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broad-leaf arnica, daffodil leopardbane, mountain arnica

Mount Shasta arnica, Mt. Shasta arnica, Shasta arnica

Habit Plants 10–50 cm. Plants 20–50 cm.
Stems

usually simple, sometimes branched distally.

branched (prominently ribbed, strongly stipitate-glandular; caudices woody).

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.

5–10 pairs (main stems, 2–6 pairs on branches; basal withered by flowering), cauline;

sessile;

blades obovate-oblong to ovate-oblong, (1–)2–4(–5) × 1–3 cm, margins ± entire, apices acute, faces sparsely to densely pilose, densely stipitate-glandular.

Involucres

narrowly turbinate.

narrowly turbinate.

Ray florets

8–15;

corollas yellow.

0.

Disc florets

20–90;

corollas yellow;

anthers yellow.

10–30;

corollas cream;

anthers yellow.

Phyllaries

8–20, lanceolate to oblanceolate.

10–20, broadly lanceolate (stipitate-glandular).

Heads

1 or 3–5(–9).

10–20.

Cypselae

dark brown, 5–9 mm, sparsely villous;

pappi white, bristles barbellate.

dark gray, 4.5–6.5 mm, stipitate-glandular;

pappi usually white, rarely tawny, bristles barbellate to subplumose.

2n

= 38, 76.

= 38.

Arnica latifolia

Arnica viscosa

Phenology Flowering Jul–Aug. Flowering Aug–Sep.
Habitat Relatively moist, montane conifer forests to subalpine meadows Open, rocky subalpine to alpine
Elevation 500–3300 m (1600–10800 ft) 1700–2500 m (5600–8200 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; OR
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 376. FNA vol. 21, p. 377.
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. fulgens, 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
Synonyms Chrysopsis shastensis, Raillardella paniculata
Name authority Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 147. (1832) A. Gray: Proc. Amer. Acad. Arts 13: 374. (1878)
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