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broad-leaf arnica, daffodil leopardbane, mountain arnica

foothill arnica, hillside arnica, orange arnica, shining leopardbane

Habit Plants 10–50 cm. Plants 10–75 cm.
Stems

usually simple, sometimes branched distally.

solitary, simple.

Leaves

2–4(–6) pairs, cauline (basal leaves often persistent on sterile rosettes), petiolate (proximal, petioles relatively short, broadly winged) or sessile (mid and distal);

blades lance-elliptic to ovate, 2–10 × 1–6 cm, margins serrate to dentate, apices obtuse to acute, faces glabrous or sparsely villous.

3–5 pairs, crowded toward stem bases (some or all axils with dense tufts of brown wool); petiolate (petioles at least basal leaves, narrow or broadly winged);

blades (with 3 or 5 prominent, subparallel veins) usually narrowly oblanceolate to oblong, rarely oval or broadly spatulate, 4.5–20 × 0.5–2.5 cm, margins denticulate, apices obtuse, faces moderately uniformly hairy, stipitate-glandular.

Involucres

narrowly turbinate.

broadly hemispheric.

Ray florets

8–15;

corollas yellow.

8–16;

corollas yellow-orange.

Disc florets

20–90;

corollas yellow;

anthers yellow.

corollas yellow;

anthers yellow.

Phyllaries

8–20, lanceolate to oblanceolate.

13–21, elliptic-oblong or narrowly to broadly lanceolate.

Heads

1 or 3–5(–9).

1(–3).

Cypselae

dark brown, 5–9 mm, sparsely villous;

pappi white, bristles barbellate.

brown, 3.5–7 mm, densely hirsute, sometimes sparingly stipitate-glandular;

pappi usually white, sometimes tawny, bristles barbellate.

2n

= 38, 76.

= 38, 57.

Arnica latifolia

Arnica fulgens

Phenology Flowering Jul–Aug. Flowering May–Jul.
Habitat Relatively moist, montane conifer forests to subalpine meadows Prairies and grasslands to montane conifer forests
Elevation 500–3300 m (1600–10800 ft) 500–3000 m (1600–9800 ft)
Distribution
from FNA
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; NT; YT
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; ID; MT; ND; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 376. FNA vol. 21, p. 370.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica
Sibling taxa
A. acaulis, A. angustifolia, A. cernua, A. chamissonis, A. cordifolia, A. dealbata, A. discoidea, A. fulgens, A. gracilis, A. griscomii, A. lanceolata, A. lessingii, A. lonchophylla, A. longifolia, A. louiseana, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
A. acaulis, A. angustifolia, A. cernua, A. chamissonis, A. cordifolia, A. dealbata, A. discoidea, A. gracilis, A. griscomii, A. lanceolata, A. latifolia, A. lessingii, A. lonchophylla, A. longifolia, A. louiseana, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
Synonyms A. monocephala, A. pedunculata
Name authority Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 147. (1832) Pursh: Fl. Amer. Sept. 2: 527. (1813)
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