Butters: pi.ant distribution in the sei-kirk mountains 327 



Dryas Uruninioiulii Richards. Mouth of Carncs creek ; Glacier ; Rockies, 



very abundant. 

 Dryas octopetala L. "Small peak ;" Rockies, abundant. 

 Epilobium Hornemannii Reichenb. Cougar valley; Bear creek; Prairie Hills; 



Rockies (?). 

 Equisetum arvense L. Beavermouth ; Howser lake; "alpine meadow 118° 20' 



W. Long., 51° 45' N. Lat.i ;" Rockies, abundant. 

 Equisetum variegatum Schleich. Fish creek valley ; flats of Gold river^ ; flats 



of the Columbia, Revelstoke; Rockies, common. 

 Moneses uniflora (L.) Gray. Hov^rser lake; Rockies, common. According to 



Brown and Schafifer "in mossy spots throughout the region," i. e., Rockies 



and Selkirks ; it is certainly more common in the former range. 

 Parnassia fimbriata Konig. Widespread in the Selkirks but local ; Rockies 



more abundant. 

 Poa alpina L. Avalanche mt, Glacier ; flats of Gold river ; Prairie Hills ; 



Rockies, common. 

 Populus trichocarpa Torn and Gray. Common throughout Selkirks and 



Rockies. 

 Salix arctica Pall. Not recorded elsewhere in the Selkirks ; Rockies, abundant. 

 Salix Barclayi Anders. "Alpine meadow;" Rogers Pass; Cougar valley (?) ; 



Rockies ( ?). 

 Salix nivalis Hook. Fish creek valley; Cougar valley; "small peak;" Rockies, 



abundant. 

 Salix vestita Pursh. Only recorded Selkirk station ; Rockies, abundant. 

 Saxifraga aizoides L. Fish creek valley ; Dawson moraine ; Downie creek 



valley; Rockies, abundant. 

 Silene acaulis L. Hermit range; "small peak;" Mt. MacDonald ; Rockies, 



abundant. 

 Solidago multiradiata Ait. var. scopulorum Gray. Snowsheds, Glacier; Asulkan 



pass; Prairie Hills; "small peak;" Rockies, abundant.-^ ' , 



1 Another ■ location where C. H. Shaw collected extensively; it is apparently close to 

 the "small peak;" it will be noted hereafter as "alpine meadow." 



2 Gold river, and its branch. Palmer creek, drain the Sir Sandford range. 



'■i In contrast to the above list, the distribution is here given of a few of the character- 

 istic plants of the north moraine: 



Cassiope mertensiana (Bong.) G. Don., Phyllodoce empetriformis (Smith) D. Don., 

 and Ph. glandiflorus (Hook.) Coville. Very abundant throughout the Selkirks, abu.ndant 

 in alpine regions in the Rockies which are not excessively calcareous, occasionally found 

 in calcareous areas, but never abundant nor reaching a large size. 



There are extensive beds of shale, sandstone, schist, and quartzite in the Rockies, 

 interbedded with the limestones. There are therefore considerable upland areas fairly free 

 from the latter rock. In the lower altitudes the soil almost always contains a considerable 

 proportion of limestone debris. 



Gaultheria humifusa (Graham) Rydb. Avalanche Crest, Glacier; Azimuth mt. ; Rockies, 

 Yoho valley, soil not calcareous, the only specimen seen from that range. Brown and 

 Schaffer give, "Common in alpine meadows throughout the Rockies and Selkirks;" it is 

 certainly rather uncommon in the former range, and scarcely common in the latter. 



Lutkea pectinata (Pursh) Kuntze. The most characteristic Selkirk plant at high alti- 

 tudes, occurring everywhere except in limestone areas; Rockies, not recorded. 



Oxyria digjna (L.) Hill. The distribution of this plant is peculiar. It is the most 

 abundant plant in parts of the north' moraine, a single specimen was found on the south 

 moraine, growing under a peculiar brown boulder. It is widely distributed in both Sel- 

 kirks and Rockies, but very local, sometimes growing in undoubtedly calcareous soil. It 

 grows very abundantly and luxuriantly in an area close to the limestone ledges of Downie 

 creek. Unfortunately no specimens of the soil were taken. Its distribution suggests that 

 it is dependent on the presence of some soil constituent other than lime. 



Sibbaldia procumbens L. Local throughout Rockies and Selkirks. 



