Arnica unalaschcensis


Linnaea 6: 238. 1831

Common names: Alaska arnica
Treatment appears in FNA Volume 21. Treatment on page 369. Mentioned on page 366, 367.
Plants 8–30 cm. Stems simple (sparsely to moderately hairy, hairs translucent with purple septa). Leaves 2–5 pairs, mostly cauline; petiolate (proximal) or sessile; blades elliptic-oblanceolate, obovate or spatulate, (3–)5–12 × 1.5–3 cm, margins usually entire proximal to mid blade, serrate to dentate distally, apices acute to obtuse or abruptly pointed, faces usually glabrate, sometimes scabrous to sparsely stipitate-glandular. Heads 1 (erect). Involucres hemispheric or turbinate-hemispheric (bases moderately villous). Phyllaries 14–24, lanceolate (apices obtuse, tips blunt, callous). Ray florets 6–17; corollas yellow (laminae 12–17 mm). Disc florets: corollas yellow; anthers dark purple. Cypselae brown, 4–5 mm, shortly hispidulous (hairs duplex, apically forked) and stipitate-glandular; pappi tawny, bristles subplumose. 2n = 38.

Phenology: Flowering Jun–Aug.
Habitat: Coastal tundra to alpine slopes
Elevation: 0–1500 m



Alaska, Asia (Japan, Russian Far East).




Lower Taxa

No lower taxa listed.