132 GEOLOGICAL SURVEY OP CANADA. 



(603.) R. nivalis, Dougl. Hook. Fl. I., 181. 



On the high snowy ridges of the Eocky Mountains. (Douglas.) This 

 is an obscure species and should be looked for about the sources of the 

 Columbia. 



161. PURSHIA, DC. ("CHAPPARAL.") 

 (604.) P. tridentata, DC. 



Tigarea tridentata, Pursh, 333. 

 Osoyoos Lake, southern boundary of British Columbia. (Dawson.) 



162. DRYAS, Linn. (DRYAS.) 



(605.) D. octopetala, Linn. 



Eocky Mountains, Lat. 52°-56°, sometimes with double flowers. 

 (Drummond.) On the top of Stuart Lake Mountain, B. C, and on 

 Mount Selwyn, Peace Eiver Pass, Lat. 56°. (Macoun.) Coast Eange, 

 near Bute Inlet, B. C, and on the Eocky Mountains, S. Kootanie Pass. 

 (Dawson.) Kotzebue Sound to Port Clarence and northern shore. 

 (JRothr. Alask.) Cape Lisburne, in Behring's Straits. (Beechey.) Shores 

 and islands of the Arctic Sea. (Franklin.) Greenland. (Hook. Arct. PL) 



Var. integrifolia, Cham. & Schlecht. 



D. integrifolia, VaM. Hook. Fl. I., 174. Macoun's Cat., No. 522. 

 D. tenella, Pursh, 350. 



Island of Anticosti. (Goldie.) Labrador. (Butler.) Churchill Eiver 

 and east coast of Hudson's Bay. (B. Bell.) In dry and rocky places 

 from Lat. 54° to the islands of the Arctic Sea, where it is abundant. 

 (Sichardson.) Extending westward to Behring's Straits. (Chamisso.) 

 Eocky Mountains, Lat. 52°-56°, especially on the more elevated ridges. 

 (Drummond.) Top of Mount Selwyn, Peace Eiver Pass. (Macoun.) 



(606.) D. Drummondii, Hook. 



On gi-avelly beaches and bars of rivers. Dartmouth, and Ste. Anne 

 des Monts, Elvers, Gasp^, Q. Gravel bars in the Bow Eiver at and 

 above Morley ; Peace Eiver, within the Eocky Mountains, and west to 

 the Blackwater Eiver, B.C. (Macoun.) Island of Anticosti. (Pursh.) 

 Slate Islands, Lake Superior. (Prof. Ellis.) In the woody country, 

 Lat. 54*^-64°, and about Slave and Bear Lakes, as far as the mouth of 

 Bear Lake Eiver, and thence to the shores of the Arctic Sea. (Bichard- 

 son.) Gravelly battures of alpine rivers, Lat. 52°-56°. (Drummond.) 

 Eocky Mountains, Kootanie Pass. (Dawson.) 



