5SES32S 
UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 800 
Joint Contribution from the Bureau of Animal Industry, JOHN R. MOHLER, Chief 
and the Bureau of Plant Industry, WM. A. TAYLOR, Chief 
Washington, D. C. 
PROFESSIONAL PAPER 
June 8, 1920 
THE WHORLED MILKWEED (Asclepias galioides) 
AS A POISONOUS PLANT 
By 
C. DWIGHT MARSH and A. B. CLAWSON, Physiologists, 
J, F. COUCH, Pharmacological Chemist, Bureau of Animal 
Industry, and W. W. EGGLESTON, Assistant Botanist, 
Bureau of Plant Industry 
CONTENTS 
Page 
Historical Summary . 1 
Description of Asclepias galioides 5 
Experimental Work ...._".< 8 
Chemical Examination 20 
General Discussion and Conclusions 25 
Summary * 39 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
