138 GEOLOGICAL SURVEY OP CANADA. 



On limestone rocks near Stuai-t Lake, and at Cache Ci-eek, B.C. 

 (Macoun.) 



(632.) P. effusa, Dougl. 



On elevated grounds of the Assiniboine, and the higher parts of the 

 Eed Eiver, plentiful. {Douglas.) Very common on the Souris Plain, 

 but seems to merge into the preceding species farther to the west. 

 {Macoun.) 



(633.) P. Plattensis, Nutt. 



P. sericea, var. ,i, PI. Bourgeau, 256. 



Very common from Cut Ai-m Creek, N.W.T., westward, and south- 

 ward towards the 49th parallel on saline, marshy soils. (Macoun.) 

 Saskatchewan Plains. {Bourgeau.) 



(634.) P. dissecta, Pursh. Hook. PI. I., 193. 



P. diversifolia, Hook. Fl. I., 190. Macoun's Cat, No. 548. 

 P. Drummondii, Hook. Fl. I., 189. Macoun's Cat, No. 556. 

 P. ruhricavlU, Hook. Fl. I., 191. 



York Factory and Echimamish Eiver. {R. Bell.) Near Hudson's 

 Bay. {Pursh.) About Bear Lake, in Lat. 66°. {Richardson.) Alpine 

 woods and prairies in the Eocky Mountains, as well as on the higher 

 summits, Lat. 52°-56°. {Drummond.) Eocky Mountains in the S. 

 Kootanie Pass, and on the Coast Eange, B.C. {Dawson.) Great Slave 

 Lake. {McGill Coll. Serb.) 



(635.) P. gracflis, Dougl. Hook. Fl. I., 192. 

 P. nirea, var. PI. Bourgeau, 256. 



Common throughout the western prau'ies and extending into British 

 Columbia. 



Var. flabelliformis, Ton. & Gray. 



P. flabelliformis, Hook. Fl. I., 192. Macoun's Cat, 549. 



Plains of the Saskatchewan. {Drummond..) Abundant on the 

 western prairies. {Macoun.) 



Var. fastigiata, "Watson. 



P. fastigiata, Nutt Torr. & Gray, Fl. I, 440. 



Old Wives Lakes, N.W.T., and westward, rare. {Macoun.) 



Var. rigida, "Watson. 



P. chrysaniha, Hook. Fl. I., 193. 



P. rigida, Nutt Torr. & Gray, Fl. 1, 440. 



P. Nuttallii, Lehm. Macoun's Cat, No. 554. 



Moist praii-ies near the Eocky Mountains. {Drummond.) In low 



