PREFACE. 



In connection with the work of Drug-Plant Investigations many 

 inquiries are received from various parts of the country asking for a 

 list of the drug-producing plants of the regions concerned and for 

 information as to the parts of the plants used in medicine, etc. It 

 being impossible to comply with requests of this nature in any satis- 

 factory way. Miss Henkel was asked to compile a list of the drug 

 plants of this country, using as a basis the catalogues of dealers in 



crude drugs and the standard works on systematic botany. It has 

 seemed from an inspection of these lists and of much current phar- 

 maceutical literature that the recent changes in botanical nomenclature 

 have succeeded one another too rapidly to permit the drug dealer and 

 the pharmacist to keep pace with them. This has resulted in consider- 

 able confusion in regard to botanical names, and in some oases in the 

 matter of the common names of drug-producing plants. In such a 

 list as that herewith presented the opportunity for helping to clear up 



this situation has seemed worth improving. The recent appearance 



of the new Pharmacopoeia, in which the botanical nomenclature ha^ 

 been revised, has seemed to emphasize the desirability of making thi^ 

 attempt, since the names in the case of official plants will be fairly 

 definitely fixed among pharmacists for the next ten years. In the 

 accompanying list the pharmacopceial names are given and a revision 



of the nomenclature of the unofficial drugs is also presented. Mr. 



Frederick V. Coville, Botanist, has kindly revised the botanical name- 

 used in this publication. 



It is hoped that this compilation will tend to unify usage anion; 

 those who have to do with crude drugs and drug plants. 



Rodney H. True, 



Physiologist in Chary*' 



Office of Dure '-Plant Investigations, 



Washington, D. t\, October 1% 1906. 



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