Arnica ovalis

Arnica ovalis Rydberg, sp. nov
Rootstock short, horizontal; stem about 3 dm. high, glabrous beneath, villous above, terete; leaves of the offsets unknown; basal leaves small, ovate, short-petioled, soon withering; stem-leaves about 3 pairs, the lowest pair petioled, the petioles about 3 cm. long, the blades oval, 4-5 cm. long, about 2.5 cm. wide, firm, scabrous-puberulent and sparingly villous, dentate, acute at each end, the middle pair subsessile, lanceolate, 5-6 cm. long, about 1.5 cm. wide, the uppermost pair sessile, 1-2 cm. long, lanceolate ; heads 3-5; involucre turbinate, 12-14 mm. high and about as broad, white-villous; bracts 10-12, oblanceolate, acute or short-acuminate; rayflowers about 10, the ligules orange, 12-15 mm. long, 5-6 mm. wide, rounded and entire or indistinctly denticulate at the apex; disk-corollas 8 mm. long; achenes hirsute, 5 mm. long; pappus-bristles white, 8 mm. long, barbellate.
Type collected at Crow Nest Pass, (Canadian) Rocky Mountains, July 31, 1897, Macoun (Geol. Surv. Can. no.) 7271V.
Distribution: Southern Alberta to northern Washington.