In rich woods in the Minnesota and Sioux valleys, and 

 in the Black Hills. 



Viola Canadensis, L. Canadian Violet. 



Abundant in rich woods in the Minnesota and Sioux 

 valleys, and in the Black Hills. 



Viola areiiaria, Dc. Sand Violet. 



In dry soils in the Black Hills, near Rapid City. 



Viola caiiina adimca, Gray. 

 In the Black Hills. 



LoASACE^. — Loasa Family. 



Mentzelia olig-osi>eriua, Nutt. Few-seeded Mentzelia. 



Occasional in the Black Hills; more common in the 

 adjacent plains. 



Mentzelia niida, (Pursh.) T. & G. Bractless Mentzelia. 

 A rare plant, reported only for the Black Hills. 



Mentzelia decapetala, (Pursh.) Urban & Gilg. Showy 

 Mentzelia. 

 Mentzelia ornata^ T. & G. 



Common in dry soils from the Missouri westward. 



Cactace^. — Cactus Family. 



Opuntia liiiinifiisa, Raf. Western Prickly Pear. 

 Opuntia Rafinesqun, Engelm. 

 In the Black Hills and the adjacent plains region. 



Opnntia frag'ilis, (Nutt.) Haw. Brittle Opuntia. 

 In the Black Hills; rare. 



Cactus Missoviriensis, (Sweet.) Kuntze. Missouri Cactus. 

 Maniillaria Missouriensis^ Sweet. 



On bluffs, knolls and plains from the Missouri river 

 westward. 



Cactus viviparus, Nutt. Purple Cactus. 

 Mamillaria vivipara^ Haw. 



From the Missouri valley westward. 



