UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 800 



Joint Contribution from the Burean 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 



Heactiption ot Aaclepifia galiotdea 5 



Experimental Work 8 



Chemical E!xamination 20 



General Discussion and Conclusions 25 



Summary * 39 



.WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1920 



