Butters: plant distribution in the Selkirk mountains 329 



Mitella Brevveri Gray. Widely distributed but somewliat local in the Sel- 

 kirks ; Rockies, abundant. 



Mitella pentandra Hook. Distribution similar to M. Breweri. 



Mitella trifida Graham var. violacea (Rydb.) Rosendahl. Very rare; the 

 only other specimens of this species from this region are from Carbonate 

 Draw (upper Columbia valley) and Lake Louise (Rockies). The latter is 

 the typical species. 



Poa glauca Vahl. Avalanche mt., Glacier ; Rockies, no specimens. 



Ranunculus Eschscholtzii Schlect. Widely distributed in the Selkirk range, 

 but local ; Rockies, very abundant. 



Ribes lacustre (Pers.) Poir. Widely distributed in the Selkirks; Rockies, 

 very abundant. 



Salix nivalis Hook. 



Salix sp., shrub 1 m. tall, possibly S. Barclayi. Unfortunately the specimens 

 have been mislaid. 



Saxifraga nivalis L. "Small peak ;" Rockies, very abundant. 



Sedum stenopetalum Pursh. Bishop's range; Rockies, fairly common. 



Selaginella densa Rydb. Avalanche Crest, Glacier; mountain above Revel- 

 stoke ; "small peak ;" Rockies, very abundant at high altitudes. 



Thalictrum occidentale Gray. Avalanche Crest, Glacier ; "alpine meadow ;" 

 "frequent throughout the Rockies" according to Brown and Schaffer. 



Vaccinium membranaceum Dougl. A few small plants on these ledges; Sel- 

 kirks, very abundant throughout; Rockies, rare. 



Valeriana sitchensis Bong. Frequent throughout the Selkirks ; Rockies, less 

 abundant. 

 I have a record of a single small hemlock tree, Tsiiga hetero- 



phylla (Raf.) Sarg., growing on these ledges. The two hemlocks, 



Ts. heterophylla, and Ts. mertensiana (Bong.) Carr. are very scarce 



and stunted in the calcareous parts of this valley, in marked con- 

 trast to their large size and abundance in neighboring valleys, and 



throughout the Selkirk range generally. They are not recorded 



from the Rockies. 



3. The Flora of the Limestone Hedges near the Head of 

 THE Valley of Downie Creek 



A short distance north of the pass between the head of the 

 North Fork of the Illecillewaet river and the head of Downie creek, 

 there are extensive cliffs of a dark gray, massive limestone. This 

 region is about midway in latitude between the two previously dis- 

 cussed and lies farther west than either of the others, although like 

 the Cougar valley it is just west of the Selkirk divide. Several 

 plants, otherwise rare or unknown in the Selkirk range, were found 

 upon these ledges or among the adjacent debris. 



