l8o UNIVERSITY OF MISSOURI STUDIES [3^2 



660. V. Raflnesquii Greene. [V. te^iella Muhl.: V. tricolor 

 arvensis Hook.]. Field pansy. 



Very common in wild open places, especially about rivu- 

 lets with low rocky shores. 

 Maine to Michigan; Georgia to Texas. 



661. V. striata Ait. Pale violet. 



Moist thickets about streams; becoming very scarce. 

 New England and Ontario to Minnesota; Georgia to 

 Missouri. 



662. V. pubescens Ait. Hairy yellow violet. 

 Oak woods; scarce and seldom typical. 



Quebec to South Dakota; South Carolina to Tennessee 

 and Missouri. 



663. V. scabriuscula (T. & G.) Schwein. [F. pubesce7is 

 scabriuscula T. & G.]. Smooth yellow violet. 



Common along streams and in low woods: forms con- 

 necting this with the preceding are not rare on the higher 

 grounds. 



Nova Scotia to Manitoba; South Carolina to Tennessee 

 and Missouri. 



Family 74. LOASACEAE Reichenb. Loasa family. 



259. MENTZELIA L. 



664. M. oligosperma Nutt. 



Common on the bluffs and banks of the Missouri. 

 Illinois to South Dakota and Colorado; Louisiana to 

 Texas and Mexico. 



Order 28. OPUNTIALES. 

 Family 75. CACTACEAE Lindl. Cactus family. 



260. OPUNTIA Mill. Prickly pear. 



665. O. Raflnesquii Engelm. \0. humifusa Raf.]. West- 

 ern prickly pear. 



Barren hillside between Hinkson and Grindstone creeks. 

 Michigan to South Dakota; Missouri to Kansas and 

 Texas. 



