Arnica angustifolia subsp. angustifolia

Arnica sornborgeri Fernald, Rhodora 17: 147. 1915
Arnica alpina Lessingii Fern. & Sornb. Ottawa Nat. 13: 106, in part. 1899. Not A. alpina Lessingii A. Gray, 1878.
Rootstock horizontal; stem about 2 dm. high, villous and somewhat viscid throughout, densely so on the peduncles; leaves of the offsets and basal leaves oblaneeolate, tapering below into a short petiole, 6-8 cm. long, entire or slightly denticulate, strongly 3-ribbed, glandularpuberulent and villous; stem-leaves 3 or 4 pairs, all except the lowest pair sessile, entire or rarely denticulate, linear, the uppermost reduced and bract-like; heads solitary; involucre turbinate, 12-15 mm. high, 15-20 mm. broad, uniformly viscidvillous; bracts about 15, linear-lanceolate, attenuate, often tinged with purple towards the apex; ray-flowers about 15, the ligules about 15 mm. long, 4-5 mm. wide, sharply 3-toothed; disk-corollas 7-8 mm. long; pappus-bristles white, 6 mm. long, barbellate.
Type locality: Ramah, Labrador. Distribution : Labrador.

Arnica plantaginea Pursh, FI. Am. Sept. 527. 1814
Arnica anguslifolia T. &. G. Fl. N. Am. 2: 449, in part. 1843. Not A. anguslifolia Vahl, 1816.
Arnica alpina A. Gray. Syn. Fl. N. Am. V: 382. in part. 1884.
Arnica alpina Lessingii Fern. & Somb. Ottawa Nat. 13: 106, in part. 1899.
Rootstock strong and short; stem 2-4.5 dm. high, glabrous or with a few scattered hairs below, densely glandular-puberulent above, especially the peduncles; basal leaves oblanceolate, acute, tapering below into a short petiole, entire, 6-10 cm. long, strongly 3-5-ribbed, sparingly pubescent along the ribs or glabrate; stem-leaves 2-4 pairs, mostly sessile, lanceolate to linear, the uppermost much reduced, more pubescent; heads 1-3; peduncles 3-8 cm. long; involucre turbinate, 10-12 mm. high, about 15 mm. broad, villous at the base and ciliate on the margins, sparingly glandular-puberulent throughout or glabrate above; bracts about 15, linear-oblanceolate, acuminate or acute; ray-flowers 10-15, the ligules 12-15 mm. long, 4—5 mm. wide, 3toothed; disk-corollas 5-6 mm. long; achenes hispid, 5 mm. long; pappus cream-white, barbellate, 5 mm. long.
Type locality: Labrador. DnmBDTnm; Labrador peninsula.

Arnica attenuata Greene, Pittonia 4 : 170. 1900
Rootstock short, strong; stem 1-4 dm. high, villous throughout, densely so and somewhat viscid on the peduncles; leaves of the offsets and basal leaves oblanceolate, 5-15 cm. long, strongly 3-5-ribbed, villous and glandular-puberulent, acuminate at the apex, tapering into a short winged petiole below ; stem-leaves 2-4 pairs, linear-lanceolate, attenuate, sessile, the uppermost reduced; heads 1-5, usually 3; peduncles 5-15 cm. long; involucre broadly turbinate, 12-15 mm. high, 15-20 mm. broad, densely long-villous at the base, less densely so above; bracts 16-20, lanceolate, acuminate, often tinged with purple; ray-flowers about 15, the ligules orange, 15-20 mm. long, 4-5 mm. wide, deeply 3-toothed; disk-corollas 7-8 mm. long; achenes 6 mm. long, hirsute; pappus-bristles 6 mm. long, barbellate.
Type locality: Lewis River. Alaska.
Distribution: Alaska, and Yukon and Northwest territories.