provided by North American Flora
Arnica tomentosa J. M. Macoun; Greene, Pittonia
4: 168. 1900.
Rootstock short, strong; stem 1-2 dm. high, rather densely villous with long white hairs; leaves of the offsets and basal leaves oblaneeolate, 3-ribbed, 2-7 cm. long, acute, entire, tapering below into a short winged petiole, densely long-villous; stem-leaves usually 2 pairs, the lower linear-lanceolate to linear, sessile, 4—6 mm. long, the upper mostly lanceolate, 1-3 cm. long; heads usually solitary; peduncles 3-10 cm. long; involucre broadly turbinate, about 15 mm. high, 15-20 mm. broad, densely long-villous throughout; bracts 12-15, lanceolate, acuminate; ray-flowers 10-15, the ligules orange, 10-15 mm. long, 4 mm. wide, deeply 3-toothed, sparingly villous on the lower side; disk-corollas 6-7 mm. long; achenes 5-6 mm. long, hirsute; pappusbristles white, 7-8 mm. long, barbellate.
Type locality: Rocky Mountains near Athabasca River.
Distribution: Alberta, northern Montana, and British Columbia to southern Yukon Territory and southeastern Alaska.
- bibliographic citation
- Per Axel Rydberg. 1927. (CARDUALES); CARDUACEAE; LIABEAE, NEUROLAENEAE, SENECIONEAE (pars). North American flora. vol 34(4). New York Botanical Garden, New York, NY