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broad-leaf arnica, daffodil leopardbane, mountain arnica

Lake Louise arnica, snow arnica

Habit Plants 10–50 cm. Plants 5–20 cm.
Stems

usually simple, sometimes branched distally.

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.

1–3 pairs, mostly cauline (shorter plants often with leaves crowed mostly toward bases); petiolate;

blades elliptic, oblong, or ovate-lanceolate, 1.5–7.5 × 0.5–2 cm, margins usually entire, rarely denticulate or slightly undulate, apices usually obtuse, sometimes acute or acuminate, faces glabrous or hispidulous-puberulent, ± densely stipitate-glandular.

Involucres

narrowly turbinate.

campanulate-turbinate.

Ray florets

8–15;

corollas yellow.

7–10;

corollas yellow.

Disc florets

20–90;

corollas yellow;

anthers yellow.

corollas yellow;

anthers yellow.

Phyllaries

8–20, lanceolate to oblanceolate.

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

Heads

1 or 3–5(–9).

usually 1, sometimes 2–3 (nodding at flowering).

Cypselae

dark brown, 5–9 mm, sparsely villous;

pappi white, bristles barbellate.

brown, 3–5 mm, abaxially glabrous, adaxially sparsely hirsute or glabrous throughout, usually stipitate-glandular toward apices, sometimes densely stipitate-glandular throughout;

pappi white, bristles barbellate.

2n

= 38, 76.

= 76, 95.

Arnica latifolia

Arnica louiseana

Phenology Flowering Jul–Aug. Flowering Jul–Aug.
Habitat Relatively moist, montane conifer forests to subalpine meadows Exposed tundra slopes and calcareous rock slides
Elevation 500–3300 m (1600–10800 ft) 1800–2100 m (5900–6900 ft)
Distribution
from FNA
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; NT; YT
[WildflowerSearch map]
[BONAP county map]
from FNA
AB; BC
[BONAP county map]
Source FNA vol. 21, p. 376. FNA vol. 21, p. 371.
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. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
Name authority Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 147. (1832) Farr: Ottawa Naturalist 20: 109. (1906)
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