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broadleaf arnica, mountain arnica

Habit Plants 1–5 dm; strongly rhizomatous.
Stems

usually simple, sometimes branched, glabrous to puberulent or villous.

Basal leaves

withering early, usually in separate sterile rosettes, petiolate.

Cauline leaves

2–4 pairs;

blades ovate, lanceolate, or elliptic, 1.5–14 cm, bases rounded to attenuate, rarely truncate or cordate;

margins entire to denticulate, dentate, or serrate;

veins branching laterally;

tips acute;

surfaces glabrous to puberulent or strigose;

adaxial surfaces sometimes densely and minutely strigillose; most sessile; lower pair sometimes subsessile.

Peduncles

glabrate or villous, sometimes glandular-puberulent at apex.

Involucres

cylindric to campanulate or hemispheric, 8–15 mm.

Ray florets

5–15;

rays 10–28 mm, yellow.

Disc florets

20–90;

corollas 6–10 mm, yellow.

Phyllaries

broadly or narrowly lanceolate to oblanceolate, elliptic, or linear;

tips acute or acuminate;

surfaces glabrous to pilose or villous, sometimes tomentulose or glandular-puberulent at bases.

Fruits

columnar-fusiform, 5–9 mm, dark brown, glabrous to glandular-puberulent;

pappus bristles 5–7 mm, white, barbellate.

Heads

radiate.

2n

=38, 76.

Arnica latifolia

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Coniferous forests, meadows, shrublands, cliffs, rocky talus, clearcuts, roadsides. Flowering May–Sep. 300–2300 m. BW, Casc, CR, ECas, Owy, Sisk. CA, ID, WA; north to AK, northeast to Alberta, east to WY, southeast to NM. Native.

Source Flora of Oregon, volume 2, page 185
Kenton Chambers
Sibling taxa
A. cernua, A. chamissonis, A. cordifolia, A. discoidea, A. diversifolia, A. fulgens, A. gracilis, A. lanceolata, A. longifolia, A. mollis, A. nevadensis, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. viscosa
Synonyms Arnica latifolia var. latifolia
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