172 



Elatinace^. — Waterwort Family. 



Ehitiiie triandra, Schk. Long-stemmed Waterwort. 



In mud on margins of ponds and rivers in the Minne- 

 sota valley; in the Missouri valley in Walworth county^ 

 and in White river in the plains region. 



CiSTACE^. — Rock Rose Family. 



Heliaiitheniuiu iiia.jiis, (L.) B. S. P. Hoary Frostweed. 

 On roadsides east of Custer in the Black Hills. 



ViOLACE^. — Violet Family. 



Viola petlatifida, Don. Prairie Violet. 



On prairies in the Minnesota, Sioux and James valleys, 

 and in the Black Hills. 



Viola ol)liqua, Hill. Meadow Violet. 

 Viola ciiciillata^ Ait. 



Mostly along streams or in the shady places from the 

 Missouri river eastward, and in the Black Hills. 



Viola pedata, L. Bird's-foot Violet. 



On prairies in the Minnesota valley near Bigstone Lake. 



Viola paliistrls, L. Marsh Violet. 



In moist soil near Sylvan Lake in the Black Hills. 



Viola blanda, Willd. Sweet White Violet. 

 In damp ground in the Black Hills. 



Viola Nvittallii, Pursh. Nuttall's Violet. 



On prairies from the James valley westward through- 

 out the state. 



Viola pubesceiis, Ait. Hairy Yellow Violet. 



In rich woods in Union county in the Sioux valley,^ 

 and in the Black Hills. Most of the specimens referred 

 to this species belong to the next. 



Viola scabriuscula, (T. & G.) Schwein. Smoothish Yel- 

 low Violet. 

 Viola pubescens scabriiisciila^ T. & G. 



