206 GEOLOGICAL SURVEY OF CANADA. 



the Peace River ; common along slopes and by ponds through the 

 Rocky and Selkirk mountains, and in northern British Columbia. 

 (Macoun.) Pelly Banks, lat. 62 ; and confluence of Lewes and Pelly 

 rivers, lat. 62 47', N.W.T. (Dawson.) Kotzebue Sound. (Eothr. 

 Alask.) Quebec ; Saskatchewan and English rivers, through the wooded 

 country to the Rocky Mountains ; Nootka, and Observatory Inlet, 

 Pacific coast. (Hooker, Fl.) Red River, Man., 1827. (Douglas.') 



Yar. Americanum, Vasey. (MS.) N. Yar. 



This is a very beautiful form, stouter and much lighter colored than 

 the species. Rather common at Donald in the Columbia Yalley, 1885. 

 (Macoun.) 



Yar. brevifolia, Yasey. (MS.) N. Yar. 



This variety, as its name indicates, has short involute leaves and a 

 narrow panicle. It is a little over a foot in height and may be only a 

 depauperate form of the species. (Macoun.) Pelly Banks, lat. 62, 

 N.W.T., 1887. (Dawson.) Damp slopes, near McLeod's Lake, lat. 

 55, B.C. (Macoun.) 



Yar. robusta, Yasey. (MS.) N. Yar. 



A very tall and stout variety growing in water or along the borders 

 of marshes throughout Manitoba and the Saskatchewan region ; Hand 

 Hills, Alberta. (Macoun.) Souris Plain, Man. (J. M. Macoun.) 



(2789.) D. Pickeringii, Yasey, Cat. Grasses, U. S. 51, (1885.) 



Calamagrostis Pickeringii, Gray, Man. Ed. Y, 616 ; Macoun, Cat. No, 2142. 

 The only known station for this species in Canada is in the wet mea- 

 dows surrounding Louisburg, Cape Breton, 1883. (Macoun & Burgess.) 



(2790.) D. Porteri, Yasey, Cat. Grasses, U. S. 51, (1885.) 



Calamagrostis Porteri, Gray, Man. Ed. Y, 615- 



Specimens referred here by Dr. Yasey were collected on the slopes 

 of the mountains at the entrance to Bow River Pass, in the Rocky 

 Mountains, 1879. Better specimens are needed to settle the identity 

 of the species. ( Macoun.} 



(2791.) D. purpurascens, Kunth; Yasey, Cat. Grasses U.S. 51, 

 (1885.) 



Calamagrostis purpurascens, R. Br. ; Hook., Fl. II., 240. 

 Arctic sea-shore. (Hooker, Fl.) Fort Yukon. (Eothr. Alask.) 

 Greenland. (Lange.) Dr. Yasey, writes me that Tor rey thought this 

 was JD. sylvatica. I am of the same opinion, as the purple glumes are 

 a very poor character. 



