In rich woods in the Minnesota and Sioux valleys, and 

 in the Black Hills. 



Viola Caiiadeiisis, L. Canadian Violet. 



Abundant in rich woods in the Minnesota and Sioux 

 valleys, and in the Black Hills. 



Viola arenaria, DC. Sand Violet. 



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



Viola cauiua aduiica, Gray. 

 In the Black Hills. 



LOASACE^;. Loasa Family. 



Meiitzelia oligosperma, Nutt. Few-seeded Mentzelia. 



Occasional in the Black Hills; more common in the 

 adjacent plains. 



Meiitzelia nuda, (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. 



Opvintia humifusa, Raf. Western Prickly Pear. 

 Opuntia Raftnesquii, Engelm. 

 In the Black Hills and the adjacent plains region. 



Opvmtia fragilis, (Nutt.) Haw. Brittle Opuntia. 

 In the Black Hills; rare. 



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

 Mamillaria 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. 



