373] FI.ORA OF COLUMBIA AND VICINITY 33 I 



402. POLYMNIA L. Leaf-cup. 



972. P. Canadensis L. Small-flowered leaf-cup. 

 Banks of Hinkson creek, southwest. 



Ontario and Michigan to Minnesota; Georgia to Mis- 

 souri. 



973. P. Uvedalia L. Yellow leaf-cup. 

 Rich woods near Rocheport cave. 



New York, to Michigan and Missouri; Florida to Texas. 



403. SILPHIUM L. Rosinweed. 



974. S. perfoliatum L. Cup-plant. 



Common on the banks of streams and in low grounds. 

 Ontario to Minnesota and South Dakota; Georgia to 

 Louisiana: naturalized eastward. 



975. S. integrifolium Michx. Rosinweed. 

 Common in thickets and on wooded hillsides. 



Ohio and AIichigan to Minnesota and Nebraska; Mis- 

 sissippi to Texas. 



976. S. terebinthinaceum Jacq. Prairie dock. 

 Rare on barren bluffs of Grindstone creek. 



Ontario and Michigan to Minnesota; Georgia to Louis- 

 iana. 



977. S. laciniatum L. Compass plant. 

 Very rare along the Providence road. 



Ohio and Michig.\n to South Dakota; Alabama to Texas. 



404. PARTHENIUM L. Feverfew. 



978. P. integrifolium L. American feverfew. 

 Common on bluffs and in dry thickets. 

 Maryland to Minnesota; Georgia to Texas. 



405. AMBROSIA L. Ragweed. 



979. A. bidentata L. Prairie ragweed. 

 Common along roadsides and in dry fields. 



Illinois to Missouri; Louisi.^na to Texas and Mexico. 



