19^6] Plants from the Canadian Rockies and Selkirks. 109 



Arnica Louiseana, sp. nov. 



Plant 7-20 cm. high, slender, pubescent. Leaves in about 

 three pairs, the two lowest at base of stem, the lowest pair 

 2-4 cm. long, elliptical to obovate, on short winged petioles, 

 mostly entire, the second pair 4-6 cm. long, elliptical, sessile, 

 sparingly and saliently denticulate, the uppermost pair usually 

 much smaller, narrowly ovate to lanceolate, entire or denticulate, 

 all slightly glandular on both surfaces, the margins sparingly 

 glandular and bearing a few long white hairs, fragrant. 



Heads of flowers 1-3, usually 3, fragrant, 4 cm. broad, borne 

 on lony, slender, nodding, pubescent peduncles, the hairs inter- 

 spersed with glands; ray and disc flowers light yellow, rays 8-10, 

 12-14 mm. long. Involucre 1 cm. high, campanulate, s densely 

 glandular villous at base, brownish-purple, the bracts lanceolate, 

 acute, bearing scattered white hairs especially towards the apex, 

 uniseriate, equal. 



Receptacle slightly convex; achenes linear, strongly striate, 

 brownish-black with a few short, scattered, white hairs; pappus 

 white. 



This species is perhaps more closely related to A. Lessingii, 

 Greene, than to any other, but is a much smaller plant. The mar- 

 gins of the leaves are slightly glandular-ciliate while in A. 

 Lessingii they are strongly pubescent. 



It has usually three heads instead of one only as in that spe- 

 cies; the bracts of the involucre uniseriate instead of biseriate, 

 glandular and villous at base instead of pubescent. The rays are 

 about half the length of those in A. Lessingii. The pale yellow 

 color of the flowers and their drooping tendency distinguish it 

 from other Arnicas of the region. It was found growing among 

 the loose rocks on the slopes of Mt. Fairview, at Lake Louise in 

 the Canadian Rocky Mts. 



Hieracium Albertlnwn, sp. nov. 



25-50 cm. high, the stem villous throughout with long, rigid, 

 white hairs arising from black papillae. 



Leaves 5-12 cm. long, narrowly elliptical, tapering at both 

 ends, the upper sessile, the lower narrowed into margined 

 petioles. 



