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Parry's arnica

Habit Plants 1.5–7 dm; rhizomatous.
Stems

simple to much branched, villous, stipitate-glandular distally.

Basal leaves

withered by flowering, often in separate sterile rosettes, petiolate or subsessile.

Cauline leaves

2–4 pairs; lowermost crowded near stem bases; upper pairs much reduced;

blades ovate to lanceolate or linear-elliptic, 2–10 cm, bases rounded or attenuate;

margins entire or denticulate;

veins branching laterally;

tips acute;

surfaces villous-tomentose, sparsely stipitate-glandular or gland-dotted adaxially; lowermost long-petiolate; upper sessile.

Peduncles

stipitate-glandular.

Involucres

campanulate, 10–15 mm.

Ray florets

0 or obscure.

Disc florets

20–60;

corollas 8–10 mm, yellow.

Phyllaries

narrowly oblanceolate to elliptic or linear;

tips acute or acuminate;

surfaces stipitate-glandular, sometimes also hispid.

Fruits

columnar-fusiform, 4–6 mm, dark brown or blackish, glabrous or hispid;

pappus bristles 7–10 mm; straw-colored, barbellate.

Heads

discoid or rarely obscurely radiate, nodding in bud.

2n

=38, 57, 76.

Arnica dealbata

Arnica parryi

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Coniferous forests, meadows, ridges. Flowering Jun–Sep. 1200–2700 m. BR, BW, Casc, ECas, Sisk. CA, ID, NV, WA; north to Yukon, northeast to Alberta, east to WY, southeast to CO. Native.

Source Flora of Oregon, volume 2, page 186
Kenton Chambers
Sibling taxa
A. cernua, A. chamissonis, A. cordifolia, A. discoidea, A. diversifolia, A. fulgens, A. gracilis, A. lanceolata, A. latifolia, A. longifolia, A. mollis, A. nevadensis, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. viscosa
A. cernua, A. chamissonis, A. cordifolia, A. discoidea, A. diversifolia, A. fulgens, A. gracilis, A. lanceolata, A. latifolia, A. longifolia, A. mollis, A. nevadensis, A. rydbergii, A. sororia, A. spathulata, A. viscosa
Synonyms Arnica parryi var. parryi, Arnica parryi var. sonnei
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