyledons. 389. Its Radicle or Caulicle (the former is the term long and gener- ally used in botanical descriptions, but the latter is the more correct one, for it is the initial stem, which merely gives origin to the root), as to its position in the seed, always points to and lies near the micropyle. In re- lation to the pericarp it is Superior, when it points to the apex of the fruit or cell, and Inferior, when it points to its base, or downward. 390. The Cotyledons have already been illustrated as re- spects their number, — giving the importaut distinction of Dicoty- ledonous, Polycotyledonous and Monocotyledonous embryos (30— 13), — also as regards their thickness, whether foliaceoua or Jleshy ; and some of the very various shapes and adaptations to the seed have been figured. They may be straight, or folded, or rolled up. In the latter case the cotyledons may be rolled up as it were from one margin, as in Calycanthus (Fig. 424), or from apex to base in a flat spiral, or they may be both folded {pi irate) and rolled up {convolute), as in Sugar Maple (Fig. 11.) In one very natural family, the Crucifenv. two difie rent modes prevail in the way the two cotyledons arc brought round against the radicle. In one series 425 426 they are Fig. 420. Seed of a Violel (anatropons) : a, hilum; 6, rhaphe; <\ ehalam Fio. 421. Seed of a Larkspur (also anatropons); the parts lettered as in the last. Fie. 122. The same, cut through lengthwise: f s transverse slice of stem of Calla Lily. The great spaces arc tubular .iir-eh;umels l.uilt up by the Cttlla. 132 VEGETABLE LIFE AND WORK. [SECTION 16. much thickened aud the calibre small. The protoplasm of each living cell appears to be completely shut up and isolated in its shell of cellulose ; but microscopic investigation has brought to view, in many cases, minute threads of protoplasm which here and there traverse the cell-wall through minute pores, thus connecting the living portion of one cell with that of adjacent cells. (See Fig. 447, &c.) 403. The hairs of plants are cells formed on the surface ; either elongated single cells (like the root-hairs of Fig. 441, 442), or a row of shorter cells. Cotton fibres are long and simple cells grow- ing from the surface of the seed. 404. The size of the cells of which common plants are made up varies from about the thirtieth to the thou- sandth of an inch in diameter. An ordinary size of short or roundish cells is from -g^- to -^ of an inch ; so that there may generally be from 27 to 125 millions of cells in the compass of a cubic inch ! 405. Some parts are built up as a compact structure ; in others cells are arranged so as to build up regular air- "3]rnBt]QC]0( channels, as in the stems of aquatic and other water-loving plants (Fig. 440), or to leave irregular spaces, as in the lower part of most leaves, where the cells only here and there come into close contact (Fig. 443). 406. All such soft cellular tissue, like this of leaves, that of pith, and of the green bark, is called Parenchyma,, while fibrous and woody parts are composed of Pbosen- .r^JL-JL-Jc: chyma, that is, of peculiarly transformed 443 407. Strengthening Cells. Common cellular tissue, which makes up the whole structure of all very young plants, and the whole of Mosses and other vegetables of the lowest grade, even when full grown, is too tender or too brittle to give needful strength and toughness for plants which are to rise to any considerable height and support themselves. In these needful strength is imparted, and the conveyance of sap through the plant is facilitated, by the change, as they are formed, of some cells into thicker- walled and tougher tubes, and by the running together of some of Fig. 441. Much magnified- small portion of young root of a seedling Maple I such as of Fig. 82); and 442; a few cells of same more magnified. The prolonga- tions from the hack of some of the cells are root-hairs. Fig. 44-J. Magnified section through the thickness of a leaf of Florida Star- Anise. SUCTION 16.] ANATOMICAL STI;i (TURE. 133 these, or the prolongation of others, into hollow fibres or tabes of various buso. Two sorts <>l' .such transformed cells ur<> together, and essentially form the Mis. Wood. This is found Lu all common herbs, as well as in shrubs and trees, but the former have much less of it in proportion to the softer cellular tissue. It is formed very early in the growth of the root, stem, anil leaves, — traces of it appearing in large embryos even while yel in the seed. Those cells thai lengtheu, and at the same time chicken their walls form the proper WbODI FlBRB or WOOD-CELLS ; those of larger si/.e and thinner walls, which are thickened only in certain parts SO as to have peculiar markings, and which often are seen to he made up of a row of cylindrical cells, with the partitions between absorbed or bro- ken away, are called DUCT8, or sometimes \ ESSELS. There are all gradations between wood-cells aud ducts, and between both these and common cells. But in most plants the three kinds are fairly distinct. 409. The proper cellular tissue, or paren- chyma, is the ground-work of root, stem, and leaves; this is traversed, chiefly lengthwise, by the strengthening and conducting tissue, wood-cells and duct -cells, in the form of bundles or threads, which, in the stems and stalks of herbs are fewer and comparatively scattered, but in shrubs and trees so numer- rous and crowded that in the stems and all permanent parts they make a solid mass of wood. They extend into and ramify ii the leaves, spreading out in a horizontal plane, as the framework of ribs and veins, which supports the softer cellular portion or parenchyma. 410. Wood-Cells, or Woody Fibres, consist of tubes, commonly between one and two thousandths, but in Pine-wood sometimes two or three hundredths, of an inch in diameter. Those from the tough bark of the BaSSWOod, Fie ill. Magnified wood-cells of tin- bark (bast-cells) of Basswood, one and part "i another. 146. Borne wood-cells from tin- wood (and below part of a duet); and 446, a detached wood-cell <>t' tin- same; equally magnified. Fig. 117. Borne wood-cells from Bnttonwood, Platanus, highly magnified, a whole cell and lower end of another on tin- left ; a cell cut half away lengthwise, and halt of another on the right ; some pores or pits (a) seen on tin- left; while 6 6 mark sections through these on the cut Burface. When living and young the protoplasm extends into these and by minuter perforations connect- across them. In age the pits become open passages, facilitating the pas-a^c of sap and air. m VEGETABLE LIFE AND WORK. [SECTION 16. - 0 , 9 »l 1 G 1 \ @ 1 '■> A| c^ S) 0 n 1 0 Q A 0 9j ©\ (3 9 \ V 0 0 of 0 0 shown in Fig. 444, are only the fifteen-hundredth of an inch wide. Those of Buttonwood (Fig. 447) are larger, and are here highly magnified besides. The figures show the way wood-cells are commonly put together, namely, with their tapering ends overlapping each other, — spliced together, as it were, — thus giving more strength and toughness. In hard woods, such as Hickory and Oak, the walls of these tubes are very thick, as well as dense ; while in soft woods, such as White-Pine and Basswood, they are thinner. 411. Wood-cells in the bark are generally longer, finer, and tougher than those of the proper wood, and appear more like fibres. For example, Fig. 446 represents a cell of the wood of Basswood of average length, and Fig. 444 one (and part of another) of the fibrous bark, both drawn to the same scale. As these long cells form the principal part of fibrous bark, or bast, they are named Bast-cells or Bast-fibres. These give the great tough- ness and flexibility to the inner bark of Basswood (i. e. Bast-wood) and of Leatherwood ; and they furnish the invaluable fibres of flax and hemp ; the proper wood of their stems being tender, brittle, and de- stroyed by the processes which separate for use the tough and slender bast-cells. In Leather- wood (Dirca) the bast-cells are remarkably slender. A view of one, if magnified on the scale of Fig. 444, would be a foot and a half long. 412. The wood-cells of Pines, and more or less of all other Coniferous trees, have on two of their sides very peculiar disk-shaped markings (Fig. 44S-450) by which that kind of wood is recognizable. 413. Ducts, also called Vessels, are mostly larger than wood-cells : indeed, some of them, as in Red Oak, have calibre large enough to be discerned on a cross section by the naked eye. They make the visible porosity of such kinds of wood. This is particularly the case with Dotted ducts (Fig. 451, 452), the surface of which appears as if riddled with round or oval pores. Such ducts are commonly made up of a row oflarge cells more or less confluent into a tube. Scalariform ducts (Fig. 458, 459), common in Ferns, and generally angled by mutual pressure in the bundles, Fig. 448. Magnified bit of a pine-shaving, taken parallel with the silver grain. 449. Separate whole wood-cell, more magnified. 450. Same, still more magnified ; both sections represented : a, disks in section, b, in face. Fig. 451, 452. A large and a smaller dotted duct from Grape-Vine. 448 V 449 SECTION 16.] ANATOMICAL STRUCTURE. 135 have transversely elongated thin places, parallel with each other, giving a ladder-like appearance, whence the name. Annular ducts (Fig. 457) are marked with cross lines or rings, which arc thickened portions of the cell-wall. Spiral ducts or vessels (Fig. 453-455) have thin walls, strengthened by a spiral libre adherent within. This is as delicate and as strong as spider- web : when uncoiled by pulling apart, it tears up and annihilates the cell- wall. The uncoiled threads are seen by gently pulling apart many leaves, such as those of Amaryllis, or the stalk, of a Strawberry leaflet. Laticiferou* ducts, Vessels of the Luffs, or MUk-vesseh are peculiar branching tubes which hold latex or milky juice in certain plant s. It is very difficult to sec them, and more so to make out their nature. They arc peculiar in branching and inosculating tubes, running in among the cellular tissue; and they are very smal except when gorged and old (Fig. 1G0, 4G1). so as to make a net -work of Km. 453, 154. Spiral ducts which uncoil into a Bingle thread. 456. spiral duct whidi tears up as a band. 456. An annular duct, with variations above. 457. Loose spiral dud passing into annular. 4aS. Sealariforni duets of a Kern; part of a bundle, prismatic by pressure. 4.'V.'. One torn into a band. Km. 460. Milk Vessels of Dandelion, with cells of the common cellular tissue. 401. Others from tlu; same older ami gorged with milky juice. All highly mag- nified. 136 VEGETABLE LIFE AND GROWTH. [SECTION 16. § 2. CELL-CONTENTS. 414. The living contents of young and active cells are mainly protoplasm with water or watery sap which this has imbibed. Old and effete cells are often empty of solid matter, containing only water with whatever may be dissolved in it, or air, according to the time and circumstances. All the various products which plants in general elaborate, or which particular plants specially elaborate, out of the common food which they derive from the soil and the air, are contained in the cells, and in the cells they are produced. 415. Sap is a general name for the principal liquid contents, — Crude sap, for that which the plant takes in, Elaborated sap for what it has digested or assimilated. They must be undistinguishably mixed in the cells. 416. Among the solid matters into which cells convert some of their elaborated sap two are general and most important. These are Chlorophyll and Starch. 417. Chlorophyll (meaning leaf-green) is what gives the green color to herbage. It consists of soft grains of rather complex nature, partly wax- like, partly protoplasmic. These abound in the cells of all common leaves and the green rind of plants, wherever exposed to the light. The green color is seen through the transparent skin of the leaf and the walls of the containing cells. Chlorophyll is essential to ordinary assimilation in plants : by its means, under the influence of sunlight, the plant converts crude sap into vegetable matter. 418. Far the largest part of all vegetable matter produced is that which goes to build up the plant's fabric or cellular structure, either directly or indirectly. There is no one good name for this most important product of vegetation. In its final state of cell- walls, the permanent fabric of herb and shrub and tree, it is called Cellulose (408) : in its most soluble form it is Sugar of one or another kind ; in a less soluble form it is Dextrine, a kind of liquefied starch : in the form of solid grains stored up in the cells it is Starch. By a series of slight chemical changes (mainly a variation in the water entering into the composition), one of these forms is converted into another. 419. Starch {Farina or Feculd) is the form in which this common plant material is, as it were, laid by for future use. It consists of solid grains, somewhat different in form in different plants, in size varying from -j^- to ^oo of an inch, partly translucent when wet, and of a pearly lustre. From the concentric lines, which commonly appear under the microscope, the grains seem to be made up of layer over layer. When loose they are com- monly oval, as in potato-starch (Fig. 462) : when much compacted the grains may become angular (Fig. 463). 420. The starch in a potato was produced in the foliage. In the soluble form of dextrine, or that of sugar, it was conveyed through the cells of the herbage and stalks to a subterranean shoot, and there stored up in the SECTION 16.] CELL-CONTKNTS. 137 tuber. When the potato sprouts, the starch in the vicinity of developing buds or eyes is changed back, again, first into mucilaginous dextrine, then into sugar, dissolved in the sap, and in this form it is made to flow to the grow ing parts, where it is laid down into cellulose or cell-wall. 4C2 *■■> 421. Besides these cell-contents which arc in obvious and essential rela- tion to nutrition, there are others the use of which is problematical. Of such the commonest arc •122. Crystals. These when slender or needle-shaped are called Ruapiiides. They are of inorganic matter, usually of oxalate or phosphate or sulphate of lime. Some, at least of the latter, may be direct crystalliza- tions of what is taken in dissolved in the water absorbed, but others must be the result of some elaboration in the plant. Some plants have hardly any ; others abound in them, especially in the foliage and bark. In Locust- bark almost every cell holds a crystal; so that in a square inch not thicker than writing-paper there may be over a million and a half of them. When Fig. 462. Some magnified Btarch-grains, in two cells of a potato. 463. Some cells of tin- albumen <>r floury pari of Indian Corn, filled with starch-grains. Fig. 464. Four cells from dried Onion-peel, each holding a crystal of different shape, one of them twinned. (65. Some *■<-! 1 s from stalk of Rhubarb-plant, three containing chlorophyll ; two (one torn across) with rhaphidea. 466. Rhaphidea in a .ell, from Ariasema, with small cells surrounding. h'>7. Prismatic; crystals from the hark of Hickory. 168. Glomerate crystal in ■ cell, from Beet-root. (69 \ tew cells oi Locust-bark, a crystal in each. 170. A detached cell, with rhaphidea being forced out, a* happens when put in water. 138 VEGETABLE LIFE AND WORK. [SECTION 16. needle-shaped (rhapliides), as in stalks of Calla-Lily, Rhubarb, or Four- o'clock, they are usually packed in sheaf-like bundles. (Fig. 465, 466.) § 3. ANATOMY OF ROOTS AND STEMS. 423. This is so nearly the same that an account of the internal structure of stems may serve for the root also. 424. At the beginning, either in the embryo or in an incipient shoot from a bud, the whole stem is of tender cellular tissue or parenchyma. But wood (consisting of wood-cells and ducts or vessels) begins to be formed in the earliest growth ; and is from the first arranged in two ways, making two general kinds of wood. The difference is obvious even in herbs, but is more conspicuous in the enduring stems of shrubs and trees. 425. On one or the other of these two types the stems of all phanero- gamous plants are constructed. In one, the wood is made up of separate threads, scattered here and there throughout the whole diameter of the stem. In the other, the wood is all collected to form a layer (in a slice across the stem appearing as a ring) between a central cellular part which has none in it, the Pith, and an outer cellular part, the Bark. 426. An Asparagus-shoot and a Corn-stalk for herbs, and a rattan for a woody kind, represent the first kind. To it belong all plants with monocotyledonous em- bryo (40). A Bean-stalk and the stem of any com- mon shrub or tree rep- resent the second ; and to it belong all plants with dicotyledonous or polycotyledonous embryo. The first has been called, not very properly, Endogenous, which means in- side-growing ; the second, properly enough, Exogenous, or outside-growing. 427. Endogenous Stems, those of Monocotyls (10), attain their greatest size and most characteristic development in Palms and Dragon- trees, therefore chiefly in warm climates, although the Palmetto and some Fig. 471. Diagram of structure of Palm or Yucca. 472. Structure of a Corn- stalk, in transverse and longitudinal section. 473. Same of a small Palm-stem. The dots on the cross sections represent cut ends of the woody bundles or thrpads. SECTION 10.] ANATOMY OF STEMS. 139 Yucc;is become trees along the southern borders of the United States. In such .stems the woody bundles arc more numerous ami crowded toward the circumference, and bo the harder wood is outside; while in an exogenous stem the oldest ami hardest wood is toward I he centre. An endogenous stem lias no clear distinction of pith, hark, and wood, concentrically ar- ranged, no silver grain, no annual layers, no hark that peels ofF clean from the wood. Yet old steins of Yuccas and the like, that continue to increase in diameter, do form B sort of layers and a kind of scaly hark when old. Yuccas show well the curving of the woodj bundles (Fig. 471) which below taper out and are lost at the rind. 42S. Exogenous Stems, those of Dicotyls (37), or of plants coming from dicotyledonous and also polycotyledonous embryos, have a structure which is familiar in the wood of our ordinary trees and shrubs. Lt is the same in an herbaceous shoot (such as a Flax-stem, Fig. 471) as in a Maple-stem of the first year's growth, except that the woody layer is com- monly thinner or perhaps reduced to a circle of bundles. It was so in the tree-stem at the beginning. The wood all forms in a cylinder, — in cross section a ring — around a cen- tral cellular part, dividing the cellular core within, the pith, from a cellu- lar bark without. As the wood-bundles increase in number and in size, they press upon each other and become wedcre-shaped in the cross sec- tion; and they continue to grow from the outside, next the bark, so that they become very thin wedges or plates. Between the plates or wedges are very thin plates (in cross section lines) of much compressed cellular tissue, which conned the pith with the bark. The plan of a one-year-old woody stem of this kind is exhibited in the figures, which are essentially diagrams. 420. When such a stem grows on from year to year, it adds annually a Fie. 171. Short piece Of Stem of Flax, magnified, Showing the hark. wood, and pith in a cross section. Fie 175. Diagram of a cross section <>f a very young exogenous stem, showing six woody bundles or wedges. 176 Same later, with wedges increased to twelve. 477. still later, the wedges filling the space, separated only by the thin lines, or medullarv rays, running from pith to bark. 140 VEGETABLE LIFE AND WORK. [SECTION 16. 478 layer of wood outside the preceding one, between that and the bark. This is exogenous growth, or outside-growing, as the name denotes. 430. Some new bark is formed every year, as well as new wood, the former inside, as the latter is outside of that of the year preceding. The ring or zone of tender forming tissue between the bark and the wood has been called the Cambium Layer. Cambium is an old name of the physiologists for nutritive juice. And this thin layer is so gorged with rich nutritive sap when spring growth is re- newed, that the bark then seems to be loose from the wood and a layer of viscid sap (or cambium) to be poured out between the two. But there is all the while a connection of the bark and the wood by delicate cells, rapidly mul- tiplying and growing. 431. The Bark of a year-old stem consists of three parts, more or less distinct, namely, — beginning next the wood, — 1. The Liber or Fibrous Bark, the Inner Bark. This contains some wood-cells, or their equivalent, commonly in the form of bast or bast-cells (411, Fig. 444), such as those of Basswood or Linden, and among herbs those of flax and hemp, which arc spun and woven or made into cordage. It also contains cells which are named sieve-cdls, on account of numerous slits and pores in their walls, by which the protoplasm of contiguous cells communicates. In woody stems, whenever a new layer of wood is formed, some new liber or inner bark is also formed outside of it. 480 Fig. 478. wise. Fig. 479. Fig. 4S0 Piece of a stem of Soft Maple, of a year old, cut crosswise and length- A portion of the same, magnified. A small piece of the same, taken from one side, reaching from the bark to the pith, and highly magnified: a, a small hit of the pith ; b, spiral ducts of what is called the medullary sheath ; c, the wood ; d, d, dotted ducts in the wood ; e, e, annular ducts;/, the liber or inner bark; a, the green bark; h, the corky layer; i, the skin, or epidermis; j, one of the medullary rays, or plates of silver grain, seen on the cross-section. SECTION 10.] ANATOMY OF STEMS. 141 2. The Green Bark or Middle Bark This consists of cellular tissue onlv, ami contains the same green matter (chlorophyll, 417) as the I In woody Btems, before the season's growth is completed, it becomes cov- ered by 3. The Corky Later <»r Outer Bark, the cells of which contain no chlorophyll, and are of the nature of cork. Common cork is the thick corky layer of the bark of the Cork-Oak of Spain. It is this which gives to the stems or twigs of shrubs and trees the aspect and the color peculiar to each, — light gray in the Ash, purple in the Red Maple, red in several 1) igwoods, etc. 4. The Epidermis, or skin of the plant, consisting of a layer of thick- sided empty cells, which may be considered to be the outermost layer, or in most herbaceous stems the only layer, of cork-cells. 432. The green layer of bark seldom grows much after the first season. Sometimes the corky layer grows and forms new layers, inside of the old, for years, as in the Cork-Oak, the Sweet Gum-tree, and the "White and the Paper Birch. But it all dies after a while ; and the continual enlargement of the wood within finally stretches it more than it can bear, and sooner or later cracks and rends it, while the weather acts powerfully upon its sur- face; so the older bark perishes and falls away piecemeal year by year. 433. So on old trunks only the inner bark remains. This is renewed every year from within and so kept alive, while the older and outer layers die, are fissured and rent by the distending trunk, weathered ami worn, and thrown off in fragments, — in some trees slowly, so that the bark of old trunks may acquire great thickness; in others, more rapidly. In Honey- suckles and Grape-Vines, the layers of liber loosen ami die when only a year or two old. The annual layers of liber are sometimes as distinct as those dt' the wood, but often not so. Fio. 181. Magnified view of surface of a bi1 of young Maple wood from which the bark lias been torn away, Bhowing the wood-cells and the baric-ends of medul- lary rays. Pio. 482. Section in the opposite direction, from bark (on the left) to beginning of pith (on the right), and a medullary ray extending from one to the other, 142 VEGETABLE LIFE AND WORK. [SECTION 16. 434. The Wood of an exogenous trunk, having the old growths covered by the new, remains nearly unchanged in age, except from decay. Wherever there is an annual suspension and renewal of growth, as in temperate cli- mates, the annual growths are more or less distinctly marked, in the form of concentric rings on the cross section, so that the age of the tree may be known by counting them. Over twelve hundred layers have been counted on the stumps of Sequoias in California, and it is probable that some trees now living antedate the Christian era. 435. The reason why the annual growths are distinguishable is, that the wood formed at the beginning of the season is more or less different in the size or character of the cells from that of the close. In Oak, Chestnut, etc., the first wood of the season abounds in dotted ducts, the calibre of which is many times greater than that of the proper wood-cells. 436. Sap-wood, or Alburnum. This is the newer wood, living or recently alive, and taking part in the conveyance of sap. Sooner or later, each layer, as it becomes more and more deeply covered by the newer ones and farther from the region of growth, is converted into 437. Heart-wood, or Duramen. This is drier, harder, more solid, ana" much more durable as timber, than sap-wood. It is generally of a different color, and it exhibits in different species the hue peculiar to each, such as reddish in Red-Cedar, brown in Black-Walnut, black in Ebony, etc. The cnange of sap-wood into heart-wood results from the thickening of the walls of the wood-cells by the deposition of hard matter, lining the tubes and diminishing their calibre; and by the deposition of a vegetable coloring- matter peculiar to each species. The heart-wood, being no longer a living part, may decay, and often does so, without the least injury to the tree, except by diminishing the strength of the trunk, and so rendering it more liable to be overthrown. 438. The Living Parts of a Tree, of the exogenous kind, are only these : first, the rootlets at one extremity ; second, the buds and leaves of the season at the other ; and third, a zone consisting of the newest wood and the newest bark, connecting the rootlets with the buds or leaves, how- ever widely separated these may be, — in the tallest trees from two to four hundred feet apart. And these parts of the tree are all renewed every year. No wonder, therefore, that trees may live so long, since they annually re- produce everything that is essential to their life and growth, and since only a very small part of their bulk is alive at once. The tree survives, but nothing now living has been so long. In it, as elsewhere, life is a transi- tory thing, ever abandoning the old, and renewed in the young. § 4. ANATOMY OF LEAVES. 439. The wood in leaves is the framework of ribs, veins, and veinlets (125), serving not only to strengthen them, but also to bring in the sap, and to distribute it throughout every part. The cellular portion is the SECTION 1G.] ANATiiMV OF LK.W IS. 143 greeu pulp, ami i> nearly the Bame aa the green layer of the bark. 80 that the Leaf maj properly enough be regarded as a Borl of expansion of the fibrous and green layers of the bark. It has no proper corky layer; but the whole is covered by a transparent skin or epidermis, resembling that of t ho stem. 1 tO. The cells of the leaf are of various forms, rarely so compact as to form a elo.se eellular tissue, usualU loosely arranged, at least in the lower part, so as to give copious intervening spaces or air passages, communi- cating throughout the whole interior (Fig. 443, 4S3). The green color is given by the chlorophyll (417), seen through the very transparent walls of the cells and through the translucent epidermis of the leaf. 441. In ordinary leaves, having an upper and under surface, the green cells form two distinct strata, of different arrangement. Those of t he upper stratum arc oblong or cylindrical, and stand endwise to the surface of the leaf, usually close together, leaving hardly any vacant spaces; those of the lower are commonly irregular in shape, most of them with their longer diameter parallel to the face of the leaf, and are very loosely ar- ranged, leaving many and wide air-chambers. The green color of the lower is therefore diluted, and paler than that of the upper face of the leaf. The upper part of the leaf is so constructed as to bear the direct action of the sunshine ; the lower so as to afford freer circulation of air, and to facilitate transpiration. It communicates more directly than the upper with the external air by means of StomaUt. 442. The Epidermis or skin of leaves and all young shoots is best seen in the foliage. It may readily lie .stripped off from the surface of a Lily-leaf, and still more so fn lore fleshy and soft leaves, such as those Pio. 188. Magnified section of a leaf <>f White Lily, to exhibit the cellular Btructare, both of apper and Lower stratum, the air-paaaagea of the lower, and the epidermis or skin, in section, ulso a little of that of the lower face, with some of its stomutes. 144 VEGETABLE LIFE AND WORK. [SECTION 16. of Houseleek. The epidermis is usually composed of a siugle layer, occa- sionally of two or three layers, of empty s p~ — -p- — --n cells, mostly of irregular outline. The sin- / uous lines which traverse it, and may be dis- 7 cerned under low powers of the microscope (Fig. 487), are the boundaries of the epidermal cells. 443. Breathing-pores, or Stomates, Stomata (singular, a Stoma, — literally, a mouth) are openings through the epidermis into the air-chambers or intercellular passages, always between and guarded by a pair of thin- walled guardian cells. Although most abundant in leaves, especially on their lower face (that which is screened from direct sunlight), they are found on most other green parts. They establish a direct communication between the external air and that in the loose interior of the leaf. Their guardian cells or lips, which are soft and delicate, like those of the green pulp within, by their greater or less turgidity open or close the orifice as the moisture or dryness varies. 444. In the White Lily the stomata are so remarkably large that they may be seen by a simple microscope of moderate power, and may be dis- cerned even by a good hand lens. There are about 60,000 of them to the square inch of the epidermis of the lower face of this Lily-leaf, and only about 3000 to the same space on the upper face. It is computed that an average leaf of an Apple-tree has on its lower face about 100,000 of these mouths. §5. PLANT FOOD AND ASSIMILATION. 445. Only plants are capable of originating organizable matter, or the materials which compose the structure of vegetables and animals. The es- sential and peculiar work of plants is to take up portions of earth and air (water belonging to both) upon which animals cannot live at all, and to convert them into something organizable ; that is, into something that, under life, may be built up into vegetable and animal structures. All the food of animals is produced by plants. Animals live upon vegetables, Fig. 484. Small portion of epidermis of the lower face of a White-Lily leaf, with stomata. Fig. 485. One of these, more magnified, in the closed state. 486. Another stoma, open. Fig. 487. Small portion of epidermis of the Garden Balsam, highly magnified, showing very sinuous-walled cells, and three stomata. SECTION 1C] PLANT FOOD AND ASSIMILATION. 145 directly or at second hand, the carnivorous upon the herbivorous; and vegetables live upon earth and air, immediately or at second hand. 446. The Food of plants, then, primarily, is earth and air. This ia evident enough from the way in which they live. Many plants will flourish in pure sand or powdered chalk, or on the bare face of a rock or wall, watered merely with rain. And almost any plant may he made to grow from the seed in moist sand, and increase its weight many times, even if it will not come to perfection. Many naturally live suspended from the branches of trees high in the air, and nourished by it alone, never hav- ing any connection with the soil; and some which naturally grow on the ground, like the Live-forever of the gardens, when pulled up by the roots and hung in the air will often nourish the whole summer long. 447. It is true that fast -growing plants, or those which produce much vegetable matter in one season (especially in such concentrated form as to be useful as food for man or the higher animals) will come to maturity mly in an enriched soil. But what is a rich soil ? One which contains decomposing vegetable matter, or some decomposing animal matter; that is, in either case, some decomposing organic matter formerly produced by plants. Aided by this, grain-bearing and other important vegetables will grow more rapidly and vigorously, and make a greater amount of nourish- ing matter, than they could if left to do the whole work at once from the beginning. So that in these cases also all the organic or organizable matter was made by plants, and made out of earth and air. Ear the larger and most essential part was air and water. 448. Two kinds of material are taken in and used by plants; of which the first, although more or less essential to perfect plant-growth, are in a certain sense subsidiary, if not accidental, viz. : — Earthy constituents, those which are left in the form of ashes when a leaf or a stick of wood is burned in the open air. These consist of some potash (<>r soda in a marine plant), some silex (the same as flint), and a little lime, alumine, or magnesia, iron or manganese, sulphur, phosphorus, etc., — some or all of these in variable and usually minute proportions. They are such materials as happen to be dissolved, in small quantity, in the water taken up by the roots; and when that is consumed by the plant, or flies off pure (as it largely does) by exhalation, the earthy matter is left behind in the cells, — just as it is left inerusting the sides of a teakettle in which much hard water has been boiled. Naturally, therefore, there is more earthy matter (i. e. more ashes) in the leaves than in any other part (sometimes as much as seven per cent, when the wood contains only two per cent); because it is through the leaves that most of the water escapes from the plant. Some of this earthy matter inerusts the cell-walls, some ur"cs to form crystals or rlmphides, which abound in many plants (429), BOme enters into certain special vegetable products, ami some appears to be ne- Cessary to the well-being of the higher orders of plants, although forming no necessary oart of the proper vegetable structure. 10 146 VEGETABLE LIFE AND WORK. [SECTION 16. The essential constituents of the organic fabric are those which are dissi- pated into air and vapor in complete burning. They make up from 88 to 99 per cent of the leaf or stem, and essentially the whole both of the cellu- lose of the walls and the protoplasm of the contents. Burning gives these materials of the plant's structure back to the air, mainly in the same condi- tion in which the plant took them, the same condition which is reached more slowly in natural decay. The chemical elements of the cell-walls (or cellulose, 402), as also of starch, sugar1, and all that class of organizable cell-material, are carbon, hydrogen, and oxygen (399). The same, with nitrogen, are the constituents of protoplasm, or the truly vital part of vegetation. 449. These chemical elements out of which organic matters are com- posed are supplied to the plant by water, carbonic acid, and some combina- tions of nitrogen. Water, far more largely than anything else, is imbibed by the roots ; also more or less by the foliage in the form of vapor. Water consists of oxygen and hydrogen; and cellulose or plant-wall, starch, sugar, etc., however different in their qualities, agree in containing these two elements in the same relative proportions as In water. Carbonic acid gas (Carbon dioxide) is one of the components of the atmos- phere, — a small one, ordinarily only about -2 £0 0 of its bulk, — sufficient for the supply of vegetation, but not enough to be injurious to animals, as it would be if accumulated. Every current or breeze of air brings to the leaves expanded in it a succession of fresh atoms of carbonic acid, which it absorbs through its multitudinous breathing-pores. This gas is also taken up by water. So it is brought to the ground by rain, and is absorbed by the roots of plants, either as dissolved in the water they imbibe, or in the form of gas in the interstices of the soil. Manured ground, that is, soil containing decomposing vegetable or animal matters, is constantly giving out this gas into the interstices of the soil, whence the roots of the growing crop absorb it. Carbonic acid thus supplied, primarily from the air, is the source of the carbon which forms much the largest part of the substance of every plant. The proportion of carbon may be roughly estimated by charring some wood or foliage ; that is, by heating it out of contact with the air, so as to decom- pose and drive off all the other constituents of the fabric, leaving the large bulk of charcoal or carbon behind. Nitrogen, the remaining plant-element, is a gas which makes up more than two thirds of the atmosphere, is brought into the foliage and also to the roots (being moderately soluble in water) in the same ways as is car- bonic acid. The nitrogen which, mixed with oxygen, a little carbonic acid, and vapor of water, constitutes the air we breathe, is the source of this fourth plant-element. But it is very doubtful if ordinary plants can use any nitrogen gas directly as food ; that is, if they can directly cause it to combine with the other elements so as to form protoplasm. But when com- bined with hydrogen (forming ammonia), or when combined with oxygen SECTION 10.] PLANT FOOD AND ASSIMILATION. 147 (nitric acid and nitrates) plants appropriate it with avidity. And several natural processes are going on in which nitrogen of the air is so combined and supplied to the soil in forms directly available to the plant. The most efficient is nitrification, the formation of nitre (nitrate of potash) in the soil, especially in all fertile soils, through the action of a bacterial ferment 450. Assimilation in plants is the conversion of these inorganic sub- stances— essentially, water, carbonic acid, and some form of combined or combinable nitrogen — into vegetable matter. This most dilute food the living plant concentrates and assimilates to itself. Only plants are capable of converting these mineral into organizable matters; and this all-important work is done by them (so far as all ordinary vegetation is concerned) only 451. Under the light of the sun, acting upon green parts or foliage, that is, upon the chlorophyll, or upon what answers to chlorophyll, which these parts contain. The sun in some way supplies a power which enables the living plant to originate these peculiar chemical combinations, — to organ- ize matter into forms which are alone capable of being endowed with life. The proof of this proposition is simple ; and it shows at the same time, in the simplest way, what a plant does with the water and carbonic acid it consumes. Namely, 1st, it is only in sunshine or bright daylight that the green parts of plants give out oxygen gas, — then they regularly do so; and 2d, the giving out of this oxygen gae is required to render the chemical composition of water and carbonic acid the same as that of cellulose, that is, of the plant's permanent fabric. This shows why plants spread out so large a surface of foliage. Leaves are so many workshops, full of mu- chinery worked by sun-power. The emission of oxygen gas from any sun-lit foliage is seen by placing some of this under water, or by using an aquatic plant, by collecting the air bubbles which rise, and by noting that a taper burns brighter in this air. Or a leafy plant in a glass globe may be supplied with a certain small percentage of carbonic acid gas, and after proper exposure to sunshine, the air on being tested will be found to con- tain less carbonic acid and just so much the more oxygen gas. 452. Now if the plant is making cellulose or any equivalent substance, — that is, is making the very materials of its fabric and growth, as must generally be the case, —all this oxygen gas given oil' by the leaves comes from the decomposition of carbonic acid taken in by the plant. For cellu- lose, and also starch, dextrine, sugar, and the like are composed of carbon along with oxygen and hydrogen in just the proportions to form water. And the carbonic acid ami water taken in, less the oxygen which the carbon brought with it as carbonic acid, and which is given oil' from the foliage in sunshine, just represents the manufactured article, cellulose. 453. It comes to the same if the first product of assimilation is BUgST, or dextrine which is a sort of soluble starch, or starch itself. And in the plant all these forms are readily changed into one another. In the tiny seedling, as last as this assimilated matter is formed it is used in growth, that is, in the formation of cell- walls. After a time some or much of 148 VEGETABLE LIFE AND WORK. [SECTION 16. the product may be accumulated iu store for future growth, as iu the root of the turnip, or the tuber of the potato, or the seed of com or pulse. This store is mainly iu the form of starch. When growth begins anew, this starch is turned into dextrine or into sugar, in liquid form, and used to nourish and build up the germinating embryo or the new shoot, where it is at length converted into cellulose and used to build up plant-structure. 454. But that which builds plant-fabric is not the cellular structure itself; the work is done by the living protoplasm which dwells within the walls. This also has to take and to assimilate its proper food, for its own maintenance and growth. Protoplasm assimilates, along with the other three elements, the nitrogen of the plant's food. This comes primarily from the vast stock in the atmosphere, but mainly through the earth, where it is accumulated through various processes in a fertile soil, — mainly, so far as concerns crops, from the decomposition of former vegetables and animals. This protoplasm, which is formed at the same time as the simpler cellulose, is essentially the same as the flesh of animals, and the source of it. It is the common basis of vegetable and of animal life. 455. So plant-assimilation produces all the food and fabric of animals. Starch, sugar, the oils (which are, as it were, these farinaceous matters more deoxidated), chlorophyll, and the like, and even cellulose itself, form the food of herbivorous animals and much of the food of man. When digested they enter into the blood, undergo various transformations, and are at length decomposed into carbonic acid and water, and exhaled from the lungs in respiration, — in other words, are given back to the air by the ani- mal as the very same materials which the plant took from the air as its food, — are given back to the air in the same form that they would have taken if the vegetable matter had been left to decay where it grew, or if it had been set on fire and burned ; and with the same result, too, as to the heat, — the heat in this case producing and maintaining the proper temperature of the animal. 456. The protoplasm and other products containing nitrogen (gluten, legumine, etc.), and which are most accumulated in grains and seeds (for the nourishment of their embryos when they germinate), compose the most nutritious vegetable food consumed by animals; they form their proper flesh and sinews, while the earthy constituents of the plant form the earthy matter of the bones, etc. At length decomposed, in the secretions and excretions, these nitrogenous constituents are through successive changes finally resolved into mineral matter, into carbonic acid, water, and ammonia or some nitrates, — into exactly or essentially the same materials which the plants took up and assimilated. Animals depend upon vegetables abso- lutely and directly for their subsistence ; also indirectly, because 457. Plants purify the air for animals. In the very process by which they create food they take from the air carbonic acid gas, injurious to animal res- piration, which is continually poured into it by the breathing of all animals, by all decay, by the burning of fuel and all other ordinary combustion; and SECTION 1C] MOVEMENTS. 149 they restore an equal hulk of life-sustaining oxygen needful for the respiration of annuals, — needful, also, in a Certain measure, for plants in any work t hey do. For in plants, as well as in animals, work is done at a certain cost. § 6. PLANT WORK AND MOVEMENT. 453. As the organic basis and truly Living material of plants is identical with that of animals, so is the life at botl essentially the same; but In animals something is added at every rise from the lowest to highest organ- isms. Action and work in living beings require movement. 459. Living things move; those not living are only moved. Plants move as truly as do animals. The latter, nourished as they are upon or- ganised food, which has been prepared for them by plants, and is found only here and there, must needs have the power of going after it, of collect- ing it, or at least of taking it in ; which requires them to make spontaneous movements. But ordinary plants, with their wide-spread surface, always in contact with the earth and air on which they feed, — the latter every- where the same, and the former very much so, — might be thought to have no need of movement. Ordinary plants, indeed, have no locomotion ; some float, but most are rooted to the spot where they grew. Yet probably all of them execute various movements which must be as truly self-caused as are those of the lower grades of animals, — movements which are over- looked only because too slow to be directly observed. Nevertheless, the motion of the hour-hand and of the minute-hand of a watch is not less real than that of the second-hand. 460. Locomotion. Moreover, many microscopic plants living in water are seen to move freely, if not briskly, under the microscope ; and so like- wise do more conspicuous aquatic plants in their embryo- like or seedling state. Even at maturity, species of Oscillaria (such as in Fig. 4S8, minute worm-shaped plants of fresh waters, taking this name from their oscillating motions) freely execute three different kinds of movement, the very delicate investing coat of cellulose not impeding the action of the living protoplasm within. Even when this coat is firmer and hardened with a siliceous deposit, such crescent-shaped or boat-shaped one-celled plants as Cfoiteriun OT Naviemia are able in some way to mOVC along from place to place in the water. 461. Movements in Cells, or Cell-circulation, sometimes called (]i/- closis, has been detected iu so many plants, especially in comparatively Fiu. 4fi8. Two individuals ut au Oscillaria, magnified. 150 VEGETABLE LIFE AND WORK. [SECTION 16. x/JfR transparent aquatic plants and in hairs on the surface of land plants (where it is easiest to observe), that it may be inferred to take place in all cells during the most active part of their life. This motion is commonly a streaming movement of threads of protoplasm, carrying along solid granules by which the action may be ob- served and the rate measured, or in some cases it is a rotation of the whole protoplasmic contents of the cell. A comparatively low magnifying power will show it in the cells of Nitella and Chara (which are cryptogamous plants) ; and under a moderate power it is well seen in the Tape Grass of fresh water, Vallisueria, and in Naias flexilis (Fig. 489). Minute particles and larger green- ish globules are seen to be carried along, as if in a cur- rent, around the cell, passing up one side, across the end, down the other and across the bottom, completing the circuit sometimes within a minute or less when well warmed. To see it well in the cell, which like a string of beads form the hairs on the stamens of Spiderwort, a high magnifying power is needed. 462. Transference of Liquid from Cell to Cell, and so from place to place in the plant, the absorption of water by the rootlets, and the exhalation of the greater part of it from the foliage, — these and similar operations are governed by the physical laws which regulate the diffusion of fluids, but are controlled by the action of living protoplasm. Equally under vital control are the various chemical transformations which attend assimilation and growth, and which involve not only molecular movements but conveyance. Growth itself, which is the formation and shaping of new parts, implies the direction of internal activities to definite ends. 463. Movements of Organs. The living protoplasm, in all but the lowest grade of plants, is enclosed and to common appearance isolated in separate cells, the walls of which can only in their earliest state be said to be alive. Still plants are able to cause the protoplasm of adjacent cells to act in concert, and by their combined action to effect movements in roots, stems, or leaves, some of them very slow and gradual, some manifest and striking. Such movements are brought about through individually minute changes in the form or tension in the protoplasm of the innumera- ble cells which make up the structure of the organ. Some of the slower movements are effected during growth, and may be explained by inequality of growth on the two sides of the bending organ. But the more rapid changes of position, and some of the slow ones, cannot be so explained. Fig. 489. A few cells of a leaf of Naias flexilis, highly magnified: the arrows indicate the courses of the circulating currents. SECTION 10.] MOVEMENTS. 151 464. Root-movements. In its growth a root turns or bends away from the light and toward the centre of the earth, so that in lengthening it buries itself in the soil where it is to live and act. Every one must have observed this in the germination of seeds. Careful observations have .shown that the tip of a growing root also makes little sweeps or short movements from side to side. Bj this means it more readily insinuates itself into yielding portions of the soil. The root-tips will also turn toward moisture, and so secure the most favorable positions in the soil. 465. Stem-movements. The root end of the caulicle or first joint of stem (that below the cotyledons) acts like the root, in turning downward in germination (making a complete bend to do so if it happens to point upward as the seed lies in the ground), while the other end turns or points skyward. These opposite positions are taken in complete dark- ness as readily as in the light, in dryness as much as in moisture: there fore, so far as these movements are physical, the two portions of the same internode appear to be oppositely affected by gravitation or other in- fluences. 466. Rising into the air, the stem and green shoots generally, while young and pliable, bend or direct themselves toward the light, or toward the stronger light when unequally illuminated; while roots turn toward the darkness. 467. Many growing stems have also a movement of Nutation, that is, of nodding successively in different directions. This is brought about by a temporary increase of turgidity of the cells along one side, thus bowing the stem over to the opposite side; and this line of turgescence travels round the shoot continually, from right to left or from left to right accord- ing to the species ■. thus t he shoot bends to all points of the compass in succession. Commonly this nutation is slight or hardly observable. It is most marked in 468. Twining Stems (Fig. 90). The growing upper end of such stems, as is familiar in the Hop, Pole Beans, and Morning-Glory, turns over in an inclined or horizontal direction, thus stretching out to reach a neighboring support, and by the continual change in the direction of the nodding, sweeps the whole circle, the sweeps being the longer as the stem lengthens. When it strikes against a support, such as a stem or branch of a neighboring plant, the motion is arrested at the contact, but continues at the growing apex beyond, and this apex is thus made to wind spirally around the supporting body. 169. Leal-movements are all but universal. The presentation by most leaves of their upper surface to the light, from whatever direction that may come, is an instance; for when turned upside down they twist or bend round on the stalk to recover tins normal position. Leaves, and the leaflets of compound haves, change this position at nightfall, or when the light is withdrawn; thej then take what is called their sleeping posture, resuming the diurnal position when daylight returns. This is very striking 152 VEGETABLE LIFE AND WORK. [SECTION 16. in Locust-trees, in the Sensitive Plant (Fig. 490), and in Woodsorrel Young seedlings droop or close their leaves at night in plants which are not thus affected in the adult foliage. All this is thought to be a protec- tion against the cold by nocturnal radiation. 470. Various plants climb by a coiling movement of their leaves or their leaf-stalks. Familiar examples are seen in Clematis, Maurandia, Tropseo- lum, and in a Solanum which is much cultivated in greenhouses (Fig. 172). In the latter, and in other woody plants which climb in this way, the petioles thicken and harden after they have grasped their support, thus securing a very firm hold. 471- Tendril movements. Tendrils are either leaves or stems (98, 16S), specially developed for climbing purposes. Cobaea is a good exam- ple of partial transformation ; some of the leaflets are normal, some of the same leaf are little tendrils, and some intermediate in character. The Passion-flowers give good examples of simple stem-tendrils (Fig. 92) ; Grape-Vines, of branched ones. Most tendrils make revolving sweeps, like those of twining stems. Those of some Passion-flowers, in sultry weather, are apt to move fast enough for the movement actually to be seen for a part of the circuit, as plainly as that of the second-hand of a watch. Two herbaceous species, Passiflora gracilis and P. sicyoides (the first an annual, the second a strong-rooted perennial of the easiest cultivation), are admirable for illustration both of revolving movements and of sensitive coiling. 472. Movements under Irritation. The most familiar case is that of the Sensitive Plant (Fig. 490). The leaves suddenly take their nocturnal position when roughly touched or when shocked by a jar. The leaflets close in pairs, the four outspread par- tial petioles come closer together, and the common petiole is depressed. The seat of the move- ments is at the base of the leaf-stalk and jtalk- lets. Schrankia, a near relative of the Sensitive Plant, acts in the same way, but is slower. These are not anoma- lous actions, but only extreme manifestations of a faculty more or less common in foliage. In Locust and Honey-Locusts for example, repeated jars will slowly pro- duce similar effects. 490 Fig. 490. Piece of stem of Sensitive Plant (Mimosa pudica), with two leaves, the lower open, the upper in the closed state. SECTION 16.] MOVEMENTS. 153 473. Leaf-stalks and tendrils are adapted to their uses in climbing by a similar sensitiveness. The coiling of the leaf-stalk is in response to a kind of irritation produced by contact with the supporting body. This maybe shown by gentle rubbing or prolonged pressure upon the upper face of the leaf-stalk, which is soon followed 1>\ a curvature. Ten- drils are still more sensitive to contact or light friction. Thi> causes tin- free end of the tendril to coil round the support, and the sensitiveness, propagated downward along the tendril, causes that, side of it to become less turgescent or the opposite side more so, thus throwing the tendril into coils. This shortening draws the plant up to the support. Tendrils which have not laid hold will at length commonly coil spontaneously, in a simple coil, from the free apex downward. In Sicyos, Echiuocystis, and the above mentioned Passion-no wers - (471), the tendril is so sensitive, 'j I under a high summer temperature, that it will curve and coil prompt- ly after one or two light strokes by the hand. 474. Among spontaneous move- ments the most singular are those of Desmodium gyrans of India, sometimes called Telegraph-plant, which is cultivated on account of this action. Of its three leaflets, the larger (terminal) one moves only by drooping at nightfall and rising with the dawn. But its two small lateral leaflets, when in a congenial high temperature, by day and by night move upward and downward in a succession of jerks, stopping occasionally, as if to re- cover from exhaustion. In most plant-movements some obviously useful purpose is subserved •. this of Desmodinm gyrans is a riddle. 475. Movements in Flowers are very various The most remarkable are in some way connected with fertilization (Sect. Mil). Some occur under irritation: the stamens of Barberry start forward when touched at the base inside: those of many polyaadrous flowers (of Sparmannis very strikingly) spread out wardly when lightly brushed : the two lips or lobes Pio. 191. Portion <>t" stem and loaves of Telegraph-plant (Desmodinm gyrus), almost of natural size. 154 VEGETABLE LIFE AND WORK. [SECTION 16. of the stigma in Mimulus close after a touch. Some are automatic and are connected with dichogamy (339) : the style of Sabbatia and of large- flowered species of Epilobium bends over strongly to one side or turns down- ward when the blossom opens, but slowly erects itself a day or two later. 476. Extraordinary Movements connected with Capture of In- sects. The most striking cases are those of Drosera and Dionsea; for an account of which see "How Plants Behave," and Goodale's " Physiological Botany." 477. The upper face of the leaves of the common species of Drosera, or Sundew, is beset with stout bristles, having a glandular tip. This tip secretes a drop of a clear but very viscid liquid, which glistens like a dew- drop in the sun ; whence the popular name. When a fly or other small insect, attracted by the liquid, alights upon the leaf, the viscid drops are so tenacious that they hold it fast. In struggling it only becomes more com- pletely entangled. Now the neighboring bris- tles, which have not been touched, slowly bend inward from all sides toward the captured in- sect, and bring their sticky apex against its body, thus increasing the number of bonds. Moreover, the blade of the leaf commonly aids in the capture by becoming concave, its sides or edges turning inward, which brings still more of the gland-tipped bristles into contact with the captive's body. The insect per- ishes ; the clear liquid disappears, apparently by absorption into the tissue of the leaf. It is thought that the absorbed secretion takes with it some of the juices of the insect or the products of its decompo- sition. 478. Dionsea muscipula, the most remarkable vegetable fly-trap (Fig. 176, 492), is related to the Sundews, and has a more special and active apparatus for fly- catching, formed of the summit of the leaf. The two halves of this rounded body move as if they were hinged upon the midrib; their edges are fringed with spiny but not glandular bristles, which interlock when the organ closes. Upon the face are two or three short and delicate bristles, which are sensitive. They do not themselves move when touched, but they propagate the sensitiveness to the organ itself, causing it to close with a quick movement. In a fresh Fig. 492. Plant of Dionaea muscipula, or Venus's Fly-trap, reduced iu size. SECTION 10.] TRANSFORMING MATERIAL AND ENERGY. 155 and vigorous leaf, under a high Bummer temperature, and when the trap lies widely open, a touch of any one of the minute bristles on the face, bj the finger or any extraneous body, springs the trap (so to say), and it closes suddenly; but after an hour or bo it opens again. When a fly or Other small insect alights on the trap, it closes in the same manner, and so quickly thai the intercrossing marginal bristles obstruct the egress of the insect, unless it be a small one and not worth taking. Afterwards and more slowly it completely closes, and presses down upon the prey; then some hidden glands pour oul a glairy liquid, which dissolves out the juices of the insect's body; next all is re-absorbed into the plant, and the trap opens to repeat the operation. But the same leaf perhaps never captures more than two or three insects. It ages instead, becomes more rigid and motionless, or decays away. 479. That some few plants should thus take animal food will appear less surprising when it is considered that hosts of plants of the lower grade, known as Fungi, moulds, rusts, ferments, Bacteria, etc., live upon animal or other organized matter, either decaying or living. That plants should execute movements in order to accomplish the ends of their existence is less surprising now when it is known that the living substance of plants and animals is essentially the same; that the beings of both kingdoms par- take of a common life, to which, as they rise in the scale, other and higher endowments are successively superadded. 4S0. Work uses up material and energy in plants as well as in ani- mals. The latter live and work by the consumption and decomposition of that which plants have assimilated into organizable matter through an energy derived from the sun, and which is, so to say, stored up in the as- similated products. In every internal action, as well as in every movement and exertion, some portion of this assimilated matter is transformed and of its stored energy expeuded. The steam-engine is an organism for con- verting the sun's radiant energy, stored up by plants in the fuel, into me- chanical work. An animal is an engine fed by vegetable fuel in the same or other forms, from the same source, by the decomposition of which it also does mechanical work. The plant is the producer of food and accumu- lator of solar energy or force. Hut the plant, like the animal, is a con- sumer whenever ami by so much as it docs any work except its greal work of assimilation. Every internal change and movement, every transforma- tion, such as that of starch into sugar and of sugar into cell-walls, as well as every movement of parts which becomes externally visible, is done at the expense of a certain amount of its assimilated matter and of its stored energy ; that is. by the decomposition or combustion of sugar or some such product into carbonic acid and water, which is given back to the air, just as in the animal it is given back to the air in respiration. So the respira- tion of plants is as real and as essential as that of animals. Hut what plants consume or decompose in their life and actiou is of iusiguilieant amount in comparison with what they com] 15G CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17 Section XVTI. CRYPTOGAMOUS OR FLOWERLESS PLANTS. 481. Even the beginner in botany should have some general idea of what cryptogamous plants are, and what are the obvious distinctions of the principal families. Although the lower grades are difficult, and need special books and good microscopes for their study, the higher orders, such as Ferns, may be determined almost as readily as phanerogamous plants. 482. Linnaeus gave to this lower grade of plants the name of Crypto- gamia, thereby indicating that their organs answering to stamens and pistils, if they had any, were recondite and unknown. There is no valid reason why this long-familiar name should not be kept up, along with the counterpart one of Phanerogamic/, (6), although organs analogous to stamens and pistil, or rather to pollen and ovule, have been discovered in all the higher and most of the lower grades of this series of plants. So also the English synonymous name of Floicerless Plants is both good and con- venient : for they have not flowers in the proper sense. The essentials of flowers are stamens and pistils, giving rise to seeds, and the essential of a seed is an embryo (8). Cryptogamous or Flowerless plants are propagated by Spores ; and a spore is not an embryo-plantlet, but mostly a single plant-cell (399). 483. Vascular Cryptogams, which compose the higher orders of this series of plants, have steins and (usually) leaves, constructed upon the general plan of ordinary plants ; that is, they have wood (wood-cells and vessels, 408) in the stem and leaves, in the latter as a frame work of veins. But the lower grades, having only the more elementary cellular structure, are called Cellular Cryptogams. Far the larger number of the former are Ferns : wherefore that class has been called 484. Pteridophyta, Pteridophytes in English form, meaning Fern- plants, — that is, Ferns and their relatives. They are mainly Horsetails, Ferns, Club-Mosses, and various aquatics which have been called Hydrop- terides, i. e. Water-Ferns. 485. Horsetails, Equisetaceae, is the name of a family which consists only (among now-living plants) of Equisetum, the botanical name of Horse- tail and Scouring Rush. They have hollow stems, with partitions at the nodes ; the leaves consist only of a whorl of scales at each node, these coalescent into a sheath : from the axils of these leaf-scales, in many species, branches grow out, which are similar to the stem but on a much smaller scale, close-jointed, and with the tips of the leaves more apparent. At the apex of the stem appears the fructification, as it is called for lack of a better term, in the form of a short spike or head. This consists of a good num- ber of stalked shields, bearing on their inner or under face several wedge- shaped spore-cases. The spore-cases when they ripen open down the inner SECTION 17.] PTERIPOPHYTES. 157 side and discharge a great number of green spores of a size Urge enough to be well seen by a hand-glass. The spores arc aided in their discharge 494 v.. and dissemination by four club-shaped threads attached to one part of them. These are hygrometric : when moist they arc rolled up over the spore ; when dry they straighten, and exhibit lively movements, closing over the spore when breathed upon, and unrolling promptly a moment after as they dry. (See Fig. 493-493.) 4S6. Ferns, or Filices, a most attractive family of plants, are very numerous and varied, in warm and equable climates some rise into forest-trees, with habit of Palms; but most of them are peren- nial herbs. The wood of a Fern-trunk is very dif- ferent, however, from that of a palm, or of any exogenous stem either. A section is represented in Fiur. 500. The curved plates of wood each ter- 500 Fig. 498. Upper part of a stem of a Horsetail, Eqnisetum aylvaticum. t'.'t. Part of the head <>r Bpike of spore-cases, with s.mu- of the latter taken off. !!'.'•. View (more enlarged) of under Bide of the Bhield-shaped body, bearing a circle of spore- cases. 496. One <>f tin- latter detached and more magnified. l!'7. A --pore with the attached arms moistened. 198. Same when dry, the anus extended. Fio. i1.''.'. A Tree-Fern, Dicksonia arboresoens, with a yonng one near it- base. In front a common herbaceous Pern (Polypodium vulgare) with its creeping stem or root stock. Fl(». 500. A section oi the trunk ut a Tree-Fern. 158 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. miliate upward in a leaf-stalk. The subterranean trunk or stem of any strong-growing herbaceous Fern shows a similar structure. Most Ferns are circinate in the bud ; that is, are rolled up in the manner shown in Fig. 197. Uncoiling as they grow, they have some likeness to a crosier. 487. The fructification of Ferns is borne on the back or under side of the leaves. The early botanists thought this such a peculiarity that they 502 505 508 always called a Fern-leaf a Frond, and its petiole a Stipe. Usage con- tinues these terms, although they are superfluous. The fruit of Ferns consists of Spore-cases, technically Sporangia, which grow out of the veins of the leaf. Sometimes these are distributed over the whole lower Fig. 501. The Walking- Fern, Camptosorus, reduced in size, showing its fruit- dots on the veins approximated in pairs. 502. A small piece (pinnule) of a Shield-Fern: a row of fruit-dots on each side of the midrib, each covered by its kidney-shaped indusium. 503. A spore-case from the latter, just bursting by the partial straightening of the incomplete ring; well magnified. 504. Three of the spores of 509, more magnified. 505. Schizsea pusilla, a very small and simple- leaved Fern, drawn nearly of natui'al size. 506. One of the lobes of its fruit- bearing portion, magnified, bearing two rows of spore-cases. 507. Spore-case of the latter, detached, opening lengthwise. 508. Adder-tongue, Ophioglossum : spore-cases in a kind of spike: a, a portion of the fruiting part, about natural size ; showing two rows of the firm spore-cases, which open transversely into two valves. SECTION 17.] PTERIDOPHYTES. 159 surface of the leaf or frond, or over the whole surface when there arc no proper Leaf-blades to the frond, but all is reduced to .stalks. Commonly the spore-cases occupy only detached Bpota or lines, each of which is called a Sorus, or in English merely a Fruit-dot In many Ferns these fruit-dots are naked ; in others they an- produced under a scale-like hit of membrane, called an Endusium. In Maidenhair-Ferns a little lobe of the leaf is folded back over each fruit-dot, to serve as its shield or indusiuni. In the true Brake or Bracken (Pteris) the whole edge of the fruit-bearing part of the leaf is folded back over it like a hem. 488. The form and structure of the spore-cases can be made out with a common hand magnifying glass. The commonest kind (shown in Fig. 503) lias a stalk formed of a row of jointed cells, and is itself composed of a layer of thin-walled cells, but is incompletely surrounded by a border of thicker-walled cells, forming the Ring. This extends from the stalk up one side of the spore-case, round its summit, descends on the other side, but there gradually vanishes. In ripening and drying the shrinking of the cells of the ring on the outer side causes it to straighten; in doing so it tears the spore-case open ou the weaker side and discharges the minute spores that fill it, com- monly with a jerk which scatters them to the wind. Another kind of spore-case (Fig. 507) is stalkless, and has its ring-cells forming a kind of cap at the top : at ma- turity it splits from top to bottom by a regular dehiscence. A third kind is of firm texture and opens across into two valves, like a clam-shell (Fig. 508") : this kind makes an approach to the next family. 489. The spores germi- nate on moistened ground. In a conservatory they may be found germinating on a damp wall or on the edges of a well-watered tlower-pot. Instead of directly forming a fern-plantlet, the spore grows firs! into a body which Fio. 509. A young prothallua of a Maiden-hair, moderately enlarged, ami an older one with the first fern-leaf developed from near the notch. 510t Middle por- tion of the young one, nuicli magnified, showing below, partly among tin- rootlets, the antheridia or fertilizing organs, and above, near the notch, three pistillidia to be fertilized. 160 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. closely resembles a small Liverwort. This is named a Prothallus (Fig. 509) : from some point of this a bud appears to originate, which produces the first fern-leaf, soon followed by a second and third, and so the stem and leaves of the plant are set up. 490. Investigation of this prothallus under the microscope resulted in the discovery of a wholly unsuspected kind of fertilization, taking place at this germinating stage of the plant. On the under side of the prothallus two kinds of organs appear (Fig. 510). One may be likened to an open and depressed ovule, with a single cell at bottom answering to nucleus ; the other, to an anther; but instead of pollen, it discharges corkscrew- shaped microscopic filaments, which bear some cilia of extreme tenuity, by the rapid vibration of which the filaments move freely over a wet surface. These filaments travel over the surface of the prothallus, and even to other prothalli (for there are natural hybrid Ferns), reach and enter the ovule- Fig. 511. Lycopodium Carolinianum, of nearly natural size. 512. Inside view of one of the bracts and spore-case, magnified. Fig. 513. Open 4-valved spore-case of a Selaginella, and its four large spores (macrospores', magnified. 514. Macrospores of another Selaginella. 515. Same separated. Fig. 516. Plant of Isoetes. 517. Base of a leaf and contained sporocarp filled with microspores cut across, magnified. 518. Same divided lengthwise, equally magnified ; some microspores seen at the left. 519. Section of a spore-case contain- ing macrospores, equally magnified ; at the right three macrospores more magnified. SECTION 17.] PTERIDOPnYTES. 161 like cavities, and fertilise the cell. This thereupon sets up a growth, forms a vegetable hud, and BO develops the new plant. 491. An essentially similar process of fertilization has been discovered in the preceding and the following families of Pteridophytes ; but it is mostly subterranean and very difficult to observe. 492. Club-Mosses or Lycopodiums. Some of the common kinds, called Ground Pine, arc familiar, being largely used for Christmas wreaths and other decoration. They are low evergreens, some creeping, all with considerable wood in their stems: this thickly beset with small leaves. In the axils of some of these leaves, or more commonly, in the axils of pecu- liar leaves changed into bracts (as in Fig. 511, 512; spore-cases appear, as roundish or kidney-shaped bodies, of firm texture, opening round the top into two valves, and discharging a great quantity of a very tine yellow powder, the spores. 493. The Selaginellas have been separated from Lycopodium, which they much resemble, because they produce two kinds of spores, in sepa- rate spore-cases. One kind (Microspores) is just that of Lycopodium; the other cousists of only four large spores (Macro- spores), in a spore-case which usually breaks in pieces at maturity (Fig. 513-515). 494. The Quill worts, Isoetes (Fig. 516-519), are very unlike Club Mos- ses in aspect, but have been associated with them. They look more like Rushes, and live in water, or partly out of it. A very short stem, like a conn, bears a cluster of roots underneath ; above it is covered by the broad bases of a cluster of awl- shaped or thread-shaped leaves. The spore-eases are immersed in the bases of the leaves. The outer leaf-bases contain numerous macrospore merable microspores, 495. The Pillworts {Marnlia and Ptiularia) an the inner are filled with iiinu- low aquatics, which Fio. 520. Plant of Manilla quadrifoliata, reduced in Rise; at the right ■ pair of ■poro-carps of about uatural size. 11 162 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. bear globular or pill-shaped fruit (Sporocarps) on the lower part of their leaf-stalks or on their sleuder creeping stems. The leaves of the commoner species of Marsilia might be taken for four-leaved Clover. (See Fig. 520.) The sporocarps are usually raised on a short stalk. Within they are divided lengthwise by a partition, aud then crosswise by several partitions. These partitions bear numerous delicate sacs or spore-cases of two kinds, intermixed. The larger ones contain each a large spore, or macrospore ; the smaller contain numerous microspores, immersed in mucilage. At maturity the fruit bursts or splits open at top, and the two kinds of spores are discharged. The large ones in germination produce a small prothallus ; upon which the contents of the microspores act in the same way as in Ferns, and with a similar result. 496. Azolla is a little floating plant, looking like a small Liverwort or Moss. Its branches are covered with minute and scale-shaped leaves. On the under side of the branches are found egg-shaped thin-walled sporo- carps of two kinds. The small ones open across and discharge micro- spores ; the larger burst irregularly, and bring to view globose spore-cases, attached to the bottom of the sporocarp by a slender stalk. These delicate spore-cases burst aud set free about four macrospores, which are ferti- lized at germination, in the manner of the Pillworts and Quillworts. (See Fig. 521-526 ) 522 524 525 526 497. Cellular Cryptogams (483) are so called because composed, even in their higher forms, of cellular tissue only, without proper wood- cells or vessels. Many of the lower kinds are mere plates, or ribbons, or simple rows of cells, or even single cells. But their highest orders follow the plan of Ferns and phanerogamous plants in having stem and leaves for their upward growth, and commonly roots, or at least rootlets, Fiq. 521. Small plant of Azolla Caroliniana. 522. Portion magnified, showing the two kinds of sporocarp; the small ones contain microspores ; 523 represents one more magnified. 524. The larger sporocarp more magnified. 525. Same more magnified and burst open, showing stalked spore-cases. 526. Two of the latter highly magnified ; one of them bursting shows four contained macrospores; between the two, three of these spores highly magnified. SECTION 17.] BRYOPHYTES. 163 form, Bryum being the principal kiml> . true plural- , and Hepatic to attach them to the soil, or to trunks, or to other bodies on which they grow. Plants of this grade arc chiefly Mosses. So as a whole they take the name of 498. Bryophyta, Bryophytes in Englis Greek name of a Moss. These plants are of two Mosses (M/tsci, which is their Latin name in the Mosses, or Liverworts (Hepatica). 499. Mosses or Musci. The pale Peat-mosses (species of Sphagnum the principal component of sphagnous bogs) and the strong growing Hair cap Moss (Polytrichum) are among the lar- ger and commoner representatives of this numerous family ; while Fountain Moss (Fon- tinalis) in running water sometimes attains the length of a yard or more. On the other hand, some are barely individually distinguishable to the naked eye. Fig. 527 represents a com- mon little Moss, enlarged to about twelve times its natural size ; and by its side is part of a leaf, much magnified, showing that it is composed of cellular tissue (parenchyma-cells) only. The leaves of Mosses are always sim- ple, distinct, and sessile on the stem. The fructification is an urn-shaped spore-case, in this as in most cases raised on a slender stalk. The spore-case loosely bears on its summit n thin and pointed cap, like a candle-extin- guisher, called a Cah/ptra. Detaching this, it is found that the spore-case is like a pyxis (370), that is, the top at maturity comes off as a lid {Operculum) ; and that the interior is filled with a green powder, the spores, which are discharged through the open mouth. In most Mosses there is a fringe of one or two •! (/s/l.nV^/s rows of teeth or membrane around this mouth 628 52' or orifice, the Peristome. When moist the peristome closes hygrometri- cally over the orifice more or less; when drier the teeth or processes commonly bend outward or recurve; and then the spores more readily es- cape. Tn Hair-rap Moss a membrane is stretched quite across the month, like a drum-head, retaining the spores until this wears away. See Figures 527-541 for details. 500. Fertilization in Mosses is by the analogues of stamens and pistils, which are hidden in the axils of leaves, or in the cluster of leaves at the Fro. 527. Single plant of Physcomitrium pyriforme, magnified. 02*. Top of * leaf, cut across; it consists of a single layer ol cells. 164 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. end of the stem. The analogue of the anther (Antheridium) is a cellular sac, which in bursting discharges innumerable delicate cells floating in a mucilaginous liquid; each of these bursts and sets free a vibratile self- 531 534 541 540 moving thread. These threads, one or more, reach the orifice of the pistil- shaped body, the Pistillidium, and act upon a particular cell at its base within. This cell in its growth develops into the spore-case and its stalk (when there is any), carrying on its summit the wall of the pistillidium, which becomes the calyptra. 501. Liverworts or Hepatic Mosses {Hepatica) in some kinds re- semble true Mosses, having distinct stem and leaves, although their leaves occasionally run together ; while in others there is no distinction of stem and leaf, but the whole plant is a leaf-like body, which produces rootlets on the lower face and its fructification on the upper. Those of the moss-like kind (sometimes called Scale-Mosses) have their tender spore-cases splitting into four valves ; and with their spores are intermixed some slender spiral Fig. 529. Mnium cuspidatum, smaller than nature. 530. Its calyptra, detached, enlarged. 531. Its spore-case, with top of stalk, magnified, the lid (532) being detached, the outer peristome appears. 533. Part of a cellular ring (annulus) which was under the lid, outside of the peristome, more magnified. 534. Some of the outer and of the inner peristome (consisting of jointed teeth) much magni- fied. 535. Antheridia and a pistillidium (the so-called flower) at end of a stem of same plant, the leaves torn away (cf, antheridia, $. pistillidium), magnified. 536. A bursting antheridium, and some of the accompanying jointed threads, highly magnified. 537. Summit of an open spore-case of a Moss, which has a peristome of 16 pairs of teeth. 538. The double peristome of a Hypnum. 539-541. Spore-case, detached calyptra, and top of more enlarged spore-cast> and detached lid, of Physcomitrium pyriforme (Fig. 527) : orifice shows that there is no peristome. SECTION 17. J BRYOPHYTBS. 165 and very hygrometric threads (culled Elaters) which arc thought to aid in the dispersion of the spores. (Fig 5 I I 5 II) 502. Marchantia, the commonest and largest of the true Liverworts. forms large green plates or fronds on damp and shad} ground, and sends up from s«»me part of the upper face a si out stalk, ending in a several-lobed umbrella-shaped body, under the lobes of which hang several thin-walled spore-cases, which burst open and discharge spores and elaters. Riccia nutans (Fig. 545) consists of wedge-shaped or heart-shaped fronds, which float free in pools of still water. The under face bears copious rootlets ; in the substance of the upper face arc the spore-cases, their pointed tips 542 merely projecting: there they burst open, and discharge their spores. These are comparatively few and large, and are in fours; so they arc very like the macrospores of Pill worts or Quillworts. 503. Thallophyta, or Thallophytes in English form. This is the name for the lower class of Cellular Cryptogams, —plants in which there is no marked distinction into root, stem, and leaves. Roots in any proper sense they never have, as organs for absorbing, although some of the larger Seaweeds (such as the Sea Colander, Fig. 553) have them as holdfasts. Instead of axis and foliage, there is a stratum of frond, in such plants commonly called a Tiiallus (by a strained use of a Greek and Latin word which means a green shoot or bough), which may have any kind of form, leaf-like, stem-like, branchy, extended to a flat plate, or gathered into a sphere, or drawn out into threads, or reduced to a single row of cells, or even reduced to single cells. Indeed, Thallophytes are so multifarious, so numerous in kinds, so protean in their stages and transformations, so re- condite in their fructification, and many so microscopic in size, either of Fio. 642. Fructification of a Jungermannia, magnified; its cellular Bpore-ttalk, Burronnded at base by some of the leaves, at summit the L-valved spore-case open- in.', discharging spores and slaters. 648. Two elaters and some spores From the same, highly magnified. Fig. 544, One of the frondose Liverworts! Steetda, otherwise like a Junger uiaimia; the spore-case not yet protruded from its sheath. 166 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. the plant itself or its essential organs, that they have to be elaborately described in separate books and made subjects of special study. 504. Nevertheless, it may be well to try to give some general idea of what Algae and Lichens and Fungi are. Linnaeus had them all under the orders of Algae and Fungi. Afterwards the Lichens were separated ; but 545 546 547 of late it has been made most probable that a Lichen consists of an Alga and a Fungus conjoined. At least it must be so in some of the ambiguous forms. Botanists are in the way of bringing out new classifications of the Thallophytes, as they come to understand their structure and relations better. Here, it need only be said that 505. Lichens live in the air, that is, on the ground, or on rocks, trunks, walls, and the like, and grow when moistened by rains. They assimilate air, water, and some earthy matter, just as do ordinary plants. Algae, or Sea- 550 551 552 weeds, live in water, and live the same kind of life as do ordinary plants. Fungi, whatever medium they inhabit, live as animals do, upon organic mat- ter,— upon what other plants have assimilated, or upon the products of Fig. 545, 546. Two plants of Riccia natans, about natural size. 547. Magnified section of a part of the frond, showing two immersed spore-cases, and one emptied space. 548. Magnified section of a spore-case with some spores. 549. Magni- fied spore-case torn out, and spores; one figure of the spores united; the other of the four separated. Fig. 550. Branch of a Ohara, about natural size. 551. A fruiting portion, magnified, showing the structure; a sporocarp, and an antheridium. 552. Outlines of a portion of the stem in section, showing the central cell and the outer or cortical cells. SECTION 17.] THALLOPHYTES. 167 their decay. True as these general distinctions are, it is no less true that these orders run together in their lowest forma ; and that Alga and Fungi may be traced down into forms so low and Bimple that no clear In..' can be drawn between them ; and even into tonus of which it- is uncertain whether they should he called plants or animals. It is as well to say that they are not high enough in rank to he distinctively either the one or the other. On the other hand there is a peculiar group of plants, which in simplicity of OOmposition resemble the simpler AlgB3, while in fructification and in the arrangements of their simple cells into stem and branches I hey seem to be of a higher order, viz. : — 506. Characeae. These are aquatic herbs, of considerable size, abound- ing in ponds. The simpler kinds (Nitella) have the sicm formed of a single row of tubular cells, and at the nodes, or junction of the cells, a whorl of similar branches. Chara | Fig. 550-552) is the same, except that the cells which make up the stem and the principal branches are strength- ened by a coating of many smaller tubular cells, applied to the surface of the main or central cell. The fructifi- cation consists of a globular sporocarp of considerable size, which is spirally enwrapped by tubular cells twisted around it: by the side o\' this is a smaller and globular antheridium. The latter breaks upintoeiglri slneld- Fio, 553. Aganun Tnrneri, Sea Colander (so called from tin- perforations with which the frond, as it grows, becomes riddled); rery much reduced In Fkj. 664. Upper end <>r :t Rockweed, Fucus resiculosus, reduced half or more, b, the fructification, 168 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17, shaped pieces, with an internal stalk, and bearing long and ribbon-shaped filaments, which consist of a row of delicate cells, each of which dis- charges a free-moving microscopic thread (the analogue of the pollen or pollen-tube), nearly in the manner of Ferns and Mosses. One of these threads reaches and fertilizes a cell at the apex of the nucleus or solid body of the sporocarp. This subsequently germinates and forms a new individual. 507. Algae or Seaweeds. The proper Seaweeds may be studied by the aid of Professor Farlow's "Marine Algae of New England;" the fresh-water species, by Prof. H. C. Woods's "Fresh-water Algse of North America," a larger and less accessible volume. A few common forms are here very briefly mentioned and illustrated, to give an idea of the family. But they are of almost endless diversity. 508. The common Rockweed (Fucus vesiculosus, Fig. 554, abounding between high and low water mark on the coast), the rarer Sea Colander (Agarum Turneri, Fig. 553), and Laminaria, of which the larger forms are called Devil's Aprons, are good representatives of the olive green or brownish Seaweeds. They are attached either by a disk -like base or by root-like holdfasts to the rocks or stones on which they grow. 509. The hollow and inflated places in the Fucus vesiculosus or Rock- weed (Fig. 55i) are air-bladders for buoyancy. The fructification forms in the substance of the tips of the frond : the rough dots mark the places where the conceptacles open. The spores and the fertilizing cells are in different plants. Sections of the two kinds of conceptacles are given in Fig. 555 and 556. The contents of the conceptacles are discharged through Fig. 555. Magnified section through a fertile conceptacle of Rockweed, showing the large spores in the midst of threads of cells. 556. Similar section of a sterile conceptacle, containing slender antheridia. From Farlow's " Marine Alga; of New England." SECTION 17.] TIIAU.OPHYTES. 169 a small orifice which in each Bgure is at the margin of the page. The large spores are formed eight together in a mother-cell. The minute motile filaments of the antheridia fertilize the large spores after injection Into the water: and then the latter promptly acquire a cell-wall and germinate. 510. The Floridea or Hose-red scries of marine Algae (which, however, are sometimes green or brownish) are the most attractive to amateurs. The delicate Porphyra orLaver is in some countries eaten as a delicacy, and the cartilaginous Cuondrua crispus has been largely used for jelly. Besides their conceptacles, which contain true spores (Fig. 500), they mostly have a fructifi- cation in Tetraspores, that is, of spores originating in lours (Fig. 559). 500 511. The Grass-green Algae sometimes form broad membranous fronds, such as those of the common Ulva of the sea-shore, but most of them form ISA ■Mi mere threads, either simple or branched. To this division belong almost Fig. 567. Small plant <>f Chondrus crispus, or Carrageen Moss, reduced in si/c in fruit; the spots represent the fructification, consisting of numerous tetra- iporea in bunches in the substance <>f the plant. 558. Section through the thickness of one of the lobes, magnified, passing through two of tlio imbedded fruit-clusters, 559. Two of its tetraspores (spores in fours), highly magnified. Fig, 560. Section through a conceptacle of Delesaeria Leprieurei, much magni* Bed, showing the spores, which are single specialised cells, two or three in s row. fro. 561. a piece of the rose-red Delesseria Lepreiurei, double natural site. i">o-j. a piece cut out and much magnified, showing that it is composed of a layer »f cells. 568. a f.-w of the cells more highly magnified: the cells arc gelatinous mnl thick-walled. 170 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. all the Fresh- water Algae, such as those which constitute the silky threads or green slime of running streams or standing pools, and which were all called Confervas before their immense diversity was known. Some are formed of a single row of cells, developed each from the end of another. Others branch, the top of one cell producing more than one new one (Fig. 564). Others, of a kind which is very common in fresh water, simple threads made of a line of cells, have the chlorophyll and protoplasm of each cell ar- ranged in spiral lines or bands. They form spores in a peculiar way, which gives to this family the designation of conjugating Algae. 512. At a certain time two par- allel threads approach each other more closely ; contiguous parts of a cell of each thread bulge or grow out, and unite when they meet ; the cell-wall partitions between them are absorbed so as to open a free commu- nication; the spiral band of green matter in both cells breaks up ; the whole of that of one cell passes over into the other ; and of the united contents a large green spore is formed. Soon the old cells decay, and the spore Fig. 564. The growing end of a branching Conferva (Cladophora glomerata), much magnified; showing how, by a kind of budding growth, a new cell is formed by a cross partition separating the newer tip from the older part below ; also, how the branches arise. Fig. 565. Two magnified individuals of a Spirogyra, forming spores by con- jugation; a completed spore at base: above, successive stages of the conjugation are represented. Fig. 566. Closterium acutum, a common Desmid, moderately magnified. It is a single firm -walled cell, filled with green protoplasmic matter. Fig. 567. More magnified view of three stages of the conjugation of a pair of the same. SECTION 17.] TTTAIJ.OPTIYTFS. 171 set free is ready to germinate. Fig. 565 represents several stapes of the Conjugating process, which, however, would never he found all together like this in one pair of threads. 513. Desinids and Diatomes, which are microscopic one-celled plants of the same class, conjugate in the same way. as is shown in a Closterium by Fig. 566, 567- Here the whole living contents of two individuals are in- corporated into one spore, for a fresh start. A reproduction which costs the life of two individuals to make a single new inn- would be fatal to the species if there were not a provision for multiplication by the prompt divi- sion of the new-formed individual into two, and these again into two, and so on in geometrical ratio. And the costly process would be meaningless if there were not some real advantage in such a fresh start, that is, in sexes. 514. There arc other Alga? of the grass-green series which consist of single cells, but which by continued growth form plants of considerable size. Three kinds of these are represented in Fig. 568-574. 515. Lichens, Latin Lichenes, are to be studied in the works of the late Professor Tnckerman, hut a popular exposition is greatly needed. The subjoined illustrations (Fig. 575-580) may simply indicate what some of the commoner forms are like. The cup, or shield-shaped spot, or knob, which bears the fructification is named the Apothecium. This is mainly Fie.. 568. Early sta^c of a species of Hotrydium, a globose cell. 669, 570 of growth. 571. Pull- grown plant, extended and ramified below in i root-like way. :">7"J A Vaucheria; single cell grown on Into a much-branched thread; the eml of some brandies enlarging, and the green contents In one (a) there condensed into :i spore. 573. More magnified riew <>f eoverer, or in compliment to a botanist who has made them known; as, Magnolia Fraseri. named after the botanist F rase r, one 180 NOMENCLATURE. [SECTION 18. of the first to find this species ; and Sarracenia Drummondii, for a Pitcher- plant found by Mr. Drummond in Florida. Such personal specific names are of course written with a capital initial letter. Occasionally some old substantive name is used for the species ; as Maguolia Umbrella, the Um- brella tree, and Ranunculus Flammula. These are also written with a capital initial, and need not accord with the generic name in gender. Geo- graphical specific names, such as Canadensis, Caroliniana , Americana, in the later usage are by some written without a capital initial, but the older usage is better, or at least more accordant with English orthography. 5o8. Varietal Names, when any are required, are made on the plan of specific names, and follow these, with the prefix var. Ranunculus Flam- mula, var. reptans, the creeping variety : R. abortivus, var. micranthus, the small-flowered variety of the species. 539. In recording the name of a plant it is usual to append the name, or an abbreviation of the name, of the botanist who first published it ; and in a flora or other systematic work, this reference to the source of the name is completed by a further citation of the name of the book, the volume and page where it was first published. So " Ranunculus acris, L.," means that this Buttercup was first so named and described by Lin- naeus; " R. multifidus, Pursh," that this species was so named and pub- lished by Pursh. The suffix is no part of the name, but is an abbreviated reference, to be added or omitted as convenience or definiteness may re- quire. The authority for a generic name is similarly recorded. Thus, " Ranunculus, L.," means that the genus was so named by Linnaeus ; " Myosurus, Dill.," that the Mouse-tail was established as a genus under this name by Dillenius ; Caulopbjllum, Michx., that the Blue Cohosh was published under this name by Michaux. The full reference in the last- named instance would be, " in Flora Boreali-Americana, first volume, 205th page," — in the customary abbreviation, "Michx. Fl. i. 205." 540. Names of Orders are given in the plural number, and are com- monly formed by prolonging the name of a genus of the group taken as a representative of it. For example, the order of which the Buttercup or Crowfoot genus, Ranunculus, is the representative, takes from it the name of Ranunculacea ; meaning Planta Ranunculacea when written out in full, that is, Ranunculaceous Plants. Some old descriptive names of orders are kept up, such as Crucifera for the order to which Cress and Mustard belong, from the cruciform appearance of their expanded corolla, and Umbellifera, from the flowers being in umbels. 541. Names of Tribes, also of suborders, subtribes, and the like, are plurals of the name of the typical genus, less prolonged, usually in ea, ineee, idea, etc. Thus the proper Buttercup tribe is Ranunculea, of the Clematis tribe, Clematidea. While the Rose family is Rosacea, the special Rose tribe is Rosea:. 542. Names of Classes, etc. For these see the following synopsis of the actual classification adopted, p. 183. SECTION 18.] TERMINOLOGY. 181 543. Sua plant is named in two words, the generic anil the .specific names, to which may he added a thud, thai of the variety, upon occasion. The generic name is peculiar: obviously il must no! he used twice over in botany. The specific name must not he used twice Over in the same genus, but is free for any other genus. A Querent ullm, or White Oak, is no hindrance to Betula alba, or Whit'' Birch; and so of other names. ."ill Characters and Descriptions. Plants are characterized by a terse statement, in botanical terms, of their peculiarities or distinguishing marks. The character of the order should include nothing which is com- mon to the whole class ii belongs to; that of the genus, nothing wnieh is common to the order; that of the species nothing which is shared with all other species of the genus; and so of other divisions. Descriptions may enter into complete details of the whole structure. 545. Terminology, also called Glossology, is nomenclature applied to organs or parts, and their forms or modifications. Each organ or special part has a substantive name of its own : shapes and other modilicatious of an organ or part are designated by adjective terms, or, when the forms are peculiar, substantive names are given to them. By the correct use of such botanical terms, and by proper subordination of the characters under the order, genus, species, etc., plants may be described and deter- mined with much precision. The classical language of botany is Latin. While modern languages have their own names and terms, these usually lack the precision of the Latin or Latinized botanical terminology. For- tunately, this Latinized terminology has been largely adopted and incor- porated into the English technical language of botany, thus securing pre- cision. And these terms arc largely the basis of specific names of plants. 546. A glossary or vocabulary of the principal botanical terms used in phanerogamous and vascular cryptogamous botany is appended to this volume, to which the student may refer, as occasion arises. § 3. SYSTEM. 547. Two systems of classilication used to be recognized in botany, — the artificial and the natural ; but only the latter is now thought to deserve the name of a system. 548. Artilieial classifications have for object merely the ascertaining of the name and place of a plant. They do not attempt to express relation- ships, but serve as a kind of dictionary. They distribute the genera and species according to some one peculiarity or set of peculiarities (jusl :i^ a dictionary distributes words according to then- first letters), disregarding all other considerations. At present an artilieial classification in botany is needed onlj as a key to the natural orders. — as an aid in referring an unknown plant to its proper family; and BUCh keys arc still very needful, at least for the beginner. Formerly, when the orders themselves were not clearly made out, an artilieial classilication was required to lead the 182 SYSTEM. [SECTION 18. student down to the genus. Two such classifications were long in vogue : First, that of Tournefort, founded mainly on the leaves of the flower, the calyx and corolla : this was the prevalent system throughout the first half of the eighteenth century ; but it has long since gone by. It was suc- ceeded by the well-known 549. Artificial System of Linnaeus, which was founded on the sta- mens and pistils. It consists of twenty-four classes, and of a variable number of orders ; the classes founded mainly on the number and dispo- sition of the stamens ; the orders partly upon the number of styles or stig- mas, partly upon other considerations. Useful and popular as this system was down to a time within the memory of still surviving botanists, it is now completely obsolete. But the tradition of it survives in the names of its classes, Monandria, Diandria, Triandria, etc., which are familiar in terminology in the adjective terms monandrous, diandrous, triandrous, etc. (284) ; also of the orders, Monogynia, Digynia, Trigynia, etc., preserved in the form of monogynous, digynous, trigynous, etc. (301) ; and in the name Cryptogamia, that of the 24th class, which is continued for the lower series in the natural classification. 550. Natural System. A genuine system of botany consists of the orders or families, duly arranged under their classes, and having the tribes, the genera, and the species arranged in them according to their relation- ships. This, when properly carried out, is the Natural System ; because it is intended to express, as well as possible, the various degrees of relation- ship among plants, as presented in nature; that is, to rank those species and those genera, etc., next to each other in the classification which are really most alike in all respects, or, in other words, which are constructed most nearly on the same particular plan. 551. There can be only one natural system of botany, if by this term is meant the plan according to which the vegetable creation was called into being, with all its grades and diversities among the species, as well of past as of the present time. But there may be many natural systems, if we mean the attempts of men to interpret and express that plan, — systems which will vary with advancing knowledge, and with the judgment and skill of different botanists. These must all be very imperfect, bear the impress of individual minds, and be shaped by the current philosophy of the age. But the endeavor always is to make the classification answer to Nature, as far as any system can which has to be expressed in a definite and serial arrangement. 552. So, although the classes, orders, genera, etc., are natural, or as natural as the systematist can make them, their grouping or order of arrangement in a book, must necessarily be in great measure artificial. Indeed, it is quite impossible to arrange the orders, or even the few classes, in a single series, and yet have each group stand next to its nearest relatives on both sides. 553. Especially it should be understood that, although phanerogamous SECTION 18.] SYSTEM. 183 plants are of higher grade than cryptogamous, and angiospermous or or- dinary phanerogamous bigber than the gymnospermous, yel there is no culmination in the vegetable kingdom, nor any highest or lowest order of phanerogamous plants. 554. The particular system most largely used at present in the classi- fication of the orders is essentially the following : — Series I. PHANEROGAM I A ■ Phanerogamous or Flowering Plants. Class I. D1COTYLEDONES ANGIOSPERME^!, called for shortness in English, DICOTYLEDONS or DlCOTYLS. Ovules in a closed ovary. Embryo dicotyledonous. Stem with exogenous plan of growth. Leaves reticulate-veined, Artificial Division I. Polypetal.e, with petals mostly present and distinct. Orders about SO in number, Ranunculacerr to Cornacece. Artificial Division II Gamopktal.e, with gamopctalous corolla. Orders about 45, Caprifoliacea to Planta/jinaccr-. Artificial Division HI. Apetal.e or Incomplete, with perianth, when present, of calyx only. Orders about 35 in number, from Nyctayinacea to Salicacea. Class II. DICOTYLEDONES GYMN OS PERMED, in English Gym- OOSPERMS. No ovary or pericarp, but ovules and seeds naked, and no proper calyx nor corolla. Embryo dicotyledonous or polycotyledonous. Stem with exogenous plan of growth. Leaves mostly parallel-veined. Consists of order Gnetacecr, which strictly connects with Angiospermous Dicotyls, of Con if era, and of Cycadacea. Class III. MONOCOTYLEDONES, in English Monocotyledons or Monocotyls. Angiospermous. Embryo monocotylcdonous. Stem with endogenous plan of growth. Leaves mostly parallel-veined. Division I. Petaloidk.e. Perianth complete, having the equivalent of both calyx and corolla, and all the inner series corolline. About 18 orders. Division II CalyciNjE. Perianth complete (in two series) but not corolline, mostly thickish or glumaceous. Chiefly two orders, Juncaccr, the true Rushes, and Palm*, Palms. Division III SPADK [FLORA or NuDIPLORA. Perianth none, or rudi- mentary and incomplete: inflorescence spadiccous. Of five orders, Tj/phacea and Aroidea the principal. l)ivision IF. GlvmacEjE. Perianth none, or very rudimentary : glumaceous bracts to the flowers. Orders mainly Cyperacem and Oramnea. Series II. CRYPTOGAMIA: Cryptogamous on Plowerless Plants, Ci us I. PTERIDOPHYTA, I'm aiDOPHYTEa I t84) Class 11. BRYOPHYTA, Bryophytes (498) Class 111. T11ALU H'UYTA, Thallophytes <^U3). 184 BOTANICAL WORK. [SECTION 19. Section XIX. BOTANICAL WORK. 555. Some hints and brief instructions for the collection, examination, and preservation of specimens are added. They are especially intended for the assistance of those who have not the advantage of a teacher. They apply to phanerogamous plants and Ferns only, and to systematic botany.1 § 1. COLLECTION, OR HERBORIZATION. 556. As much as possible, plants should be examined in the living state, or when freshly gathered. But dried specimens should be prepared for more leisurely examination and for comparison. To the working botanist good dried specimens are indispensable. 557. Botanical Specimens, to be complete, should have root or root- stock, stem, leaves, flowers, both open and in bud, and fruit. Some- times these may all be obtained at one gathering ; more commonly two or three gatherings at different times are requisite, especially for trees and shrubs. 558. In Herborizing, a good knife and a narrow and strong trowel are needed ; but a very strong knife will serve instead of a trowel or small pick for digging out bulbs, tubers, and the like. To carry the specimens, either the tin box {vasculuni) or a portfolio, or both are required. The tin box is best for the collection of specimeus to be used fresh, as in the class-room : also for very thick or fleshy plants. The portfolio is indispensable for long expeditions, and is best for specimens which are to be preserved in the herbarium. 559. The Vasculum, or Botanical Collecting-box, is made of tin, in shape like a candle-box, only flatter, or the smaller sizes like an English sandwich- case ; the lid opening for nearly the whole length of one side of the box. Any portable tin box of convenient size, and capable of holding specimens a foot or fifteen inches long, will answer the purpose. The box should shut close, so that the specimens may not wilt : then it will keep leafy branches and most flowers perfectly fresh for a day or two, especially if slightly moistened. They should not be wet. 560. The Portfolio is best made of two pieces of solid binder's-board, covered with enamel cloth, which also forms the back, and fastened by straps and buckles. It may be from a foot to twenty inches long, from nine to eleven or twelve inches wide. It should contain a needful quantity of smooth but strong and pliable paper (thin so-called Manilla paper is best), either fastened at the back as in a book, or loose in folded sheets when not very many specimens are required. As soon as gathered, the specimens should be separately laid between the leaves or in the folded sheets, and kept under moderate pressure in the closed portfolio. 1 For fuller directions in many particulars, see "Structural Botauy," pp. 370- 374. SECTION 19.] HERBORIZATION. 185 561. Of small herbs, especially annuals, the whoie plant, root and all, should be taken l'or a specimen. Of larger ones branches will suffice, with some leaves from near the root. Enough of the root or subterranean part of the plant should be collected to show whether it is an annual, a biennial, or a perennial. Thick roots, bulbs, tubers, or branches of speci- mens intended to be pressed should be thinned with a knife, or cut into slices. Keep the specimens within the length of fifteen or sixteen inches, by folding, or when that cannot be done, by cutting into lengths. 562. For Drying Specimens a good supply of soft and unsized paper is wanted; and some convenient means of applying considerable pressure. To make good dried botanical specimens, dry them as rapidly as possible between many thicknesses of sun-dried paper to absorb their moisture, under as much pressure as can be given without crushing the more delicate parts. This pressure may be had by a botanical press, of which various forms have been contrived; or by weights placed upon a board, — from forty to eighty or a hundred pounds, according to the quantity of specimens drying at the time. For use while travelling, a good portable press may be made of thick binders' boards for the sides, and the pressure may be applied by strong straps with buckles. Still better, on some accounts, are portable presses made of wire network, which allow the dampness to escape by evaporation between the meshes. For herborization in a small way, a light wire-press may be taken into the field and made to serve also as a portfolio. 563. It is well to have two kinds of paper, namely, driers of bibulous paper, stitched into pads (or the pads may be of thick carpet-paper, cut to size) and thin smooth paper, folded once ; the specimens to be laid into the fold, either when gathered or on returning from the excursion. These sheets are to hold the specimens until they are quite dry. Every day, or at first even twice a day, the specimens, left undisturbed in their sheets, are to be shifted into fire-dried or sun-dried fresh driers, and the pressure renewed, while the moist sheets are spread out to dry, so as to take their turn again at the next shifting. This course must be continued until the specimens are no longer moist to the touch. Good and comely specimens are either made or spoiled within the first t went y-four or thirty-six hours. After that, when plenty of driers are used, it may not be necessary to change them so frequently. 564. Succulent plants, which long refuse to part witli life and moisture, and Spruces and some other evergreens which are apt to east off their leaves, may be plunged for a moment into boiling water, all but the flowers. Delicate flowers may be encased in thin tissue paper when put into the press. Thick parts, like the heads of Sun-flowers and Thistles, may be cut in two or into sin 565. Dried specimens may be packed in bundles, either in folded paper or upon single halt-sheets. It is better that such paper should not be bibulous, The packages should be well wrapped or kept in close cases. 186 BOTANICAL WORK. [SECTION 19. 566. Poisoning is necessary if specimens are to be permanently pre- served from the depredation of insects. The usual application is an almost saturated solution of corrosive sublimate in 95 per cent alcohol, freely ap- plied with a large and soft brush, or the specimens dipped into some of the solution poured into a large and flat dish; the wetted specimens to be transferred for a short time to driers. § 2. HERBARIUM. 567. The botanist's collection of dried specimens, ticketed with their names, place, and time of collection, and systematically arranged under their genera, orders, etc., forms a Hortus Siccus or Herbarium. It com- prises not only the specimens which the proprietor has himself collected, but those which he acquires through friendly exchanges, or in other ways. The specimens of an herbarium may be kept in folded sheets of paper; or they may be fastened on half-sheets of thick and white paper, either by gummed slips, or by glue applied to the specimens themselves. The former is best for private and small herbaria; the latter for large ones which are much turned over. Each sheet should be appropriated to one species ; two or more ditferent plants should never be attached to the same sheet. The generic and specific name of the plant should be added to the lower right-hand corner, either written on the sheet, or on a ticket pasted down; and the time of collection, the locality, the color of the flowers, and any other information which the specimens themselves do not afford, should be duly recorded upon the sheet or the ticket. The sheets of the herbarium should all be of exactly the same dimensions. The herbarium of Linnaeus is on paper of the common foolscap size, about eleven inches long and seven wide. This is too small. Sixteen and three eighths iuches by eleven and a half inches is an approved size. 568. The sheets containing the species of each genus are to be placed in genus-covers, made of a full sheet of thick paper (such as the strong- est Manilla-hemp paper), to be when folded of the same dimensions as the species-sheet but slightly wider: the name of the genus is to be writ- ten on one of the lower corners. These are to be arranged under the orders to which they belong, and the whole kept in closed cases or cabi- nets, either laid flat in compartments, like " pigeon-holes," or else placed in thick portfolios, arranged like folio volumes. All should be kept, as much as practicable, in dust-proof and insect-proof cases or boxes. 569. Fruits, tubers, and other hard parts, too thick for the herbarium, may be kept in pasteboard or light wooden boxes, in a collection apart. Small loose fruits, seeds, detached flowers, and the like may be conven- iently preserved in paper capsules or envelopes, attached to the herbarium, sheets. SECTION 19.] INVESTIGATION AND DETERMINATION. 187 § :;. INVESTIGATION \\h DETERMINATION OF PLANTS. 570. The Implements required arc a hand magnifying glass, a pocket lens of an inch or two locus, or a glass of two lenses, oue of the lower and tin: other of the higher power; and a sharp penknife for dissection. With these and reasonable perseverance the structure of the flowers and fructification of most phanerogamous plants and Ferns can be made out. But for ease and comfort, as well as for certainty and right training, the student should have some kind of simple stage microscope, and under this make all dissections of small parts. Without it the student will be apt to fall into the bad habit of guessing where he ought to ascertain. 571. The simple microscope may be reduced to a good lens or doublet, of an inch focus, mounted over a glass stage, so that it can be moved up and down and also sidewise, and with (or without) a little mirror under- neath. A better one would have one or two additional lenses (say of half and of a quarter inch focus), a pretty large stage, on the glass of which several small objects can be placed and conveniently brought under the lens ; and its height or that of the lens should be adjustable by a rack- work ; also a swivel-mounted little mirror beneath, which is needed for minute objects to be viewed by transmitted light. 572. For dissecting and displaying small parts on the stage of the microscope, besides a thin-bladed knife, the only tools needed arc a good stock of common needles of various sizes, mounted in handles, and one or more saddler's-needles, which, being triangular, may be ground to sharp edges convenient for dissection. Also a pair of delicate-pointed forceps; those with curved points used by the dentist are most convenient. A cup of clean water is indispensable, with which to moisten or wet, or in which occasionally to float delicate parts. Small flowers, buds, fruits, and seeds of dried specimens can be dissected quite as well as fresh ones. They have only to be soaked in warm or boiling water. 573. The compound microscope is rarely necessary except in crypto- gamic botany and vegetable anatomy; but it is very useful and convenient, especially for the examination of pollen. To the advanced botanist it is a ity, to all students of botany an aid and delight. 574. Analysis. A few directions and hints may be given. The mod important is this: In studying an unknown plant, make a complete ex- amination of all its parts, and form a clear idea of its floral structure and that of its fruit, from pericarp down to the embryo, or as far as the materials in hand allow, before taking a step toward timlmu' out its name and relationship by means of the keys or other helps wlneli the Manuals and Floras provide. If it is the name merely that is wanted, the shorter way is to ask some one who already knows it. To verify the points of structure oue by one as they happen to occur in an artificial key, without any preparatory investigation, is a usual but is not the best nor the surest 188 BOTANICAL WORK. [SECTION 19. way. It is well to make drawings or outline sketches of the smaller parts, and especially diagrams of the plan of the flower, such as those of Fig. 225, 227, 241, 244, 275-277. For these, cross sections of the flower-bud or flower are to be made : and longitudinal sections, such as Fig. 270-274, are equally important. The dissection eveu of small seeds is not difficult after some practice. Commonly they need to be soaked or boiled. 575. The right appreciation of characters and terms used in description needs practice and calls for judgment. Plants do not grow exactly by rule and plummet, and measurements must be taken loosely. Difference of soil and situation are responded to by considerable variations, and other divergences occur which cannot be accounted for by the surroundings, nor be anticipated in general descriptions. Annuals may be very depauperate in dry soils or seasons, or very large when particularly well nourished. Warm and arid situations promote, and wet ones are apt to diminish pubes- cence. Salt water causes increased succulence. The color of flowers is apt to be lighter in shade, and brighter in open and elevated situations. A color or hue not normal to the species now and then occurs, which nothing in the conditions will account for. A white-flowered variation of any other colored blossom may always be expected ; this, though it may be notable, no more indicates a distinct variety of the species than an albino would a variety of the human species. The numerical plan is subject to variation in some flowers ; those on the plan of five may now and then vary to four or to six. Variations of the outline or lobing of leaves are so familiar that they do not much mislead. Only wider and longer observation suf- fices to prevent or correct mistakes in botanical study. But the weighing of evidence and the balancing of probabilities, no less than the use of the well-ordered and logical system of classification, give as excellent training to the judgment as the search for the facts themselves does to the observing powers. §4. SIGNS AND ABBREVIATIONS. 576. For a full account of these, whether of former or actual use, see " Structural Botany " of the " Botanical Text Book," pp. 367, 392, as also for the principles which govern the accentuation of names. It is needful here to explain only those used in the Manuals and Floras of this country, for which the present volume is an introduction and companion. They are not numerous. 577. In arranging the species, at least those of a large genus, the divi- sions are denoted and graduated as follows : The sign § is prefixed to sec- tions of the highest rank : these sections when they have names affixed to them (as Prunus § Cerasus) may be called subgenera. When the divi- sions of a genus are not of such importance, or when divisions are made under the subgenus itself, the most comprehensive ones are marked by as- terisks, * for the first, * * for the second, and so on. Subdivisions are SECTION 19.] SIGNS AND ABBREVIATIONS. 189 marked with a prefixed +-; those under this head with**; and those under this with , if there be so mam grades. A .similar notation is fol- lowed in the synopsis of tin; genera of an order. 578. The interrogation point i> used m botany to indicate doubt. Thus Clematis crispa, L.V expresses a doubt whether the plant in question is really the Clematis erispa of Linnaeus. Clematis ? polypetala expresses a doubt whether the plant so named is really a Clematis. On the other hand the exclamation point (!) is used to denote certainty whenever there is special need to ailirm this. 571). For size or height, the common signs of degrees, minutes, and seconds, have been used, thus, 1°, 2', 3", stand respectively for a foot, two inches, and three lines or twelfths of an inch. A better way, when such brevity is needed, is to write lft. 2in. 31. 580. Signs for duration used by Linnccus were © for an annual, £ for a biennial, % for a perennial herb, 5 f°>' a shrub or tree. DeCandolle brought in 0 for a plant that died after once flowering, (l) if annual, (2) if biennial. 581. To indicate sexes, 0 means staminate or male plant or blossom; 9 , pistillate or female ; g , perfect or hermaphrodite. 582. To save room it is not uncommon to use coin place of "many ; " thus, " Stamens oo," for stamens indefinitely numerous : " co flora " for pluriflora or many-flowered. Still more common is the form " Stamens 5-20," or "Calyx 4- 5-parted," for stamens from five to twenty, calyx four-parted or live-parted, and the like. Such abbreviations hardly need explanation. 583. The same may be said of such abbreviations as Cat, for calyx, Cor. for corolla, Pet. for petals, St. for stamens, Pist. for pistil, Hah. for habitat, meaning place of growth, Herb, for herbarium, Hort. for garden. Also /. c, loco citato, which avoids repetition of volume and page. 584. "Structural Botany " has six pages of abbreviations of the names of botanists, mostly of botanical authors. As they are not of much consequence to the beginner, while the more advanced botanist will know the names in full, or know where to find them, only a selection is here appeuded. 190 ABBREVIATIONS OF THE NAMES OF BOTANISTS. ABBREVIATIONS OF THE NAMES OP BOTANISTS. Adan*. = Adanson. Gmel. — Gmelin. Ait. Aiton. Good. Goodenough. All. Allioni. Grev. Greville. Andr. Andrews. Griseb. Grisebach. Am. Aub. Arnott. Aublet. Gron. Gronov. > Gronorius. Bartr. Bartram. Hall. Haller. Beam). Palisot de Beauvois. Ilartm. Hartmann. Benth. Bentham. Hartw. Hartweg. Bern A. Bernhardi. Haru. Harvey. Bigel. Jacob Bigelow. Haw. Haworth. Bong. Bongard. H eg elm. Hcgelmaier. Bon pi. Bonpland. II em si. Hemsley. Br. or R. Br. Robert Brown. Herb. Herbert. Cass. Cassini. Hoffm. Hoffmann. Cav. Cavanilles. Hoffmans. Hoffmansegg. Cham. Charaisso. Hook. Hooker. Chapm. Chapman. Hook.f. J. D. Hooker. Chois. Choisy. Hornem. Horuemann. Clayt. Clayton. Huds. Hudson. Curt. Curtis. II nmb. Humboldt. [Kunth. Curt. (M. A.) M. A. Curtis. HBK. Humboldt, Bonpland, and Bar/. Darlington. Jacq. Jacquin. DC. > DeCandolle. Jacq.f. J. F. Jacquin. DeCand. Juss. Jussieu. A. DC. Alphonse DeCandolle. A. Juss. Adrien de Jussieu, Desc. Descourtilz. Kit. Kitaibel. Desf. Desfontaines. L. or Linn Linnaeus. Desv. Desvaux. Labill. Labillardiere. Bill, Dillenius. Lag. Lagasca. Dough Douglas. Lam. Lamarck. Duham. Duhamel. Ledeb. Ledebour. Dun. Dunal. Lehm. Lehmann. Eat. Eaton (Amos) or D. C. Lesq. Lesquereux. Ehrh. Ehrhart. Less. Lessing. Ell. Elliott. Lestib. Lestibudois. Endl. Endlicher. L'Her. L'Heritier. Engelm. Engelmann. Lindb. Lindberg. Engl. Engler. Lindh. Lindheimer. Fisch. Fischer. Lindl. Lindley. Freel, Froelich. Lodd. Loddiges. Gartn. Gaertner. Loud. Loudon. Gaud. Gaudin. M. Bieb. Marschall von Bieberstein. Gaudich. Gaudichaud. Marsh. Marshall (Humphrey). Gijtg. Gingins. Mart. Martius. ABBREVIATIONS OF THE NAMES OF BOTANISTS. 191 Mast. = - Masters. Iuii)i.,\- Seh tit. = Reenter & Schultcs. Ma. rim. M a \ unowicz. Rutt/j. Kuuboeli. Meitn. ) Meisner or I Meissner. R/ipr. Ruprecht. Mtiun. St. Hi/. Saint -llilaire. Mickx. or M ./. Michanx. Salis/j. Salisbury. Miehx.f. P. A. Michaux. Schk. Schkuhr. Mi//. Miller. Sch/cc/it. SchlcchtcndaL Miq. Miqnel. Schrad. Schrader. Mitch. Miicht'll. Schreb. Schreher. Moc. Mo9ino. Schwein. Sihwciuitz. Moq. Moquiu-Tandon. Scop. Scopoli. Moric. Moricand. Spreng Sprenf a fruit, such ai the raspberry. Acorn, the nut of the Oak, 122. Acotyledonoue, destitute of cotyledons or seed-leaves. ; ions, growing from the apex, as the stems ,,i Ferns and If oases. Acrogtnt, or Acrogenoiu Plants, n name tor the vascular cryptogamous plants, 156. Aculeate, armed With prickles, i. e. nrulei ; as the Rose and Brier. Acukolate, armed with small prickles, or slightly prickly. Acuminate, taper-pointed, .">(. Acute, merely sharp-pointed, or ending In a point less than a right angl 13 194 GLOSSARY AND INDEX. Adelphous (stamens), joined in a fraternity (adelphia); see monadelphous, &c. Aden, Greek tor gland. So Adenophorous, gland-bearing. Adherent, sticking to, or more commonly, growing fast to another body. Adnate, literally, growing fast to, born adherent, 95. The anther is adnate when fixed by its whole length to the filament or its prolongation, 101. Adnatkm, the state of being adnate, 94. Adpressed or appressed, brought into contact with, but not united. Adscendent, ascendent, or ascending, rising gradually upwards, 39. Adsurgent, or assurgent, same as ascending, 39. Adventitious, out of the proper or usual place; e. g. Adventitious buds, 30. Adventive, applied to foreign plants accidentally or sparingly introduced into a country, but hardly to be called naturalized. ^Equilateral, equal-sided ; opposed to oblique. Aerial roots, &c, 36. JEruginous, verdigris-colored. vEstival, produced in summer. ^Estivation, the arrangement of parts in a flower-bud, 97. Agamous, sexless. Aggregate fruits, 118. Agrestis, growing in fields. Air-cells or Air-passages, spaces in the tissue of leaves and some stems, ]31. Air- Plants, 36. Akene or Akenium, 120. Ala (plural, alee), a wing; the side-petals of a papilionaceous corolla, 92. Alabastrum, a flower-bud. A lar, situated in the forks of a stem. Alate, winged. A Ibescent, whitish, or turning white. Albus, Latin for white. Albumen of the seed, nourishing matter stored up with the embryo, 21, 127. Albumen, a vegetable product, of four elements. Albuminous (seeds), furnished with albumen, 21. Alburnum, young wood, sap-wood, 142. Alliaceous, with odor of garlic. Allogamous, close fertilization. Alpestrine, subalpine. Alpine, belonging to high mountains above the limit of forests. Alternate (leaves), one after another, 29, 67. Petals are alternate with the sepals, or stamens with the petals, when they stand over the intervals between them, 82. Alveolate, honeycomb-like. Ament. the scaly spike of trees like the Birch and Willow, 75. Amentaceous, catkin-like, or catkin-bearing. Amorphous, shapeless, without any definite form. Amphicarpous, producing two kinds of fruit. Amphigastrium (plural, amphigastria), a peculiar stipule-like leaf of Liverworts. Amphitropous, ovules or seeds, 111. Amphora, a pitcher-shaped organ. Amplectant, embracing. Amplexicaul (leaves), clasping the stem by the base. Ampullaceous, swelling out like a bottle or bladder (ampulla). Amylaceous, Amyloid, composed of starch (amylum), or starch-like. Anandrous, without stamens. Anantherous, without anthers. Ananthous, destitute of flowers ; flowerless. Anastomosing, forming a net-work (anastomosis), as the veins of leaves, 50. Anatnpous ovules or seeds, 111. Ancipital (anceps), two-edged. Andrcecium, a name for the stamens taken together, 98. GLOSSARY ami INDEX. 195 Andro-dicBciout, flowers starainate on one plant, perfect on another. Androgynous, having both staniinate and pistillate Rowers in the same cluster. Androphore, a column of united stamens, as in a Hallow. Androus, or Audi r, andra, andrum, Greek in compounds for male, or stamens. Anemophilous, mud-loving, said of wind-fertilizable Bowers, 113. Anfractuose, bent hither and thither as the anthers of the Squash, be Angiospt runr, Angiospermousi with seeds formed in an ovary or pericarp, 109. Angular divcrgenci of leaves, 69. /IfUMM, unequal. Anisomerous, parts unequal in Dumber. Anisopetalous, with on- equal petals. Anisopkyllous, the leaves unequal in the pairs. ^Htuiaj (plant), flowering and fruiting the year it i-< raised from the seed, and then dying, 37. Annular, in the form of a ring, or forming a circle. Annulate, marked by rings; or furnished with an Annulus, or ring, like that of the Bpore-case of most Perns. Tn Mosses it is a ring of cells placed between the mouth of the Bpore-case and the li'l in many B] • AnnoHnous, yearly, or In yearly growths. Anterior, in the blossom, is the part next the bract, i. e. external; while the posterior side is that next the axis of inflorescence. Thus, in the Pea, <.v<-., the keel is anterior, and the standard posterior, 96. Ant In la, an open paniculate cyme. Anther, the essential part of the stamen, which contains the pollen, 14, 80, 101, Antheridiutn (plural antheridia), the organ in Cryptogams which answers to the anther of Flowering Plants, 150. Antheriferous, anther-bearing. Antkesis, the period or the act of the expansion of a flower. Anthocarpus (fruits), 118. Anihophort, a stipe between calyx and corolla, 113. Anihos, Greek for flower; in composition. Monanthous, one-flowered, &c. Anticous, same as anterior. Antrorse, directed upwards or forwards. Apetatous, destitute of petals, 86. Aphyllous, leafless. Apical, belonging to the apex or point. Apiculaie, pointleted; tipped with a small point. Apocarpous (pistils), when the several pistils of the same flower are separate. Apophysis, any irregular swelling ; the enlargement at the base of the Bpore-case <>f the Umbrella-Moss. Apothedum, the fructification of Lichens, 171. Appendage, any superadded part. Appendiculate, provided with appendages. Appressed, rinse pressed to the stem, fee. Apricus, growing in dry and sunny places. Apterous, wingless. Aquatic [AqwUilis), living or growing in water ; applied to plants whether growing under water, or with all but the base raised out of it. Arachnoid, AraneoSO, cobwebby; el, ,thed with, or COnsisI in- of, BOft downy fibres. Arboreous, Arborescent, tree-like, in size or form, :'.'.». Arbort turn, a collection of trees. Arrhi t/oiiium (plural arche'/mila), the organ in IfoSSeS, \c, which (fl analogous to the pistil of Flowering Plants. Arcuate, bent or curved I ik** ■ bow. Arenas* (Arenarius), growing in sand. Art olate, marked nut into little spaces or an ok*. Argenteous, or Argentate, Bilvery-like, Argillost , growing in clay. Argos, Greek for pure white; Argophyllous or Argyrophyllous, white-leaved, &c. Argutus, acutely dentate. 196 GLOSSARY AND INDEX. Arillate (seeds) furnished with an aril. Arilliform, aril-like. A /■Hi us, or Aril, a fleshy growth from base of a seed, 126. Aristate, awned, i. e. furnished with an arista, like the beard of Barley, &c, 54. Aristulate, diminutive of the last; short-awned. Arrect, brought into upright position. Arrow-shaped or Arrow-headed, same as sagittate, 53. Articulated, jointed ; furnished with joints or articulations, where it separates or inclines to do so. Articulated leaves, 57. Artificial Classification. 181. Ascending (stems, &c.), 39; (seeds or ovules) 110. Ascidium, a pitcher-shaped body, like leaves of Sarracenia. Ascus (asci), a sac, the spore-case of Lichens and some Fungi. Asperyilliform, shaped like the brush used to sprinkle holy water; as the stigmas of many Grasses. Asperous, rough to touch. Assimilation, 144, 147. Assurgent, same as ascending, 39. Atropous or Atropal (ovules), same as orthotropous. Aurantiacous, orange-colored. Aureous, golden. Auriculate, furnished with auricles or ear-like appendages, 53. Autogamy, self-fertilization, 115. Awl-shaped, sharp-pointed from a broader base, 61. Awn, the bristle or beard of Barley, Oats, &c; or any similar appendage. Awned or Awn-pointed, furnished with an awn or long bristle-shaped tip, 54. Axil, the angle on the upper side between a leaf and the stem, 13. Axile, belonging to the axis, or occupying the axis. Axillary (buds, &c), occurring in an axil, 27. Axis, the central line of any body ; the organ round which others are attached ; the root and stem. Ascending and Descending Axis, 38. Baccate, berried, berry-like, of a pulpy-nature like a berry {baccm). Badius, chestnut-colored. Banner, see Standard, 92. Barbate, bearded; bearing tufts, spots, or lines of hairs. Barbed, furnished with a barb or double hook ; as the apex of the bristle on the fruit of Echinospermum (Stickseed), &c. Bnrbellate% said of the bristles of the pappus of some Compositse when beset with short, stiff hairs, longer than when denticulate, but shorter than when plumose. Barbellulate, diminutive of barbellate. Bark, the covering of a stem outside of the wood, 138, 140. Basal, belonging or attached to the Base, that extremity of any organ by which it is attached to its support. Basifixed, attached by its base. Bast, Bast-fibres, 134. Beaked, ending in a prolonged narrow tip. Bearded, see barbate. Beard is sometimes used for awn, more commonly for long or stiff hairs of any sort. Bell-shaped, of the shape of a bell, as the corolla of Harebell, 90. Berry, a fruit pulpy or juicy throughout, as a grape, 119. Bi- (or Bis), in compound words, twice ; as Biarticulate, twice-jointed, or two-jointed; separating into two pieces. Biauriculate, having two ears, as the leaf in tig. 126. Bicallose, having two callosities or harder spots. Bicarinaie, two-keeled. Bicipital (Biceps), two-headed; dividing into two parts. GLOSSARY AND INDEX. 197 Biconjuyate, twice paired, u when a petiole forks twin'. Bidentate, having two teeth (not twice or doubly dentate). BiennicU, of two years' continuance; springing from the seed one season, floweriug and dyiii^ the next. •".^. Bifarious, two-ranked; arranged in two rows. Bifida two-cleft to about the middle. Bifoliolate, a compound leaf of two leaflets, "''.'• Bifurcate, twice forked; or more commonly, forked into two branches. Bijuyate, bearing two pairs (of leaflets, &c.). Bilabiate, two-lipped, as the corolla of Labiates. BUamellate, of two plates {lamella), as the stigma of Mhnulus. inhibit!, the same as two-lobed. Bilocellate, when a cell is divided into two locelli. Bilocular, two-celled; as most anthers, the pod of Foxglove, &C. Binary, in twos. Bmate, in couples, two together. Bipartite, the Latin form of two-parted. Binodal, of two nodes. Binomial, of two words, as the name of genus anil species taken together, 180. Bipdlmate, twice palmately divided. Biparous, bearing two. Bipumate (leaf), twice pinnate, 58. Bipinnatijirf , twice pinnatifid. 57 '. Bipinnatuect, twice pinnately divided. B'plicate, twice folded together. BiserialyOr Biseriate, occupying two rows one within the other. Buerrate, doubly serrate, as when the teeth of a leaf are themselves serrate. Bisexual, having both stamens and pistil. Bitemate, twice ternate; i. e. principal divisions three, each bearing three leal! Bladdery, thin and inflated. Blade of a leaf, its expanded portion, 49. Bloom, the whitish powder on some fruits, leaves, &c. Bout-shaped, concave within and keeled without, in shape like a small boat. Bonier of corolla, &c, 89. Brachiate, with opposite branches at right angles to each other. Brachy-, short, as Brackycarpotu, short-United, &c. Bract (Bractea), the leaf of an inflorescence. Specially, the bract is the small leaf or scale from the axil of which a flower or its pedicel proceeds, 73. Bracteate, furnished with bracts. Bracteolate, furnished with bractlets. Bracteose, with numerous or conspicuous bracts. Bractlet | Bracteola), or Bracteole, D a brad seated on the pedicel or flower-stalk, 73. Branch, Brunch iny, '21. Breathiny-pores, 144. Bristles, stiff, sharp hairs, or any very slender bodies of similar appearance. Bristly, beset with bristles. Bristle-pointed, 54. Briiino ous, brown. Brush-shaped, ><•«• aspergilliform. Bryoloyy, that pari of botany which relates to Moss Bryaphyta, Bryophytes, 168. Bud, a branch in its earliesl or undeveloped state, 27. Bud-scales, 63 Bulb, a leaf hud with fleshy scales, asuallj subterranean, 46 Bulbils, diminutive bulbs. Bulbi/i rous, bearing or producing bulbs, Bulbose or bulbous, bulb-like in shape, dec Bulblets, small bulbs, borne above /round. 16 Bulb scales, 16. Bullate, appearing as if blistered or bladdery (from bulla ■ bubble). Byssacevus, composed of line Max dike threads. 198 GLOSSARY AND INDEX. Caducous, dropping off very early, compared with other parts ; as the calyx in the Poppy, falling when the flower opens. Cairuleous, blue. Ccerulescent, becoming bluish. Ccespitose, or Cespituse, growing in turf-like patches or tufts. Calathiform, cup-shaped. Calcarate, furnished with a spur (calcar), 86, 87. Calceolate or Calceiform, slipper-shaped, like one petal of the Lady's Slipper. Callose, hardened ; or furnished with callosities or thickened spots. Calvous, bald or naked of hairs. Calycijlorus, when petals and stamens are adnate to calyx. Calycine, belonging to the calyx. Calyculate, furnished with an outer accessory calyx (calyculus) or set of bracts looking like a calyx, as in true Pinks. Calyptra, the hood or veil of the capsule of a Moss, 163. Calyptrate, having a calyptra. Calyptriform, shaped like a calyptra or candle-extinguisher. Calyx, the outer set of the floral envelopes or leaves of the flower, 14, 79. Cambium, Cambium-layer, 140. Campanulate, bell-shaped, 90. Campy lotropous, or Campylotropal. curved ovules and seeds, 111. Campylospermous, applied to fruits of Umbelliferae when the seed is curved in at the edges, forming a groove down the inner face; as in Sweet Cicely. Canaliculate, channelled, or with a deep longitudinal groove. Cancellate, latticed, resembling lattice-work. Candidus, Latin for pure white. Canescent, grayish-white; hoary, usually because the surface is covered with fine white hairs. Incanous is whiter still. Canous, whitened with pubescence; see incanous. Capillaceous, Capillary, hair-like in shape; as fine as hair or slender bristles. Capitate, having a globular apex, like the head on a pin. Capitellate, diminutive of capitate. Capitulum, a close rounded dense cluster or head of sessile flowers, 74. Capreolate, bearing tendrils (from capreolus, a tendril). Capsule, a dry dehiscent seed-vessel of a compound pistil, 122. Capsular, relating to, or like a capsule. Capture of insects, 154. Carina, a keel ; the two anterior petals of a papilionaceous flower, 92. Carinate, keeled, furnished with a sharp ridge or projection on the lower side. Cariopsis, or Caryopsis, the one-seeded fruit or grain of Grasses, 121. Carneous, flesh-colored; pale red. Carnose, fleshy in texture. Carpel, or Carpidium, a simple pistil or a pistil-leaf, 106. Carpellary, pertaining to a carpel. Carpology, that department of botany which relates to fruits. Carpophore, the stalk or support of a pistil extending between its carpels, 113. Carpos, Greek for fruit. Cartilaginous, or Cartilagineous, firm and tough in texture, like cartilage. Caruncle, an excrescence at the scar of some seeds, 126. Carunculate, furnished with a caruncle. Caryophyllaceous, pink-like: applied to a corolla of 5 long-clawed petals. Cassideous, helmet-shaped. Cassus, empty and sterile. Catenate, or Catenulate, end to end as in a chain. Catkin, see Ament, 75. Caudate, tailed, or tail-pointed. Caudex, a sort of trunk, such as that of Palms; an upright, rootstock, 39, 44. Caudicle, the stalk of a pollen-mass, &c. Caulescent, having an obvious stem, 36. GLOSSARY AND INDEX. 199 Caulicle, I little stein, or rudimentary stem (of a seedling), 11, 127. Cauline, of or belonging to a Mini, 3t>. Caulis. Latin name of stem. Caulocarpic, equivalent to perennial. Cavfome, t lie cauline parts of a plant. CeW (diminutive, CelltUe), the cavity of an anther, ovary, &C.; one of the anatomi- cal elements, 181. Cellular Cryptogams, 162. Cellular tissue, 131. Cellulose, 131. Cell-walls, 130. Centrifugal (inflorescence), produced or expanding in succession from the centre outwards, 77. Centripetal, the opposite of centrifugal, 74. Cephala, Greek for head. In compounds, Sfonoctpkahus, with one head, .1/icro- cephalvus, small-headed, &c. Cereal, belonging to corn, or corn-plants. Cernuous, nodding; the summit more or less inclining. Chaita, Greek for bristle. Chaff, small membranous scales or bracts on the receptacle of Composite; the glumes, &c, of grasses. Chaffy, furnished with chaff, or of the texture of chaff. Chalaza, that part of the ovule where all the parts grow together, lit), 126. Channelled, hollowed out like a gutter; same as canaliculate. Character, a phrase expressing the essential marks of a species, genus, &a, 181. Chartaceous, of the texture of paper or parchment. Chloros, Greek for green, whence Chloranthuus, green-flowered; Chlorucarpous, green-fruited, Sec. Chlorophyll, leaf green, 136. Chlorosis, a condition in which naturally colored parts turn green. Choripetalous, same as polypetalous. Churisis, separation of the normally united parts, or where two or more parts take the place of one. Chromule, coloring matter in plants, especially when not green, or when liquid. Chrysos, Greek for golden yellow, whence Ckrgsanthous, yellow-flowered, &c. Cicatrix, the scar left by the fall of a leaf or other organ. Ciliate, beset on the margin with a fringe of cilia, i. e. of hairs or bristles, like the eyelashes fringing the eyelids, whence the name. Cinereous, or Cineraceous, ash-grayish; of the color of ashes. Cirriiiute, rolled inwards from the top, 72. Circumscis-;ilr, or Circumcimle, divided by a circular line round the sides, as the pods of Purslane, Plantain, Sec., 1-24. Circumscription, general outline. Cirrhiferous, or Cirrhnse, furnished with a tendril (Latin, Cirrhus): as the (Grape- vine. Cirrhose also means resembling or coiling like tendrils, as the leaf- stalks of VirginVbower. More properly Cfrrtuand Cirruse CitreOHi, lemon-yellow. Cladas, ed, see clavate. Clustere contorted, 97. ( ordate, heart-shaped, 53. Coriaceous, resembling leather in texture. Corky, of the texture of cork. Corky layer <»f bark, 141. Conn, ■ solid bulb, like that Of Crocus, 45. Corneous, of the consistence or appearance of horn. Comiculate, furnished with a small horn or spur. Cornute, horned; bearing a horn-like projection or appendage. Corolla, the leaves of the flower within the calyx, 14, 79. Corollaceous, CoroUine, like or belonging to a corolla. ( 'orona, a coronet or crown; an appendage at the top of the claw of some petals, 91. Coronate, crowned; furnished with a crown. Cortex, bark. Cortical, belonging to the bark (cortex). Corticate, coated with bark or bark-like covering. Corymb, a flat or convex indeterminate flower-cluster, 74. Corymbiferous, bearing corymbs. Corymbose, in corymbs, approaching the form of a corymb, or branched in that way. Costa, a rib; the midrib of a leaf, &C. Costate, ribbed. Cotyledons, the proper leaves of the embryo, 11, 127. Crateriform, goblet-shaped or deep saucer-shaped. Creeping (steins), growing flat on or beneath the ground and rooting, 39. Cremocarp, a half-fruit, or one of the two carpels of Umbelliferae, 121. Crenate, or Crenelled, the edge scalloped into rounded teeth, 55. Crenulate, minutely or slightly crenate. Crested, or Cristate, bearing any elevated appendage like a crest. Cretaceous, chalky or chalk-like. Cribrote, or cribriform, pierced like a sieve with small apertures. Crinite, bearing long hairs. Criapate, curled or crisp\\ Croceous, saffron-color, deep reddish-yellow. Cross-breeds, the progeny of interbred varieties, 176. Cross fertilization, 115. Crown, see corona. Crowned, see coronate. Cruciate, or Cruciform, cross-shaped. Cruciform Corolla, 86. Crustaceous, hard and brittle in texture; crust-like. Cryptoyamuus Plants, Cryptogams, 10, 156. Cryptos, concealed, as Oryptopetalous, with concealed petals, &c. Crystals in plants, 137. Cucullate, hooded, or hood-shaped, rolled up like a cornet of paper, or a hood (cucullus), as the spathe of Indian Turnip, 75. Culm, a straw; the stem of Grasses and Sedges, 39. < 'nitrate, shaped like a trowel or broad knife. Cuneate, Cuneiform, wedge-shaped, 53. Cup-ekaped, same as cyathiform or near it. Cupule, a little cup; the cup to the acorn of the Oak, 122. Cupular, or Cupulate, provided with a cupule CupuUferoui, cupule-bearing. Currireint >/, with curved ribs or veins. Curviserial, in oblique or spiral ranks. Cushion, the enlargement at the insertion or base of a petiole. Cuspidate, tipped with a sharp and stiff point or cusp, 54. Cut, same as incised, or applied generally to any sharp and deep division, 5& Cuticle, the ^kin of plants, or more strictly ita external pellicle. ( yaneous, bright blue. Cyathiform, In the sha] I a cup, or particularly of a wine-glass. Cycle, one complete turn of a spire, or a circle, 70. 202 GLOSSARY AND INDEX. Cyclical, rolled up circularly, or coiled into a complete circle. Cyclosis, circulation in closed cells, 149. Cylindraceous, approaching to the Cylindrical form, terete and not tapering. Cymboeform, or Cynibiform, same as boat-shaped. Cyme, a cluster of centrifugal inflorescence, 77. Cymose, furnished with cymes, or like a cyme. Cymule, a partial or diminutive cyme, 77. Deca- (in words of Greek derivation), ten; as Decagynous, witli 10 pistils or styles, Decamerous, of 10 parts, Decandrous, with 10 stamens, &c. Deciduous, falling off, or subject to fall; said of leaves which fall in autumn, and of a calyx and corolla which fall before the fruit forms. Declinate, declined, turned to one side, or downwards. Decompound, several times compounded or divided, 59. Decumbent, reclined on the ground, the summit tending to rise, 39. Decurrent (leaves), prolonged on the stem beneath the insertion, as in Thistles. Decussate, arranged in pairs which successively cross each other, 71. Deduplication, same as chorisis. Definite, when of a uniform number, and not above twelve or so. Definite Inflorescence, 72. De flexed, bent downwards. Deflorate, past the flowering state, as an anther after it has discharged its pollen. Dehiscence, the regular splitting open of capsule or anther, 103, 119. Dehiscent, opening by regular dehiscence, 119, 123. Deliquescent, branching off so that the stem is lost in the branches, 32. Deltoid, of a triangular shape, like the Greek capital a. Demersed, growing below the surface of water. Dendroid, Dendritic, tree-like in form or appearance. Dendron, Greek for tree. Deni, ten together. Dens, Latin for tooth. Dentate, toothed, 55. Denticulate, furnished with denticulations, or little teeth. Depauperate, impoverished or starved, and so below the natural size. Depressed, flattened or as if pressed down from above. Derma, Greek for skin. Descending, tending gradually downwards. Descending axis, the root. Desmos, Greek for things connected or bound together. Determinate Inflorescence, 72. Dextrorse, turned to the right hand. Di- Dis (in Greek compounds), two, as Diadelphous (stamens), united by their filaments in two sets, 99. Diagnosis, a short distinguishing character or descriptive phrase. Dialypetalous, same as polypetalous. Diandrous, having two stamens, &c. Diaphanous, transparent or translucent. Dicarpellary , of two carpels. Dichlamydeous (flower), having both calyx and corolla. Dichogamous, Dichogamy, 116. Dichotomous, two-forked. Diclinous, having the stamens in one flower, the pistils in another, 85. Dicoccous (fruit), splitting into two cocci or closed carpels. Dicotyls, 23. Dicotyledonous (embryo), having a pair of cotvledous, 23. Dicotyledonous Plants, 23, 182. Didymous, twin. Didynamous (stamens), having four stamens in two pairs, 100. Diffuse, spreading widely and irregularly. GLOSSARY AND INDEX. 203 Digitate (tinkered), where the leaflets of a compound leaf art- all borne ou the apex of the petiole, 58. Digynous (flower), having two pistils or styles, 105. Dimerous, made up of two parts, or its organs in twos. Dimidiate, halved; as where a leaf or leaflet has only one side developed. Dimorphism, 117. Dimorphous, Dimorphic, of two forms, 117. Diacious, or Dioicous, with stamena and pi-til> on different plant-, 85. Dipetalous, of two petals. Diphyllous, two-leaved. DipUrous, two-winged. Diplo-, Greek fur double, as Diplostemonous, with two sets of stamens. Disciform or Dish-shaped, Bat and circular, like a disk or quoit. Discoidal, or Discoid, belonging to or like a disk. Discolor, of two different colors or hues. Discrete, separate, opposite of concrete. Disepalous, of two sepals. Disk, the face of any Mat body; the central part of a head of flowor-, like the Sun- Mower, or Coreopsis, as opposed to the ray or margin; a Meshy expansion of the receptacle of a Mower, 113. Dish-flowers, those of the disk in (Join posit, v. Dissected, cut deeply into many lobes or divisions. Dissepiments, the partitions of a compound ovary or a fruit, 108. Dissident, bursting in pieces. Distichous, two-ranked. Distinct, uncombined with each other, 95. Dithzcous, of two theca? or anther-cells. Divaricate, straddling; very widely divergent. Divided (leaves, &c), cut into divisions down to the base or midrib, 55. Dodeca, Greek for twelve: as Dodecagynous, with twelve pistils or styles, Dode- candrous, with twelve stamens. Dodrans, span-long. Dolabriform, axe-shaped. Dorsal, pertaining to the back (dorsum) of an organ. Dorsal Suture, 106. Dotted Ducts, 148. Double Flowers, where the petals are multiplied unduly, 79. Downy, clothed with a coat of soft and short hairs. Drupaceous, like or pertaining to a drupe. Drupe, a stone-fruit, 120. Drupelet or Drupel, a little drupe. Ducts, the so-called vessels of plants, 134- Dumose, bushy, or relating to bushes. Duramen, the heart-wood, 142. Dwarf, remarkably low in stature. E-, as a prefix of Latin compound words, means destitute of; as erostate, without a rib or midrib; exalbuminous, without albumen, &C. Eared, see auriculate, 53. Ehracteate, destitute of bracts. Ebracteolate, destitute of hractlets. Ebumeous, ivory-white. Echinate, armed with prickles (like a hedgehog). Echinulatc, a diminutive of it. Edentate, toothless Effete, past bearing, &c; said of anthers which have discharged their pollen. Effuse, very loosely branched and spreading. Eglattdulose, destitute of glands. Elaters, thread.- mixed with the spore- of Liverworts, 1G5. Ellipsoidal, approaching an elliptical figure. Elliptical, oval Or oblong, with the ends regularly rounded, 02. Emarginate, notched at the summit. r>4. Embryo, the rudimentary plantlei in ■ need, 11, 127. Embryonal, belonging or relating to the embryo. Embryo-sac, 117. 204 GLOSSARY AND INDEX. Emersed, raised out of water. Endecagynous, with eleven pistils or styles. Endecandrous, with eleven stamens Endemic, peculiar to the country geographically. Endocarp, the inner layer of a pericarp or fruit, 120. Endochrume, the coloring matter of Algas and the like. Endogenous Stems, 138. Endogenous plants, an old name for monocotyledons. Endopleura, inner seed-coat. Endorhizal, radicle or root sheathed in germination. Endosperm, the albumen of a seed, 21. Endostome, the orifice in the inner coat of an ovule. Ennea-, nine. Enneagynous, with nine petals or styles. Enneandrous, nine-stamened Ensate, Ensiform, sword-shaped. Entire, the margins not at all toothed, notched, or divided, but even, 55. Entomophilous, said of flowers frequented and fertilized by insects, 113. Ephemeral, lasting for a day or less, as the corolla of Purslane, &c. Epi-, Greek for upon. Epicalyx, such an involucel as that of Malvaceae. Epicarp, the outermost la}*er of a fruit, 120. Epidermal, relating to the Epidermis, or skin of a plant, 50, 141, 143. Epigozous, growing on the earth, or close to the ground. Epigynuus, upon the ovary, 95, 99. Epipetalous, borne on the petals or the corolla, 99. Epiphyllous, borne on a leaf. Epiphyte, a plant growing on another plant, but not nourished by it, 36. Epiphytic or Epiphytal, relating to Epiphytes. Epipterous, winged at top. Episperm, the skin or coat of a seed, especially the outer coat. Equal, alike in number or length. Equally pinnate, same as abruptly pinnate, 57. Equitant (riding straddle), 60. Erion, Greek for wool. Erianthous, woolly-flowered. Eriophorous, wool-bearing, &c. Erose, eroded, as if gnawed. Erostrate, not beaked. Erythros, Greek for red. Erythrocarpous, red-fruited, &c. Essential Organs of the flower, 80. Estivation, see cestivation. Etiolated, blanched by excluding the light, as the stalks of Celery. Eu, Greek prefix, meaning very, or much. Evergreen, holding the leaves over winter and until new ones appear, or longer. Ex, Latin prefix; privative in place of "e" when next letter is a vowel. So Ex- alate, wingless; Exalbuminous (seed), without albumen, 21. Excurrent, running out, as when a midrib projects beyond the apex of a leaf, or a trunk is continued to the very top of a tree, 32. Exiguous, puny. Exilis, lank or meagre. Eximius, distinguished for size or beauty. Exo-, in Greek compounds, outward, as in Exocarp, outer layer of a pericarp, 120. Exogenous, outward growing. Exogenous steins, 139. Exorhizal, radicle in germination not sheathed. Exostome, the orifice in the outer coat of the ovule. Explanate, spread or flattened out. Exserted, protruding out of, as the stamens out of the corolla. Exstipulate, destitute of stipules. Extine, outer coat of a pollen-grain. Extra-axillary, said of a branch or bud somewhat out of the axil, 31. Extrorse, turned outwards; the anther is extrorse when fastened tc the filament oa the side next the pistil, and opening on the outer side, 101. GLOSSARY A\h INDEX. 205 Falcate, scythe-shaped; a flat body curved, it- edges parallel. / . Raa mi 8, 7S. Family, in botany same as Order, 177. Farina, meal or starchy matter, 136. Farinaceous, mealy in texture. Farinose, covered with a mealy powder* FasdaU , banded ; also applied to monstrous stems which grow Sat. FascicU , a close cluster, 77. Fascicled, Fasciculated, growing in a bundle or toft, a- the leaves "t Larch, OS, and r..nts of Peony, 36. Fastigiate, close, parallel, and upright, as the branches of Lombardy Poplar. Faux (plural, fauces), the throat of a calyx, corolla, &c., 89. Faveolate, Favose, honeycombed; Bame as alveolate. Feather-veined, with veins of a leaf all springing from the sides of a midrib, 51. Fecula or Fojcula, starch, L36. Female flower or plant, one bearing pistil- only. Fenestrate, pierced with one or more targe holes, like window-. F> rrugineous, or Ferruginous, resembling iron-rust; red-grayish. /■'< rtile, fruit-bearing, <>r capable of it; also said of anthers producing good pollen. Fertilization, the process by which pollen causes the embryo to be formed, 114. Fibre (woody), 133. Fibrous, containing much libre, or composed of fibres. Fibrillose, formed of small fibres, or Fibrillar. Fibro-vascular bundle or tissue, formed of fibres and vessels. Fiddle-shaped, obovate with a deep recess on each side. Fidus, Latin Buffix for cleft, as Bijid, two-cleft. Filament, the stalk of a stamen, 14, 80, 101; also any slender thread-shaped body. Filamentose, or Filamentous, bearing or formed of slender threads* Filiform, thread-shaped; long, slender, and cylindrical. Fimbriate, fringed; furnished with fringes (fimbria). Fimbrillate, Fimbrilliferous, bearing smsAl fimbria, i. Q.JimbrilUp. Fissiparous, multiplying by division of oue body into two. Fissus, Latin for split or divided. Fistular, or Fistulose, hollow and cylindrical, as the leaves of the Onion. Flabelliform, or Flabellate, fan-shaped. Flagellate, or Flagelliform, long, narrow, and flexible, like the thong of a whip; or like the runners (flayellce) of the Strawberry. Flavescent, yellowish, or turning yellow. Flavus, Latin for yellow. Fleshy, composed of tirm pulp or flesh. vlexuose, or Flexuous, bending in opposite directions, in a zigzag way. floating, swimming on the surface of water. Floccose, composed of or bearing tufts of Woolly or long and soft hairs. Flora (the goddess of (lower-), the plants of a country or district, taken together, or a work systematically describing them, 9. Floral Envelopes, or Flower-leaves, 7!». Floret, a diminutive flower, one of a mass or cluster. Floribund, abundantly floriferous. Florula, the flora of a small district. Flos, floris, Latin for (lower. Flosculus, diminutive, same as floret. Flower, the whole organs of reproduction of Phamogamous plants, 14, 7J. Flower-bud, an unopened (lower. Flowering Plants, 10, 150. Flowerless Flouts, 10, 150. Fly-trap /> aves, 66. Fluitans, Latin for floating. Fhtviatile, belonging to ■ river or stream* Foliaceous, belonging to, or of the texture or nature of, ■ leal {folium). Foliate, provided with leave-. Latin prefixes denote the number of have-. Hate, trifoliate, 8pp. Folios*, leafy; abounding in leaves. Folivlate, relating to or bearing leaflets (foliola) ; trifoliate, with three leafli 206 GLOSSARY AND INDEX. Folium (plural, folia), Latin for leaf. Follicle, a simple pod, opening down the inner suture, 122. Follicular, resembling or belonging to a follicle. Food of Plants, 144. Foot-stalk, either petiole or peduncle, 41). Foramen, a hole or orifice, as that of the ovule, 110. Foraminose, Foraminulose, pierced with holes. Forked, branched in two or three or more. Fornicate, bearing fori) ices. Fornix, little arched scales in the throat of some corollas, as of Comfrey. Foveate, deeply pitted. Foveolate, diminutive of foveate. Free, not united with any other parts of a different sort, 95. Fringed, the margin beset with slender appendages, bristles, &c. Frond, what answers to leaves in Ferns, &c, 157; or to the stem and reaves fused into one, as in Liverwort. Frondescence, the bursting into leaf. Frondose, frond-bearing; like a frond, or sometimes used for leafy. Fructification, the state or result of fruiting. Fructus, Latin for fruit. Fruit, the matured ovary and all it contains or is connected with, 117. Fruit-dots in Ferns; see Sorus. Frustulose, consisting of a chain of similar pieces, or Frustules. Frutescent, somewhat shrubb}'; becoming a shrub {Frutex), 39. Fruticulose, like a small shrub, or Fruticulus. Fruticose, shrubby, 39. Fugacious, soon falling off or perishing. Fulcrate, having accessory organs or fulcra, i. e. props. Fulvous, tawny; dull yellow with gray. Fungus, Fungi, 172. Funicle, Fun'u idus, the stalk of a seed or ovule, 110. Funnelform, or funnel-shaped, expanding gradually upwards into an open mouth, like a funnel or tunnel, 90. Furcate, forked. Furfuraceous, covered with bran-like fine scurf. Furrowed, marked by longitudinal channels or grooves. Fuscous, deep gray-brown. Fusiform, spindle-shaped, 36. Galbalus, the fleshy or at length woody cone of Juniper and Cypress. Galea, a helmet-shaped body, as the upper sepal of the Monkshood, 87. Gcdeate, shaped like a helmet. Gamopetalous, of united petals, 89. Gamophyllous, formed of united leaves. Gamosepalous, formed of united sepals, 89. Geminate, twin ; in pairs. Gemma, Latin for a bud. Gemmation, the state of budding; budding growth. Gemmule, a small bud; the plumule, 6. Genera, plural of genus. Geniculate, bent abruptly, like a knee (genu), as many stems. Generic Names, 179. Genus, a kind of a rank above species, 177. Germ, a growing point; a young bud; sometimes the same as embryo, 127. Germen, the old name for ovary. Germination, the development of a plantlet from the seed, 12. Gerontogmous, inhabiting the Old World. Gibbous, more tumid at one place or on one side than the other. Gilvous, dirty reddish-yellow. Glabrate, becoming glabrous with age, or almost glabrous. Glabrous, smooth, in the sense of having no hairs, bristles, or other pubescence. GLOSSARY AND INDEX. 207 Oladiate, sword-shaped, as the leave* 01 Iris. Glands, Bmall cellular organs which secrete oily or aromatic or other products; they are - etimes Mink in tin leaves 01 rind, as in the Orange, Prickly Ash, &< sometimes on the Burface as small projections; sometime* raised on hairs or bristles (glandular hairs, <)<■), as in the Sweetbrier and Sundew. Tin name is also given to any small Bwellings, &c, whethei they secrete anything or not; so thai the word is loosely used. Glandular, Glandulvse, furnished with glands, or gland-like. Giant (Gland), the acorn 01 mast ol I >ak and similar fruits. Glareose, growing in gravel. Glaucttcent, slightly glaucous, or bluish-gray. Glaucous, covered with a bloom, vi/.. with a iin<' white powder of wax that rubs off, like that on a fiesh plum, or a cabbage-leaf. Globose, Bpherical in form, or nearly so. Globular, nearly globose. Glochidiate, or Glochideous, (bristles) barbed; tipped with barbs, or with a double hooked point. Glomerate, closely aggregated into a dense cluster. Glomerule, a dense head-like cluster, 77. Glossology, the department of botany in which technical terms are explained. Glumaceuus, glume-like, or glume- bearing. Glumt ; Glumes are the husks or floral coverings of Grasses, or, particularly, the outer husks or bracts of each spikelet. Glumelles, the inner husks of Grasses. Gonophore, a stipe below stamens, 113. Gossypine, cottony, flocculent. Gracilis, Latin for slender. Grain, see Caryopsis, 121. Gramineous, grass-like. Granular, composed of grains. Granule, a small grain. Graveolent, heavy-scented. Griseous, gray or bluish-gray. Growth, 129." Grumous, or Grumose, formed of coarse clustered grains. (j'uttate, spotted, as if by drops of something colored. Gymms, (ireek for naked, as Gymnocarpous, naked-fruited. Gymnospermous, naked-seeded, 109. Gymnospermous gynoscium, 109. Gymnospt rmos, or Gymnospermous Plants, 18-3. Gynandrous, with Btamens borne on, i.e. united with, the pistil, 99. Gynacium, a name for the pistils of a flower taken altogether, 105. Gynobase, a depressed receptacle or support of the pistil or carpels, 114. Gynophore, a stalk raising a pistil above the stamens, lb!. Gynosteyium, a sheath around pistils, of whatever nature. Gynostemium, name of the column in Orchids, JCC., consisting of style and stigma with stamens combined. Gyrate, coiled or moving circularly. • , Btrongly bent to and fro. Habit, the general aspeel of a plant, or its mode of growth. Habitat, th.- situation or country in which a plant grows in a wild state. Hairs, hair-like growths on the surface of plants. //airy, beset with hair-, especially longish ones Halberd-shaped, see hastate, ■<■'•. Hire/, when appearing a- if one half of the body were cut away. Hamate, or Hamost, hooked ; tin- end of a Blender body bent round. Hamutost . bearing 1 small book : ■ diminutive of the last. Haplo-, in (ireek compounds, single; as Haptostemonous, liaving only one series of stamens. 208 GLOSSARY AND INDEX. Hastate, or Hostile, shaped like a halberd; furnished with a spreading lobe on each side at the base, 53. Head, capitulum, a form of inflorescence. 74. Heart-shaped, of the shape of a heart as painted on cards, 53. Heart-wood, the older or matured wood of exogenous trees, 142. Helicoid, coiled like a helix or snail-shell, 77. Helmet, the upper sepal of Monkshood is so called. Helvolous, grayish-yellow. Hemi- in compounds from the Greek, half; e. g. Hemispherical, &c. Hemicarp, half-fruit, one carpel of an Umbelliferous plant, 121. Hemitropous (ovule or seed), nearly same as amphitropous, 123. Hepta- (in words of Greek origin), seven; as Heptagynous, with seven pistils or styles. Heptumerous, its parts in sevens. Heptandrous, having seven stamens. Herb, plant not woody, at least above ground. Herbaceous, of the texture of an herb; not woody, 39. Herbarium, the botanist's arranged collection of dried plants, 186. Herborization, 184. Hermaphrodite (flower), having stamens and pistils in the same blossom, 81. Hesperidium, orange-fruit, a hard-rinded berry. Hetero-, in Greek compounds, means of two or more sorts, as Heterocarpous, bearing fruit of two kinds or shapes. Heterogamous, bearing two or more sorts of flowers in one cluster. Heterogony, Heterogone, or Heterogonous, with stamens and pistil reciprocally of two sorts, 116. Heterostyled is same. Heteromorphous, of two or more shapes. Heterophyllous, with two sorts of leaves. Heterotropous (ovule), the same as amphitropovs, 123. Hexa- (in Greek compounds), six; as Hexagonal, six-angled. Hexagynous, with six pistils or styles. Hexamerous, its parts in sixes. Hexandrous, with six stamens. Hexapterous, six-winged. Hibernaculum, a winter bud. Hiemal, relating to winter. Hilar, belonging to the hilum. Hilum, the scar of the seed; its place of attachment, 110, 126. Hippocrepiform, horseshoe-shaped. Hirsute, clothed with stiffish or beard-like hairs. Hirtellous, minutely hirsute. Hispid, bristly, beset with stiff hairs. Hispidulous, diminutive of hispid. Histology, 9. Hoary, grayish-white ; see canescent, &c. Holosericeous, all over sericeous or silky. Homo-, in Greek compounds, all alike or of one sort. Homodromous, running in one direction. Homogamous, a head or cluster with flowers all of one kind. Homogeneous, uniform in nature; all of one kind. Homogone, or Hmogonous, counterpart of Heterogone or Homostyled. Homologous, of same type; thus petals and sepals are the homologues of leaves. Homomallous (leaves, &c), originating all round an axis, but all bent or curved to one side. Homorphous, all of one shape. Homntropous (embryo), curved with the seed ; curved only one way. Hood, same as helmet or galea. Hooded, hood-shaped; see cucullate. Hooked, same as hamate. Horn, a spur or some similar appendage. Horny, of the texture of horn. Hortensis, pertaining to the garden. Hortus Siccus, an herbarium, or collection of dried plants, 201. Humifuse, Humistrate, spread over the surface of the ground. Humilis, low in stature. GLOSSARY A.ND 1NDE . Hyaline, transparent, or partly bo. Hybrid, a cross-breed between two allied Bpecies, 176. Hydrophytes, water-plants. J/i/i null, -ee flit null. II i it "i a Mushroom, 1 7 -J . Hypanthium, a hollow flower-receptacle, Buch as that of R . Greek prefix for under, or underneath. Hypocotyle, or Hypocotyl, part of stem below t h<- cotyledo is, 11. Hypocratertform, properly HypocraU rimorphous, salver-shaped. • «, or Hypogcewis, produced underground, IU. ynous, inserted under the pi-til, '.•.">. 99. anthous, with the blossoms developed earlier than the leavi Icosandrous, having 20 (or 12 or more) Btamens insert i d on tin- calyx. Imln i/>i>. Latin for beardless. Imbricate, Imbricated, Imbricative, overlapping one auother, His'- tile- or -hin_rles (.ii a roof, a- tli'- bud-scales of Horse-chestnut and Hickory, 27. In cestivation, where some leaves of tin- calyx or corolla arc overlapped "ii both Bidet by others, 98 Immarginate, destitute of a rim or border. Immersed, growing wholly under water. fmpari-pinnate, pinnate with a single leaflet at tin- apex. r>7. Imperfi ctfiovoi rs, wanting either stamens or pistils, $5. Inaquilateral, unequal-sided, a- the leaf of a Begonia, /inane, empty, -aid of an anther which produces no pollen, >.\:c. fnappendiculate, nol appendaged. fncanous, fncanescent, lioary with soft white pubescence. Incarnate, flesh-colored. Incised, cat rather deeply and irregularly, 58. Included, enclosed; when tin- part in question does nut projeel beyond another. Incomplete /■'!<>»■<.■■, wanting calyx or corolla, 86. IncrassaU r pubescence. Induplicate, with the edges turned inward-. 97. Induviate, clothed with old and withered part- or indutHB. Indusium, the shield or covering of a fruit-dot of a Fern, 159. Inermis, Latin for unarmed, not prickly. [hj'i rior, growing below - ■ other organ, 96. Infertile, not producing seed, or pollen, a- thecase may be. Inflated, turgid and bladdery. hill, .n tie- verj apex of the filament 101. Innovation, a yonng shoot, <>r new growth / Hon, the place or the i !-• of attachment oi to its support, 95. 99. ■ r, entire, n « • t lobed. Integi rrimus, quite entire, nol serrate. 14 210 GLOSSARY AND INDEX. Intercellular Passages or Spaces, 131, 143. Interfuliaceous, between the leaves of a pair or whorl. Internode, the part of a stem between two nodes, 13. Interpetiular, between petioles. Interruptedly pinnate, pinnate with small leaflets intermixed with larger. Intine, inner coat of a pollen grain. Intrafoliaceous (stipules, &c), placed between the leaf or petiole and the stem. Introrse, turned or facing inwards; i. e. towards the axis of the flower, 101. Jntruse, as it were pushed inwards. Inversed or Inverted, where the apex is in the direction opposite to that of the organ it is compared with. Involucel, a partial or small involucre, 76. Involucellate, furnished with an involucel. lnvolucrate, furnished with an involucre. Involucre, a whorl or set of bracts around a flower, umbel, or head, &c, 71, 75. Involute, in vernation, 72; rolled inwards from the edges, 97. Irregular Flowers, 86, 91. Isos, Greek for equal in number, fsomerous, the same number in the successive cir- cles or sets. Isustemonous, the stamens equal in number to the sepals or petals. Jointed, separate or separable at one or more places into pieces, 61, &c. Jugum (plural Juga), Latin for a pair, as of leaflets, — thus Unijugate, of a single pair ; Bijugate, of two pairs, &c. Julaceus, like a catkin or Julus. Keel, a projecting ridge on a surface, like the keel of a boat; the two anterior petals of a papilionaceous corolla, 92. Keeled, furnished with a keel or sharp longitudinal ridge. Kermesine, Carmine-red. Kernel of the ovule and seed, 110. Key, or Key-fruit, a Samara, 122. Kidney-shaped, resembling the outline of a kidney, 53. Labellum, the odd petal in the Orchis Family. Labiate, same as bilabiate or two-lipped, 92. Labi at (flora us, having flowers with bilabiate corolla. Labium (plural, Labia), Latin for lip. Lacerate, with margin appearing as if torn. Laciniate, slashed; cut into deep narrow lobes or Lacinice. Lactescent, producing milky juice, as does the Milkweed, &c. Lacteus, Latin for milk-white. Lacumse, full of holes or gaps. lAicustrine, belonging to lakes. Lceviyate, smooth as if polished. Latin, Lavis, smooth, as opposed to rough. Lageniform, gourd-shaped. Lagopous, Latin, hare-footed; densely clothed with long soft hairs. Lamellar or Lamellate, consisting of flat plates, Lamella?. Lamina, a plate or blade, the blade of *\ leaf, &c, 49. Lanate, Lanose, woolly; clothed with long and soft entangled hairs. Lanceolate, lance-shaped, 52. Lanuginous, cottony or woolly. Latent buds, concealed or undeveloped buds, 30. Lateral, belonging to the side. Latex, the milk}' juice. &c., of plant-, 135. Lax (Isixns), loose in texture, or sparse: the opposite of crowded. Leaf, 49. Leaf-buds. 31 Leaflet, one of the divisions or blades of a compound leaf, 57. Leaf-like, same as foliaceovs Leathery, of about the consistence of leather; coriaceous. GLOSSARY AND INDEX 211 Legume, a simple pod which dehisces in two pieces, like that of the Pea, 122. Leguminous, belonging to legumes, <>r tn the Leguminous Family. Lenticular, lens-shaped j i. e. flattish and convex on both Bides. L i/ipaceous, bur-like. /.asio, Greek for woolly or hairy, a^ Lasianthus, woolly-flowered. Lati ritiout, brick-colored. Laticiferous, containing latex, l'!8. Latus, Latin for broad, as Latif alius, broad-leaved. Leaf-sear, Leafstalk, petiole. Lt nticels, lenticular dots on young bark. Lenliginuse, as if freckled. Lepal, a made-up word for a Btaminode. Lepis, Greek for a scale, whence Lepidote, leprous; covered with scurfy scales. Leptoe, Greek tor slender: so Leptophyllous, Blender-leaved. Leukos, Greek for white; whence Leueanthous, white-flowered, &c. Liber, the inner bark of Exogenous steins, 140. Lid, see operculum. Ligneous, or Lignose. woodv in texture. Ligulate, furnished with a ligule, 93. Ligule, Ligula, the strap-shaped corolla in many Composite, 93; the membranous appendage at the summit of the leaf-sheaths of most Grasses, 57. Limb, the border of a corolla, &C., 89. Limbate, bordered (Latin, Limbus, a border). Line, the twelfth of an inch ; or French lines, the tenth. Linear, narrow and flat, the margins parallel, 52. Lineate, marked with parallel lines. Lineolate, marked with minute lines. Lingulate, Linguiform, tongue-shaped. Lip, the principal lobes of a bilabiate corolla or calyx, 92. Litoral or Littoral, belonging to the shore. Livid, pale lead-colored. Lobe, any projection or division (especially a rounded one) of a leaf, &C. Lobed or Lobate, cut into lobes, 55, 56; Lobulate, into small lobes. Locellate, having Locelli, i. e. compartments in a cell: thus an anther-cell is often bilocellate. Loculament, same as loculus. Locular, relating to the cell or compartment (Loculus) of an ovary, &C. Loculicidal (dehiscence), splitting down through the back of each cell, 123. Locusta, a name for the spikelet of Grasses. Lodicule, one of the scales answering to perianth-leaves in Grass-flowers. Lament, a pod which separates transversely into joints, 122. Lomentaceous, pertaining to or resembling a toment Lornt, , thong-shaped. Lunate, crescent-shaped. Lunulate, diminutive of lunate. Lu/iuline, like hops. Lusus, Latin for a sport or abnormal variation. Luteolut, yellowish; diminutive of Lut, us. Latin for yellow. Lutescmt, verging to yellow. Lj/rate, lyre-shaped; a pinnatifid leaf of an obovateor Bpatulate outline, the end- lobe large and roundish, ami the lower loins small, is in fig. 14!'. Macros, Greek for long, Munetimes also used for large: thus Macrophyllous, long- or large-leaved, &c. .\facrospore, the large kind of spore, when there are two kinds, 160, 16L Maculate, spotted or blotched. Mai, ( (lowers or plants), having stamens but no pistil Mammose, breast-shaped. Marcescent, withering without falliug off. Marginal, belonging to margin. 212 GLOSSARY AND INDEX. Marginate, margined with an edge different from the rest. MaryinicidaL dehiscence, 123. Maritime, belonging to sea-coasts. Marmorate, marbled. Mas., Masc, Masculine, male. Masked, see personate. Mealy, see farinaceous. Median, Medial, belonging to the middle. Medifixed, attached by the middle. Medullary, belonging to, or of the nature of, pith (Medulla); pithy. Medullary Rays, the silver-grain of wood, 140, 141. Medullary Sheath, a set of ducts just around the pith, 140. Meiustemonous, having fewer stamens than petals. Membranaceous or Membranous, of the texture of membrane; thin and soft. Meniscoid, crescent-shaped. Mencarp. one carpel of the fruit of an Umbelliferous plant, 121. Merismatic, separating into parts by the formation of partitions across. Mtrous, from the Greek for part; used with numeral prefix to denote the number of pieces in a set or circle: as Monomerous, of only one, Dimerous, with two, Tri- merous, with three parts (sepals, petals, stamens, &c) in each circle. Mesocarp, the middle part of a pericarp, when that is distinguishable into three layers, 120. Mesophlazum, the middle or green bark. Micropyle, the closed orifice of the seed, 110, 126. Microspore, the smaller kind of spore when there are two kinds, 161. Midrib, the middle or main rib of a leaf, 50. Milk-vessels, 138. Miniate, vermilion-colored. Mitriform, mitre-shaped: in the form of a peaked cap, or one cleft at the top. Moniliform, necklace-shaped; a cylindrical body contracted at intervals. Monocarpic (duration), flowering and seeding but once, 38. Monochlamydeous, having only one floral envelope. Monocotyled-r< , a name for the ribs or vein- of leaves when ^1 n i j »!•• and parallel, 50. Nerved, furnished with nerves, or Bimple and parallel ribs or veins, 50. Nervose, conspicuously nerved. Nervulose, minutely nervose. Netted-veined, furnished with branching veins forming network, f»0, 51. Neuter, Neutral, sexless. Neutral flower, T'.». Nigi r, Latin for black. Nigricans, Latin for verging to black. Nitid, Bhining Nival, living in or near snow. Nivt us, snow-white. Nodding, bending bo that the summit hangs downward. Node, a knot; tho "joints " of a stem, or the part whence a leaf or a pair of leaves springs, 13. Nodose, knotty or knobby. Nodulose, furnished with little knobs or knots. Nomenclature, 175, 17'.». Normal, according to rule, natural. Notate, marked with spots or lines of a different color. Nucamentaceous, relating to or resembling a small nut Nudform, nut-shaped or nut-like. Nucleus, the kernel of an ovule (110) or seed (127) of a cell. Nucule, same as nutlet. Nude, (Latin. Nadus), naked. So Nudicaulis, naked-stemmed, &C. Nut, Latin Nux, a hard, mostly one-seeded indehisceiit fruit; as a chestnut, butter- nut, acorn, 121. Nutant, nodding. Nutlet, a little nut; or the stone of a drupe. Ob- (meaning over against), when prefixed to words signifies inversion; as, Ob- compntHd, flattened the opposite of the usual way: Obcordate, heart-shaped, with the broad and notched end at the apex instead of the l»ase, 54; OUance- olate, lance-shaped with the tapering point downwards, 52. Oblique, applied t<> leaves. Sec, mean- unequal-sided. Oblong, from two to four time- a- long a- broad, 59. Obovate, inversely ovate, tin- broad end upward, 53. Obovoid, solid obovate. Obtuse, blunt or round at the end, 54. Obverm , same a- invent, ObvoluU (in the bud), when the margins id one piece or leaf alternately overlap those of the opposite one. Ocellate, with a circular colored patch, ike an eye. Ochroleucous, yellowish-white: dull cream-color. Ocreate, furnished with Ocrea (boots . or stipules in the form of sheaths, 57. Octo-, i.atin for eight, enters into the composition of Octagynous, with eight pi-tils or styles; Octanun-us, its parts In eights; Uclandrous, with eight stamen-, fiec. 214 GLOSSARY AND INDEX. Oculate, with eye-shaped marking. Officinal, used in medicine, therefore kept in the shops. Offset, short branches next the ground which take root, 40. Oides, termination, from the Greek, to denote likeness; so Dianthoides, Pink-like. Oleraceous, esculent, as a pot-herb. Oligos, Greek for few; thus Oligantkous, few-flowered, &c. Olivaceous, olive-green. Oophoridium, a name for spore-case containing macrospores. Opaque, applied to a surface, means dull, not shining. Operculate, furnished with a lid (Operculum), as the spore-case of Mosses, 163. Opposite, said of leaves and branches when on opposite sides of the stem from each other (i. e. in pairs), 29. 68. Stamens are opposite the petals, &c, when they stand before them. Oppositifolius, situated opposite a leaf. Orbicular, Orbiculnte, circular in outline, or nearly so, 52. Order, group below class. 178. Ordinal names, 180. Organ, any member of the plant, as a leaf, a stamen, &c. Organography, study of organs, 9. Organogenesis, that of the development of organs. Orqyalis, of the height of a man. Orthos, Greek for straight; thus, Orthocarpous, with straight fruit; Orthosttchous, straight-ranked. 0rthot7-opous (ovule or seed), 111. Osseous, of a bony texture. Outgrowths, growths from the surface of a leaf, petal, &c. Oval, broadly ellipticnl, 52. Ovary, that "part of the pistil containing the ovules or future seeds, 14, 80, 105. Ovate, shaped like an egg, with the broader end downwards; or, in plain surfaces, such as leaves, like the section of an egg lengthwise, 52. Ovoid, ovate or oval in a solid form. Ovule, the body which is destined to become a seed, 14, 80, 105, 110. Ovuliferous, ovule-bearing. Palate, a projection of the lower lip of a labiate corolla into the throat, as in Snap- dragon, &c. Palea (plural palea:), chaff; the inner husks of Grasses; the chaff or bracts on the receptacle of many Compositse, as Coreopsis, and Sunflower. Paleaceous, furnished with chaff, or chaffy in texture. Paleolate, having Paleolce or paleae of a second order, or narrow paleap. Palet, English term for palea. Palmate, when leaflets or the divisions of a leaf all spread from the apex of the petiole, like the hand with the outspread fingers, 57, 58. Palmately (veined, lobed, INDEX. 215 Paraphi/fes, jointed filament* mixed with the entheridia of Mbeset« Parotitic, living a> a parasite, i. <•. <>n another plant or animal, 37. Parenchemytous, composed of parenchyma. Parenchyma, soft cellular tissue of plants, like the green pulp of leaves, 132. Parietal (placenta'. &c.), attached to the walls (patietes) of the ovary. Paripmnate, pinnate with an even number oJ Leaflets. /'arte/, separated or cleft into parts almost t<> the base, 55. Partkenogi \netis, producing seed without fertilization. Partial involucre, same as an involved; partial /n(i<>l<. a division of a main leaf- stalk or the stalk of a leaflet: partial peduncle, a branch ol a peduncle: par- tial uinln I, an umbellet, 7t». Partition, a segment of :\/> ri mtli, the leaves of the flower collectively, 7'.». /'< ricarp, the ripened ovary; the walls of the fruit, 1 17. /'. ricarpic, belonging t<> the pericarp. Perigonium, Peri gone, same sa perianth, Perigynium, bodies around the pistil; applied to the closed cup or hottle-shaped body (of bracts) which encloses the ovary of Sedges, and to the bristles, little scales, &c., of the Sowers of some other Cyperacess. Perigynous, the petals and stamens borne on the calyx, 96, 99. Peripheric, around the outside, or periphery, of any organ. Perisperm, a name for the albumen of a -<-, d, /'. nstomt , iii.- fringe of teeth to tin spore i ase -t M nt, remaining beyond the period when such parts commonly fall, a- thu leaves of evergreens, and the calyx of such (lowers a- persist during the growth of the fruit. 216 GLOSSARY AND INDEX. Personate, masked; a bilabiate corolla with a palate in the throat, 92. Perfuse, perforated with a hole or slit. Perulute, having scales [Perula), such as bud-scales. /''.<. pedis, Latin for the foot or support, whence Longipes, long-stalked, &c. ]'< tal, a leaf of the corolla, 14, 79. Petafody, metamorphosis of stamens, &c, into petals. Petalvid, Petaline, petal-like; resembling or colored like petals. Petiole, a footstalk of a leaf; a leaf stalk, 49. Petiolecl. Petiolate, furnished with a petiole. Petiolulate, said of a leaflet when raised on its own partial leafstalk. Petraius, Latin for growing on rocks. Phalanx, phalanges, bundles of stamens. Phamogamous, or Phanerogamous, plants bearing flowers and producing seeds; same as Flowering Plants. Pkatnogams, Phanerogams, 10. Phlaeum, Greek name for bark, whence Endophlaium, inner bark, &c. Pl/oeniceous, deep red verging to scarlet. Phycology, the botany of Alga?. Phyllocladia, branches assuming the form and function of leaves. Phyllodium (plural, phyllodia), a leaf where the seeming blade is a dilated petiole, as in New Holland Acacias, 61. Pliyllome, foliar parts, those answering to leaves in their nature. Pkyllon (plural, phylla), Greek for leaf and leaves; used in many compound terms and names. Phyllotaxis, or Phyllotaxy, the arrangement of leaves on the stem, 67. Physiological Botany, 9. Pkytography, relates to characterizing and describing plants. Phyton, or Phytomer, a name used to designate the pieces which by their repetition make up a plant, theoretically, viz. a joint of stem with its leaf or pair of leaves. Pileus of a mushroom, 172. Piliferous, bearing a slender bristle or hair (pilum), or beset with hairs. Pilose, hairy; clothed with soft slender hairs. Pinna, a primary division with its leaflets of a bipinnate or tripinnate leaf. Pinnule, a secondary division of a bipinnate or tripinnate leaf, 66. Pinnate (leaf), when leaflets are arranged along the sides of a common petiole, 57. Pinnately lobed, cleft, parted, divided, reined, 56. Pinnatijid, Pinnatisect, same as pinnately cleft and pinnately parted, 56. Pisiform, pea-shaped. Pistil, the seed-bearing organ of the flower, 14, 80, 105. Pistillate, having a pistil, 85. Pistillidium, the body which in Mosses answers to the pistil, 159, 164. Pi tellers, 64. Pith, the cellular centre of an exogenous stem, 138. Placenta, the surface <>r part of the ovary to which the ovules are attached, 107. Placentiform, nearly same as quoit-shaped. Plaited I'm the bud), or Plicate, folded, 72, 98. Plat;/-, Greek for broad, in compounds, such as Platyphyllous, broad-leaved, &c. Pleio-, Greek for full or abounding, used in compounds, such as Pleiopetalous, of many petals, &c. Plumbeus, lead-colored. Plumose, feathery; when any slender body (such as a bristle of a pappus or a style) is beset with hairs along its side*, like the plume of a feather. Plumule, the bud or first shoot of a germinating plantlet above the cotyledons, 13. Pluri-, in composition, many or several; as Plurifoliolate, with several leaflets. Pod. specially a legume, 122; also may be applied to any sort of capsule. Podium, a footstalk or stipe, used only in Greek compounds, as (suffixed) Lepto- podus, shmder-stalked, or (prefixed) Podocephalus, with a stalked head, and in Podosperm, a seed stalk or funiculus. Pogon, Greek for beard, comes into various compounds. GLOSSARY AND INDEX. 217 Pothtle$$, destitute of any pointed tip, such as a mucro, awn, "rumination, &c. Pollen, the fertilizing powder contained in the anther, 14, ho, 103. Pollen-growth, 117. PoUen\ferous, pollen-bearing. Pollen-mast, Pollinium, the united mass of pollen, H>4, as in Milkweed and Orchis. Pollicaris, Latin for an inch long. Pollination, the application of pollen to the Btigma, 1 14. Poly-, in compound words of Greek origin, same as multi- in those of Latin origin, viz. many, as Polyadelphous, stamens united by tlieir filaments into several bundles, LOO. Polyandrous, with numerous Btamens (inserted <>n the receptacle), LOO. Polycarpic, term used by DeCandolle in the sense of perennial. Polycotf/ledonous, having many (more than two) cotyledons, as Pines, 23. Polygamous, having some perfect and some unisexual flowers, 85. Polygonal, many-angled. Polygynous, with many pi-til- or styles, 105. Polymevous, formed of many parts of each set. Polymorphous, of several or varying forms. Polypetalous, when the petals arc distinct or separate (whether few or many), 89. Polyphyllous, many-leaved; formed of several distinct pieces. Polysepalous, same as the last when applied to t lie calyx, 89. Pulyspi rmous, many-seeded. Pome, the apple, pear, and similar fleshy fruits, ll'j. Pomiferous, pome-bearing. Porrect, outstretched. Posterior side or portion of a flower (when axillary) is th;.t toward the axis, 96. Pouch, the siliele or short pod, as of Shepherd's Purse, 123. Precocious (Latin, projcox), unusually early in development. Prajloration, same as astivation, 97. Pixejbliation, same as vernation, 71. P fat morse, ending abruptly, as if bitten off. Pratensis, Latin for growing in meadows. Prickles, sharp elevations of the hark, coining off with it, as of the Rose. Prickly, bearing prickles, or sharp projections like them. Primine, the outer coat of the covering of the ovule, 110. Primordial, earliest formed; primordial leaves arc the firsl after the cotyledons. Prismatic, prism-shaped; having three or more angles bounding flat side-. Procerous, tall, or tall and slim. Process, any projection from the surface or edge of a body. Procumbi nt, trailing on the ground, 39. Procurrent, running through hut not projecting. Produced, extended or projecting; the upper sepal of a Lark-pur is produced above into a spur, 87. Proliferous (literally, bearing offspring), wh re a new branch rr-M>- from an older one. or one heel or cluster of (lowers out of another. Prupaculum or Propagulum, a shoot for propagation. Prosenchyma, a tissue of w 1-cells. Prostrate, lying flat on the ground, •'{'.». Protandrous or Proterandrous, the anthers first maturing, 116. Proteranthous, flowering before leafing. Proterogynous or Protogynous, the Btigmas firsl to mature, lit.. ProthaUium or Prothallus, 160. Protoplasm, the soft nitrogenous lining or contents, or living part, of cells, 129. Protos, Greek for first; in various compounds. Pruinose, Pruinate, frosted; covered with a powder like hoar-frost. Pseudo . Greek for false. Pseudo-bulb, the aerial conns of epiphytic Orchids I'si/ns, Greek for hare of naked, used in many compounds. Pteridophyta, Pteridophytes, 166, Pteris, Greek for wing, and general name for Kern, enter- into many compound*. 218 GLOSSARY AND INDEX. Puberulent, covered with fine and short or almost imperceptible down. Pubescent, hairy or downy, especially with fine and soft hairs or pubescence. Pulverulent or Pulveraceous, as if dusted with fine powder. Pulvinaie, cushioned, or shaped like a cushion. Pumilus, low or little. Punctate, dotted, either with minute holes or what look as such. Puncticulate. minutely punctate. Pungent, prickly-tipped. Puniceous, carmine-red. Purpureus, originally red or crimson, more used for duller or bluish-red. Pusillus, weak and small, tiny. Putamen, the stone of a drupe, or the shell of a nut, 120. Pygmceus, Latin for dwarf. Pyramidal, shaped like a pyramid. Pyrene, Pyrena, a seed-like nutlet or stone of a small drupe. Pyriform, pear-shaped. Pyxidate, furnished with a lid. Pyxis, Pyxidium, a pod opening round horizontally by a lid, 124. Quadri-, in words of Latin origin, four ; as Quadrangular, iour-angled ; Quadri- foliate, four-leaved; Quadrifid, four-cleft. Quaternate in fours. Quinate, in fives. Quinque, five. Quincuncial, in a quincunx; when the parts in aestivation are five, two of them outside, two inside, and one half out and half in. Quintuple, five-fold. Race, a marked variety which may be perpetuated from seed, 176. Raceme, a flower-cluster, with one-flowered pedicels arranged along the sides of a general peduncle, 73. Racemose, bearing racemes, or raceme-like. Rackis, see rhachis. Radial, belonging to the ray. Radiate, or Radiant, furnished with ray-flowers, 94. Radiate-veined, 52. Radical, belonging to the root, or apparently coming from the root. Radicant, rooting, taking root on or above the ground. Radicels, little roots or rootlets. Radicle, the stem part of the embryo, the lower end of which forms the root, 11, 127. Rameal, belonging to a branch. Ramose, full of branches (rami). Ramentaceous, beset with thin chaffy scales (Ramenta), as the stalks of many Ferns. Ramification, branching, 27. Ramulose, full of branchlets (ramuli). Raphe, see rhaphe. Ray, parts diverging from a centre, the marginal flowers of a head (as of Coreopsis, 94), or cluster, as of Hydrangea (78), when different from the rest, especially when ligulate and diverging (like rays or sunbeams); also the branches of an umbel, 74. Ray-flowers, 94. Receptacle, the axis or support of a flower, 81, 112; also the common axis or sup- port of a head of flowers, 73. Reclined, turned or curved downwards ; nearly recumbent. Rectinerved, with straight nerves or veins. Recurved, curved outwards or backwards. Reduplicate (in testivation), valvate with the margins turned outwards. 97. Reflexed, bent cutwards or backwards. Refracted, bent suddenly, so as to appear broken at the bend. Regular, all the parts similar in shape, 82. Reniform, kidney-shaped, b'-i. GLOSSARY AND INDEX. 219 Repamd, wavy-margined, 55. Repeal, creeping, i. ••• proetrate and rooting anderneath. Ittplum, the Frame of some pods (as of Prickly Poppy and Cross), persistent after the valves fall away. It* /limit, name as repent. Hi mpinate, inverted, or appearing as if upside down, or reversed. Reticulated, the veins forming network, 50. Retiform, in network. Retinerved, reticulate -veined. Retro [flexed, bent backwards; same 88 reflezed, Httuft, blunted; the apex not only obtuse but soin-wliat indented, 54. lit volute, rolled backwards, as the margins of many leaves, 72. Rhachis (the backbone), the axis of a spike or other body, 7^. Rkaphe, the continuation of the seed-stalk along the side of an anatropous ovule or seed, 112, 126. Rkapkides, crystals, especially needle-shaped ones, in the tissues of plants, 137. Rhizant/ious, flowering from the root. Rhizoma, Rhizome, a rootstoek, 42-44. Rhombic, in the shape of a rhomb. Rkomboidal, approaching that shape. Rib, the principal piece, or one of the principal pieces of the framework of a leaf, or any similar elevated line along a body, 49, 50. Rimose, having chinks or cracks. Ring, an elastic band on the spore-cases of Ferns, 159. Ringent, grinning: gaping open, 92. Riparious, on river-banks. Rivalis, Latin for growing along brooks; or Rivularis, in rivulets. Root, 33. Root-hairs, 35. Rootlets, small roots, or root-branches, 83. Rootstoek, root-like trunks or portions of stems on or under ground, 42. Jit i ritl its, dewy. Rosaceous, arranged like the petals of a rose. Rostellate, bearings small beak (Rottellum). Rostrate, bearing a beak {Rostrum) or a prolonged appendage. Rosulate, in a rosette or cluster of spreading leaves. Rotate, wheel-shaped, 89. Rotund, rounded or roundish in outline. Unlit r, Latin for red in general. Rubesceut, Rubicund, reddish or blushing. Rudimentary, imperfectly developed, or in an early state of development. Rufous, fin f't .r Bhorl ]»»1 of the Cretin family, I2i. SUiculose, bearing a silicle, or a fruit resembling it. 8ilique, capeule nf the Cress Family, 12 i. SMquose, bearing Biliques or poda which resemble Biliques. Silky, glossy with a coat of fine and soft, close-pressed, straight hairs. Silver-grain, the medullary raya "f wood, 139. Silvery, sinning white <>r bluish-gray, usually from a silky pubescence* Simple, of one piece; opposed to compound. Sinistrorse, turned to the left. Sinuate, with margin alternately bowed inwards and outward-, 55. Sinus, a recess or bay; the re-entering angle between two lobes or projections. 8Uep of Plants (so Jailed), 151. Smooth, properly speaking not rough, but often used for glabrous, i. e. not pu- bescent. Soboliferous, bearing shoots (Soboles) from near the ground. Solitary, single, not associated with others. Sordid, dull or dirty in hue. Sorediate, bearing patches on the surface. Sorosis, name of a multiple fruit, like a pine-apple. Sorus, a fruit-dot of Ferns, 159. Spadiceous, chestnut-colored. Also spadix-bearing. Sjxulix, a fleshy spike of flowers, 75. Span, the distance between the tip of the thumb and of little finger outstretched, six or seven inches. Spathaceous, resembling or furnished with a Spathe, a bract which inwraps an inflorescence, 75. Spatulate, or Spathulate, shaped like a spatula, 52. Species, 175. Specific Names, 179. Specimens, 18-4. Spermaphore, or Spermophore, one of the names of the placenta. Spermum, Latin form of Greek word for seed; much used in composition. Spica, Latin for spike; hence Spicate, in a spike, Spicifnrm, in shape resembling a spike. Spike, an inflorescence like a raceme, only the flowers are sessile, 74. Spikelet, a small or a secondary spike; the inflorescence of Grasses. Sjane, 41, 64. S/>indlc-shaped, tapering to each end. like a radish, 36. Spinescent, tipped by or degenerating into a thorn. 8pino*e, or Spiniferout, thorny. 8piral Vessels or ducts, 135. Spithameoue, span-high. Spora, Greek name for seed, used in compound words. S/>nra3. Spore, a body resulting from the fruetilication of Cryptogamous plants, in them the analogue of a seed. Spore-case [Sporangium), 158. Sporocarp, 1 <;•_'. 8port, a newly appeared variation, 1 7»». 8poruh , same a- a spore, or a «mall ^-pore. 8pume»cent, appearing like froth Spur, any projecting appendage of the flower, looking like n spur but hollow, as that of Larkspur, flg. 289. Sqvamate, Squamose, <>r Rquamaceoui, furnished with scales (tguama). 222 GLOSSARY AND INDEX. Squamellate, or Squamulose, furnished with little scales (Squamelfce, or Squamula). Squami/orm, shaped like a scale. Squarrose, where scales, leaves, or an}' appendages spread widely from the axis on which the}' are thickly set. Squarrulose, diminutive of squarrose ; slightly squarrose. Stachys, Greek for spike. Stalk, the stem, petiole, peduncle, &c, as the case may be. Stamen, 14, 80, 98. Staminate, furnished with stamens, 86. Stamineal, relating to the stamens. Sta minodium, an abortive stamen, or other body in place of a stamen. Standard, the upper petal of a papilionaceous corolla, 92. Starch, 136, 163. Station, the particular kind of situation in which a plant naturally occui^. Stellate, Stellular, starry or star-like; where several similar parts spread out from a common centre, like a star. Stejn, 39. Stemlet, diminutive stem. Stemiess, destitute or apparently destitute of stem Stenos, Greek for narrow ; hence Stenophyllous, narrow-leaved, &c. Sterile, barren or impertect. Stigma, the part of the pistil which receives the pollen, 14, 80, 105. Stiymatic, or Stigmatose, belonging to the stigma. Stipe (Latin Stipes), the stalk of a pistil, &c, when it has any, 112; also of a Fern, 158, and of a Mushroom, 172. Stipel, a stipule of a leaflet, as of the Bean, &c. Stipellate, furnished with stipels, as in the Bean tribe. Stipitate, furnished with a stipe. Stipulaceous, belonging to stipules. Stipulate, furnished with stipules. Stipules, the appendages one each side of the base of certain leaves, 66. Stirps (plural, stirpes), Latin for race. Stock, used for race or source. Also for any root-like base from which the herb grows up. Stole, or Stolon, a trailing or reclined and rooting shoot, 40. Stoloniferous, producing stolons. Stomate (Latin Stoma, plural Stomata), the breathing-pores of leaves, 144. Stone-fruit, 119. Storage-leaves, 62. Stramineous, straw-like, or straw-colored. Strap-shaped, long, flat, and narrow. Striate, or Striated, marked with slender longitudinal grooves or stripes. Strict, close and narrow; straight and narrow. Strigillose, Strigose, beset with stout and appressed, stiff or rigid bristles. Strobilaceous, relating to or resembling a strobile. Strobile, a multiple fruit in the form of a cone or head, 124. Strombuliform, twisted, like a spiral shell. Strophiole, same as caruncle, 126. Strophiolate , furnished with a strophiole. Struma, a wen; a swelling or protuberance of any organ. Strumose, bearing a struma. Stupose, like tow. Style, a stalk between ovary and stigma, 14, 80, 105. Styliferous, Stylose, bearing styles or conspicuous ones. Stylopodium, an epigynous disk, or an enlargement at the base of the style. Sub-, as a prefix, about, nearly, somewhat: as Subcordate. slightly cordate; Subser- rate, slightly serrate; Subaxillary, just beneath the axil, &e. Subclass, Suborder, Subtribe, 178. Suberose, corky or cork-like in texture. Subulate, awl-shaped; tapering from a broadish or thickish ba>e to a sharp point. Succise, as if cut off at lower end. Succubous, when crowded leaves are each covered by base of next above. GLOSSARY AND INDEX. 223 Suckers, shouts from subterranean branche Suffruteseent, slightly shrubby or woody al tbe base only, 39. Suffrutieose, rather more than Buffrutescent, ;;t. 39. Sulcate, grooved longitudinally with deep furrows. Superior, above, 96; sometimes equivalent to posterior, 96. Supernumerary Bud*, 30, 31. Supervohtte, plaited and convolute in hud, 97. Supine, lying flat, with face upward. Supra-axillary, home above the axil, as some buds, 31. 8upra~decompound\ many times compounded or divided. Swrculoee, producing suckers [Surculi) or shoots resembling them. 8u§pended, hangiug down. Suspended ovules or seeds hang from the very summit of the cell which contains them. Sutural, belonging or relating to a suture. Suture, the line of junction of contiguous parts grown together, 106. Sword-shaped, applied to narrow leaves, with acute parallel edges, tapering above. Syeonium, the tig-fruit, 124. Sylrestrine, growing in woods. Symmetrical Flower, similar in the number of parts of each set, 82. Sympetalous, same as gamopetalous. Sympode, Sympodium, a stem composed of a series of Buperposed hranches in such a way as to imitate a simple axis, as in Grape-vine. SynatUherOUS or Syngenesious, where stamens are united by their anthers, 1(H). Syncarpous (fruit or pistil), composed of several carpels consolidated into one. Synonym, an equivalent superseded name. Synstpalous, same as gamosepalous. System (artificial and natural), 182, 183. Systematic Botany, the study of plants after their kinds, 9. Tabescent, wasting or shrivelling. Tail, any long and slender prolongation of an organ. Taper-pointed, same as acuminate, 54. Tup-root, a root with a stout tapering body. -32-35. Tawny, dull yellowish, with a tinge of brown. Taxonomy, the part of botany which treats of classification. Tegmen, a name for the inner seed-coat. Tendril, a thread-shaped organ used for climbing, 40. Terete, long and round; same as cylindrical, only it may taper. Terminal, borne at, or belonging to, the extremity or summit. Terminology treats of technical terms; same as Glossology, 181. Temate, Ternately, in threes. Tessellate, in checker-work. Testa, the outer (and usually the harder) coat or shell of the seed, 185. Testaceous, the color of unglazed pottery. Tetra- (in words of Greek composition), four; as, Tetracoccous, of four cocci. Tetradynamous, where a flower has six stamens, two shorter than the four, 101. Tetragonal, four-angled. Tetragynous, with four pistils or styles. Tetramerous, with its parts or sets in fours. TetrandroUS, with four stamen-. LOO. Tetraspore, a quadruple -pore, 169. Thalatnqflorous, with petals ami stamens inserted on the torus or 'Thalamus. TkaUopkyta, Tkallophytes, L66. Tkallus, a stratum, in place >