Arnica nutans

Comprehensive Description

provided by North American Flora
Arnica nutans Rydberg, sp. nov
Arnica alpina Lessingii A. Gray, Syn. Fl. N. Am. V: 383, in part. 1884.
Arnica alpina Herder, Bull. Soc. Nat. Mosc. 40 1 : 423, in part. 1867. Not A . alpina Olin & Ladau, 1799. .
Rootstock branched; stem 1-2 dm. high, more or less villous with long white hairs; leaves of the offsets and basal leaves 5-8 cm. long; blades oblanceolate, sparingly denticulate, acute, glabrous or nearly so, except the ciliolate margins; stem-leaves 2 or 3 pairs, usually below the middle of the stem, the lowest pair oblanceolate or narrowly lanceolate, rarely ovatelanceolate, sessile, 5-8 cm. long, the upper smaller; heads usually solitary, rarely 3, nodding; involucre turbinate, about 12 mm. high and 15 mm. broad, densely villous with yellowish or light-brownish hairs at the base, less so or glabrous on the bracts; bracts 10-12, lanceolate or linear-lanceolate, short-acuminate, purplish; rayflowers 8-10, the ligules 15-20 mm. long, 3-4 mm. wide, strongly 7-veined, deeply 3-toothed; disk-corollas 6-7 mm. long; anthers yellow; achenes striate, usually with scattered hairs above; pappus-bristles white, 7 mm. long, barbellate.
Type collected along Tuk-suk Channel, near Port Clarence, Alaska. July 30, 1901. F. A. Walpole 1618 (herb. N. Y. Bot. Gard.).
Distribution: Alaska, and Arakamtchetchene Island and Plover Bay, Siberia; apparently also Yukon Territory.
* With this there was confused the following Siberian species, which might be found in Alaska. This differs mainly in the narrower more glandular leaves, smaller and densely villous involucre and hirsute achenes.
Arnica Sancti-Laurentii Rydberg, sp. nov.
Arnica alpina Less. Linnaea 6: 235, in part. 1831. Not A. alpina Olin & Ladau, 1799. Arnica alpina Lessingii A. Gray, Syn. Fl. N. Am. I 2 : 383, mainly, as to description. 1884. Not A. angustifolia Lessingii T. & G. 1843.
Rootstock branched; stem 1-1.5 dm. high, villous with yellowish hairs; basal leaves small, spatulate; stem-leaves about 2 or 3 pairs, the lowest petioled 4-5 cm. long, with oblanceolate, denticulate blades, villous and glandular-puberulent on both sides, the uppermost reduced, linear; heads solitary, nodding in anthesis; involucre turbinate. 10-12 mm. high and about 1 cm. broad, densely villous throughout; bracts about 12, linear-lanceolate, acute; ray-flowers 6-10, the ligules about 15 mm. long; disk-corollas 6 mm. long; anthers yellow; achenes sparingly hirsute; pappusbristles 6 mm. long, straw-colored, barbellate.
Type collected at St. Laurence Bay, eastern Siberia, Chamisso (Gray Herb.).
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
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