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clasping arnica, streambank arnica

Chamisso arnica, meadow arnica

Habit Plants (0.5)1–10 dm; strongly rhizomatous.
Stems

simple or branched distally, puberulent to villous or woolly-tomentose, sometimes glabrate proximally.

Basal leaves

small, usually withering early.

Cauline leaves

4–10 pairs; well developed;

blades narrowly to broadly lanceolate or elliptic, 2–18 cm;

margins entire to denticulate or dentate;

veins branching laterally;

tips acute or obtuse;

surfaces glabrous to puberulent, setose, villous, or woolly-tomentose, not glandular, proximally short-petiolate, distally sessile, sometimes winged.

Peduncles

puberulent to tomentose, sometimes minutely glandular.

Involucres

campanulate, 8–13 mm.

Ray florets

8–13;

rays 5–20 mm, yellow.

Disc florets

30–50+;

corollas 7–11 mm, yellow.

Phyllaries

lance-linear to lance-elliptic or oblanceolate;

tips acute, with conspicuous tuft of white trichomes;

surfaces puberulent to tomentose, sometimes minutely glandular.

Fruits

columnar, 4–6 mm; blackish, glabrous to minutely puberulent;

pappus bristles 4–6 mm, white or straw-colored, barbellate to subplumose.

Heads

radiate.

2n

=38, 57, 76.

Arnica lanceolata

Arnica chamissonis

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

Moist meadows, wet forests, streambanks. Flowering May–Sep. 800–2300 m. BR, BW, Casc, ECas, Lava, Owy. CA, NV, ID, WA; throughout Canada and western US. Native.

Source Flora of Oregon, volume 2, page 183
Kenton Chambers
Sibling taxa
A. cernua, A. chamissonis, A. cordifolia, A. discoidea, A. diversifolia, A. fulgens, A. gracilis, A. latifolia, A. longifolia, A. mollis, A. nevadensis, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. viscosa
A. cernua, 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
Subordinate taxa
A. lanceolata ssp. prima
Synonyms Arnica chamissonis ssp. foliosa, Arnica chamissonis ssp. incana, Arnica chamissonis var. foliosa, Arnica chamissonis var. incana
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