12 MISC. PUB; 832) U.S.) DEPT OFF AGRICULLORE 
BN—13206 
FicurE 4.—Thistleroot (Argemone mexicana L.) 
DistrIBuTION AND Haprrar.—Thistleroot grows throughout the Vir- 
gin Islands. It thrives in full sun in the drier regions and also where 
rainfall is moderate. The plants occur in patches along streams and 
roadsides, around the edges of thickets, in open pastures, and fre- 
quently in abundant stands in freshly cultivated fields. This weed 
