226 GEOLOGICAL SURVEr OP 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 Creek, Selkirk Mountains, B.C. {Macoun.) Kotzebue 

 Sound. (Rothr. Alask.) Moose Factory, James Bay. {Cottar & Dr. 

 Hayden.') Greenland. (Lange.) 



(2867.) P. Nutkaensis, Presl. 

 Alaska. ( Vasey.) 



(2S68.) P. Nevadensis, Vasey. 



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

 toria, Vancouver Island. (Macoun.) 



(2869.) P. pratensis, Linn. ; Hook., Fl. 11., 246. 



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

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

 but prefers sandy or gravelly ticlds, where in a few yeai's 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 iced 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 bo the great pasture 

 gi-ass of oui- Xorth-wesl Territories. Greenland. (^Lange.) 



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

 On the uj)per slopes of the Eock}- 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. palustns, 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, X.S. {Macoun.) Baddeck, Cape Breton. {Bur- 

 gess.) Magdalen Islands, N.S. {McKay.) Along brooks in damp 

 fields, Bass Eiver ; Hampton, N.B. {Fowler, Cat.) Beauport, Q. {St. 

 €yr.) Open places. Huckleberry Eapids, Argenteuil Co., Q. {D' Urban.) 

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

 Salt Lake, Anticosti. {Macoun.) Vicinity of Ottawa. {Fletcher, 11. 

 Ott.) Common in wet places at Prescott, Ont. {Billings.) Very 

 common thi-oughout central Ontario, and extending northerly around 

 Lakes Huron and Superior to Eainj- Lake. {Macoun.) North shore 

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



