Arnica unalaschcensis

Lessing

Linnaea 6: 238. 1831.

Common names: Alaska arnica
Treatment appears in FNA Volume 21. Treatment on page 369. Mentioned on page 366, 367.
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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

Distribution

V21-918-distribution-map.gif

Alaska, Asia (Japan, Russian Far East).

Discussion

Selected References

None.

Lower Taxa

None.