S*^ M ^irie Tt Digitized by the Internet Archive in 2007 with funding from IVIicrosoft Corporation http://www.archive.org/details/bacteriologyofdiOOnuttrich ^ PLATE I. >^r^ I...I()l.nson,ncl. PODOPHYLLUM PELTATUM, Plate \ .—{Frontispiece.) Podophyllum peltatum. Fig. 1, — Flowering stem and rhizome, natural size. Fig. 2. — Pistil and stamen, natural size. Fig. 3. — Fruit, half grown. :?'-fe?^ ■::/ih-^ }.>f ^"^' DtLCanLBKhk MANUAL OP THE MEDICAL Botany of North America LAURENCE JOHNSON, A.M., M.D., • liECTTUEER ON MEDICAL BOTANY, MEDICAL DEPARTMENT OP THE UNIVERSITY OF THE CITY OF IWW YORK : FELLOW OF THE NEW YORK ACADEMY OF MEDICINE, AND OF THE NEW YORK ACAD- EMY or SCIENCES : member of the COMMITTEE OP REVISION OF THE PHARMACOPCEIA OF THE UNITED STATES, MEMBER OF THE TOBREY BOTANICAL CLUB, ETC. NEW YORK WILLIAM WOOD & COMPANY 56 & 58 Lafayette Place 1SS4 COPTKIOHT, 1884, Bt WILLIAM WOOD & COMPAl^ mmriNQ and bookbinding company, NEW YORK. PREFACE For many years medical botany has had no place in most Ameri- can medical schools ; and no text-book on the subject has issued from the American press during a generation. As a result of this neglect, I believe that vegetable materia medica is taught at a great disadvantage, and often imperfectly. Plants bear relations to each other no less definite than those of the chemical com- pounds of inorganic substances ; and a knowledge of these relations should, in my opinion, precede all attempts at classification of plants as therapeutic agents. Furthermore, much of the credulity evinced regarding so-called new remedies of vegetable origin is directly traceable to ignorance of plants in general, and of their relations to each other. Let the most extravagant assertions be made concerning the therapeutic activity of any hitherto unused plant — or of one used and long-forgotten — and ex- perimenters immediately busy themselves with it, no matter if other closely allied species are known to be inert. And yet, the different species of a genus are so closely related that when one is demonstrably useless, as a rule, we need not expect much from the others. As a teacher of medical botany I have been much embarrassed by the want of a text-book suited to the needs of American students — one combining a brief sketch of general botany with descriptions of medi- cinal plants — and, in this volume, have endeavored to supply that want. In the first part, or Elements of Botany, I have sketched the life- history of plants from germination to reproduction, explaining the technical terms commonly employed in botanical descriptions and the plan of classification in general use at the present day. IV PREFACE. In the second part, or Medicinal Plants of North America, I have presented a systematic arrangement and description of most of the medicinal species, both indigenous and naturalized, which grow upon this continent. I have not, however, endeavored to make the list complete, but rather to exercise a judicious discrimination in selecting the most important. Yery many species have been noticed merely to condemn them ; still these often serve a useful purpose as examples of orders or genera. Under the title, Character of the Order ^ are given the prominent and cliaracteristic features of the order as a whole ; and under the title, Character of the Genus^ the distinguishing characteristics of the genus. In case only a single species of a genus is described, the char- acter of the latter is omitted. Following the Descrvption of a species are its Habitat^ or place of growth, the Part used medicinally. Constituents^ Prejpa'rations, and a brief account of its Medical Frojperties and Uses. The words, United States Pharmacojyoeia, following the names of parts used, or of preparations, signify that such parts or preparations are official ; and official, throughout the work, signifies directed by the Pharmacopoeia, the only recognized authority. Everywhere brevity and conciseness have been aimed at, but no- where more than in the notes upon the medical properties and uses. Here I have paid little attention to traditions, except when I could trace them to a substantial foundation, believing that, in such matters, a judicious scepticism is wiser than blind credulity. In general, I have summarized the opinions of authors whom I consider most reliable, and have also drawn freely from the records of my own experience and observation. In the botanical part of the volume, I have followed no author ex- clusively. Among those whose works I have most frequently con- sulted are Baillon, Barton, Bentham, Bentley and Trimen, Bigelow^ Chapman, Figuier, Gray, Griffith, Lindley, Michaux, Porcher, Pursh, liafinesque, Torrey and Gray, and WoodviUe. I scarcely need add that I have had constant access to specimens, both recent and dried ; the latter either in my own herbarium or in that of Columbia College. The colored plates and a few of the illustrations on wood are from PREFACE. V my own drawings and photographs ; but for most of the wood-cuts I am indebted to Baillon {Histoire des Pl