PREFACE. V 



my own drawings and photographs ; but for most of the wood-cuts I 

 am indebted to Baillon (Histoire des Plantes), Figuier (Histoire des 

 Plantes\ and Woodville (Medical Botany). Those of Clematis Vir- 

 giniana and Anemone patens, var. Nuttalliana, were kindly placed 

 at my disposal by Professor J. U. and Mr. C. G. Lloyd (Drugs and 

 Medicines of North America, now in course of publication). 



To my friend Dr. N. L. Britton, of Columbia College, I am much 

 indebted for valuable suggestions, and for affording me every assist- 

 ance required in consulting the extensive herbarium of that institution ; 

 and to my friends Dr. Thomas F. Wood, Wilmington, N. C., and Dr. 

 H. H. Rusby, Detroit, Mich., I extend my thanks for recent specimens 



required to illustrate the work. 



L. J. 



323 WEST S?TH ST., NEW YORK. 

 December, 1884. 



