CATALOGUE OP CANADIAN PLANTS. 139 



spots where water gathers in the spring, and near the margins of the 

 larger pools and depressions in the prairie. The commonest form of 

 the species. (Macoun.) 



(636.) P. pilosa, Willd. 



On bank of the Canada Southern Eailway, a little above the Clifton 

 House, Niagara Falls. A fine clump of this species was found growing 

 here in great luxuriance in July, 1882. Its tall rigid stems and light 

 yellow flowers distinguish it from P. gracilis, its near ally. This species 

 evidently came from southern Europe. 



(637.) P. argentea, Linn. Silvery Cinque-foil. 



Introduced into dry fields and pastures. In some localities probably 

 indigenous. Halifax, Truro, Margaretville, and Kentville, N.S. (Mc- 

 Kay.) Norton, N.B. (Fowler's Cat.) Eiviere du Loup, Q. (Thomas.) 

 Vicinity of Ottawa. (Fletcher Fl. Ott.) Field, back of the Drill Shed, 

 Kingston, Ont. ; sandy fields, Picton, Ont ; near Colborne, Ont., in a 

 field ; and abundant on vacant lots near St. James' Cemetery, Toronto. 

 (Macoun.) Dry fields near London, Ont. (Burgess.) 



(638.) P. hum if usa, Nutt. 



P. condnna, Richards. Hook. Fl. I., 193. Macoun's Cat., No. 555. 



Plains of the Saskatchewan about Carl ton. (Drummond.) On, the 

 tops of gravel knolls or hills throughout the prairie region, but rare. 



(Macoun.) 



(639.) P. nivea, Linn. Hook. Fl. I., 195. 



Labrador. (Hooker.) Churchill Eiver. (R. Bell.) Dry and ele- 

 vated ridges of the Eocky Mountains, Lat. 52-56. (Drummond.) 

 Mackenzie Eiyer. (McGill Coll. Herb.} Shores of the Arctic Sea. 

 (Richardson.) Islands of the Arctic Sea. (Parry.) Kotzebue Sound, 

 and coast west of Cape Bathurst. (Rothr. AlasL) Greenland. (Hook. 

 Arct. PL) 



Var. Vahliana, Seem. 



P. Vahliana, Hook. Fl. I., 194. 



P. nivea, var. y, Torr. & Gray, Fl. I., 441. 



Alpine prairies of the Eocky Mountains. (Drummond.) Shores of 

 the Arctic Sea. (Richardson.) Islands of the Arctic Ocean. (Parry.) 

 Greenland. (Hook. Arct. PL) 



Var. dissecta, Watson. 



Eocky Mountains at the head of Smoky River. ( Watson.) This is 

 a very variable species. 



