Spearleaf Arnica

Arnica longifolia D. C. Eaton, in S. Wats. Bot. King's Expl
186. 1871.
Arnica polycephala A. Nels. Bot. Gaz. 30: 202. 1900.
Rootstock much branched, often forming clumps; stems several, 3-8 dm. high, strawcolored, puberulent and glandular-granuliferous; offsets rarely seen in collections, their blades 10-15 cm. long, linear-oblanceolate, acute at the apex, tapering at the base into the petiole; basal leaves withered at the flowering time; stem-leaves several pairs, linear-lanceolate or linear, entire or denticulate, sessile or the lower with a connate sheathing base, 8-15 cm. long, 1-2 cm. wide, more or less puberulent and glandular-granuliferous; heads numerous, in leafy cymes; peduncles 4-10 cm. long; involucre turbinate, about 10 mm. high, 10-15 mm. broad, hirsute, puberulent, and glandular-granuliferous; bracts 16-20, linear-lanceolate, attenuate or acuminate; ray-flowers 10-15, the ligules pale-yellow, 10-12 mm. long, 4 mm. wide, 3-toothed at the apex, the tube strongly pubescent; disk-corollas 6 mm. long, the tube densely villous; achenes 5 mm. long, glandular-granuliferous and sometimes also slightly hirsute; pappusbristles yellowish, 7 mm. long, short-plumose.
Type locality: Clover Mountains. Nevada.
Distribution: Montana to Washington, Colorado, and California.

Arnica myriadenia Piper, Proc. Biol. Soc. Wash 33: 106. 1920.
Rootstock or caudex much branched; stems several, 3-5 dm. high, densely glandularpuberulent and somewhat hirsutulous above; basal leaves at flowering time none; cauline leaves 4 or 5 pairs, sessile; blades of the lower ones sheathing at the base, oblanceolate, tapering gradually towards the apex, sparingly denticulate or entire, glandular-muricate on both sides, 4—12 cm. long; upper stem-leaves lanceolate, acuminate; heads 3-5; involucre turbinatehemispheric, 2 cm. broad; bracts about 1 1, narrowly lanceolate, acuminate, densely glandulargranuliferous, and slightly hairy; ligules bright-yellow, 1.5 cm. long, 3-toothed at the apex, the corolla-tube and lower portion of the ligule strongly pubescent ; disk-corollas 6 mm. long, the tube villous; achenes 5 mm. long, glandular-granuliferous and sparingly hirsute; pappusbristles yellowish, short-plumose.
Type locality: Mount Rainier National Park. Washington. Distribution: Known only from the type locality.