206 GEOLOGICAL SURVEY OF CANADA. 



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

 Eocky and Selkirk mountains, and in northern British Columbia. 

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

 rivers, lat. 62° 41', N.W.T. {Dawson.) Kotzebue Sound. {Rothr. 

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

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

 Pacific coast. {Hooker, Fl.) Eed Eiver, Man., 1827. {Douglas.) 



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



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

 the species. Eather common at Donald in the Columbia Valley, 1885. 

 {Macoun.) 



Var. brevifolia, Vasey. (MS.) N. Var. 



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.) 



Var. robusta, Vasey. (MS.) N. Var. 



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, Vasey, Cat. Grasses, U. S. 51, (1885.) 



Calamagrostis Pickeringii, Gray, Man. Ed. V., 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, Vasey, Cat. Grasses, U. S. 51, (1885.) 

 Calamagrostis Porteri, Gray, Man. Ed. V., 615. 

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

 of the mountains at the entrance to Bow Eiver Pass, in the Eocky 

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

 of the species. {Macoun.) 



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

 (1885.) 



Calamagrostis purpurascens, E. Br. ; Hook., Fl. 11., 240. 

 Arctic sea-shore. {Hooker, FL) Fort Yukon. {Bothr. Alask.) 

 Greenland. {Lange.) Dr. Vasey, writes me that Torrey thought this 

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

 a very poor character. 



