226 GEOLOGICAL SURVEY OF CANADA. 



Mountain, Assiniboia; on the lower slopes in openings of the pine 

 woods in the Eocky Mountains, at Castle Mountain ; on sand in the 

 valley of Beaver Greek, Selkirk Mountains, B.C. (Mac'oun.) Kotzebue 

 Sound. {Rothr. Alask.) Moose Factory, James Bay. {Oottar & Br. 

 Say den.') Greenland. (Lange.) 



(2867.) P. Nutkaensis, Presl. 

 Alaska. ( Vasey.) 



(2868.) P. Nevadensis, Vasey. 



On cliffs along the sea at Esquimalt, and Gordon Head, near Vic- 

 toria, Vancouver Island. (Macoun.) 



(2869.) P. pratensis, Linn.; Hook., Fl. II., 246. 



This species is one of the most widely spread and most valuable 

 grasses we have in the country. It is found in almost every situation, 

 but prefers sandy or gravelly fields, where in a few years it takes com- 

 plete possession. Its value for hay is not nearly so great as for pas- 

 ture. Although often despised by the farmer it is the best friend he 

 has, us his animals feed upon it for nearly the whole summer. The form 

 generally found in the fields has been introduced, but it is indigenous 

 both in the north and west, and is destined to be the great pasture 

 grass of our If orth- west Territories. Greenland. {^Lnnge.') 



(2870.) P. purpurascens, Vasey, Bull. Torr. Bot. Club. VI., 297. 

 On the upper slopes of the Eocky and Selkirk mountains: very 

 abundant ; summit of Mount Arrowsmith, Vancouver Island, alt. 5,700 

 feet. {Macoun.') 



(2871.) P. serotina, Ehrh. ; Gray, Man. Ed. V., 629. 



P. palustris, Muhl. Gram. 150. 



P. crocata, Michx., Fl. I., 68 ; Hook., Fl. II., 246. 



Abundant in wet swampy places from the Atlantic to the Pacific. 

 Truro, and Yarmouth, If.S. (Macoun.) Baddeck, Cape Breton. QBur- 

 c/ess.) Magdalen Islands, , N.S. (McKay.) Along brooks in damp 

 fields, Bass Eiver ; Hampton, N.B. ( Fowler, Oat.) Beauport, Q . (St. 

 Oyr.) Open places, Huckleberry Eapids, Ai-genteuil Co., Q. (D' Urban.) 

 Tadousac, Q. (A. T. Drummond.) Along the Gasp^ coast, atMatane; 

 Salt Lake, Anticosti. (Macoun.) Vicinity of Ottawa. (Fletcher, It. 

 Ott.) Common in wet places at Prescott, Ont. (Billings.) Veiy 

 common throughout central Ontario, and extending northerly around 

 Lakes Huron and Superior to Eainy Lake. (Macoun.) North shore 

 of Lake Superior. (Agassiz.) Swampy ground near London. (Millman. 



