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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus: Arnica||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Arnica longifolia D.C. Eaton
Habit: Plant 3--6 dm from caudex-like rhizome, scabrous, short-hairy distally, often +- sticky. Stem: clustered, often forming large patches. Leaf: basal few, < cauline; cauline 5--7 pairs, most proximal pairs often fused around stem, blade 5--12 cm, +- lanceolate, +- entire, distal +- reduced. Inflorescence: heads radiate, 3--20; involucre 7--10 mm, bell-shaped or widely obconic; phyllaries narrow to widely lanceolate, +- acute, glandular, +- long-hairy, especially tip. Ray Flower: 6--15; ray 10--20 mm. Disk Flower: corolla sparsely soft-hairy, +- stalked-glandular. Fruit: 3--7 mm, +- glabrous to glandular and hairy; pappus short-barbed or +- plumose, yellow-brown to brown. Chromosomes: 2n=57,76.
Ecology: Generally wet meadows, late snow-melt areas, or open conifer forest; Elevation: 1300--3500 m. Bioregional Distribution: KR, s NCoRH, CaRH, SNH, GB; Distribution Outside California: to western Canada, Montana, Colorado. Flowering Time: Jul--Aug Note: Generally asexual in California.
Synonyms: Arnica longifolia subsp. myriadenia (Piper) Maguire
eFlora Treatment Author: Steven J. Wolf & Theodore M. Barkley
Jepson Online Interchange
Previous taxon: Arnica latifolia
Next taxon: Arnica mollis
Citation for this treatment: Steven J. Wolf & Theodore M. Barkley 2017. Arnica longifolia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=1139, accessed on February 20, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 20, 2017.