|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus: Arnica||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Arnica discoidea Benth.
Habit: Plant 1.5--6 dm, generally +- long-hairy, short-glandular. Stem: generally 1, branched or not. Leaf: basal often in prominent sterile rosettes; cauline 3--7 pairs, proximal +- narrowly wing-petioled, blade 2--12 cm, lanceolate to ovate or +- cordate, +- toothed, reduced distally on stem. Inflorescence: heads discoid (radiant), 3--10(30); involucre 10--17 mm, obconic to +- hemispheric; phyllaries narrowly lanceolate to lance-ovate, long-hairy, stalked-glandular. Ray Flower: 0 (corolla of peripheral disk florets rarely dilated, resembling rays). Disk Flower: corolla +- soft-hairy, glandular. Fruit: 6--8 mm, forked-hairy and stalked-glandular distally; pappus short-barbed (+- plumose), white. Chromosomes: 2n=38,57,76.
Ecology: Chaparral, foothill woodland; Elevation: 100--1500 m. Bioregional Distribution: NW, CaR, n&c SN, s SNH, CW, WTR, SnBr, w PR, MP; Distribution Outside California: to Washington, western Nevada. Flowering Time: May--Jul Note: Sexual or not. Highly variable; plants with expanded outer disk corollas resemble Arnica cordifolia.
Synonyms: Arnica discoidea var. alata (Rydb.) Cronquist; Arnica discoidea var. eradiata (A. Gray) Cronquist
eFlora Treatment Author: Steven J. Wolf & Theodore M. Barkley
Jepson Online Interchange
Previous taxon: Arnica dealbata
Next taxon: Arnica fulgens
Citation for this treatment: Steven J. Wolf & Theodore M. Barkley 2017. Arnica discoidea, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=1123, accessed on January 19, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on January 19, 2017.