335] FLORA OF COLUMBIA AND VICINITY I93, 



731. A. hypericifolium Ait. 

 Fields and roadsides; scarce. 



Ontario to British Columbia; Ohio to New Mexico- 



732. A. cannabmum L. Indian hemp. 

 Common in fields; thickets and waste places. 

 Anticosti to British Columbia ; Florida to Lower 



California. 



733. A. album Greene [A. ca7inabimim glaberritmtm DC.]. 

 River Indian hemp. 



Along streams and in low grounds. 



Maine and Ontario to Wisconsin; Virginia to Missouri. 



Family 88. ASCLEPIADACEAE Lindl. Milkweed family. 



307. GOMPHOCARPUS L. \^ACERArESY.\\7[. 

 Green milkweed. 



734. G. longifolius (Ell.) K. Sch. {A. longifolia Ell.: A. 

 Floridana (Lam.) Hitchc.]. 



Wild fields and along railroads; local, but becoming year- 

 ly more frequent. 

 Ohio and Ontario to Minnesota; Florida to Texas. 



308. ASOLEPIAS L. Milkweed. 



735. A. tuberosa L. Butterfly weed. 



Dry fields and roadsides; less common than the next. 

 Maine to Ontario and Minnesota and Colorado; 

 Florida to Arizona. 



736. A. decumbens L. \^A. tuberosa deaimbeus (L.) 

 Pursh]. Pleurisy root. 



Common with the above, into which it merges in numer- 

 ous forms. 



New York to Illinois; North Carolina and Florida to 

 Missouri. 



737. A. purpurascens L. Purple milkweed. 

 Fields and open thickets; infrequent. 

 Massachusetts to Minnesota ; North Carolina to 



Tennessee and Kansas. 



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