provided by North American Flora
Arnica elongata Rydberg, sp. nov
Rootstock rather stout, branched; stem sulcate, 5-7 dm. high, sparingly crisp-villous and somewhat glandular-granuliferous; stem-leaves 4-6 pairs, the lower oblanceolate, acute, dentate, tapering below into short winged petioles connate-sheathing at the base, shortvillous with crisp hairs on both sides, slightly glandular-granuliferous above, ciliolate on the margins, the upper leaves linear-lanceolate, 8-12 cm. long, 1-2.5 cm. wide, rounded at the base; heads many, in a leafy panicle; peduncles 4-6 cm. long, crisp-villous and somewhat glandular; involucre hemispheric, 11-12 mm. high, 12-15 mm. broad, crisp-villous and glandular-puberulent; bracts about 15, linear-lanceolate, acuminate; ray -flowers 10—14, the ligules 12-14 mm. long, 4 mm. wide, with short teeth; disk-corollas 6 mm. long; achenes 5 mm. long, sparingly hirsute; pappus-bristles 6 mm. long, yellowish-brown, short-plumose.
Type collected on mountains south of Chilliwack River, British Columbia, July 25, 1906, W. S. Spreadborounh (herb. Geol. Surv. Canada no. 77007).
Distribution: Alberta to Alaska, British Columbia, and Montana; apparently also in Sierra Nevada, California.
- 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