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heart-leaf arnica, heart-leaf leopardbane

Mount Shasta arnica, Mt. Shasta arnica, Shasta arnica

Habit Plants 10–40(–70) cm. Plants 20–50 cm.
Stems

usually simple, sometimes branched.

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

Leaves

2–4(–6) pairs, mostly cauline (basal often persistent on sterile rosettes);

petiolate;

blades cordate or subcordate to ovate, 3–10 × 2–10 cm, margins dentate to coarsely dentate, apices acute to rounded, faces puberulent to sparsely villous, sometimes stipitate-glandular (especially adaxial).

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

broadly campanulate.

narrowly turbinate.

Ray florets

6–13;

corollas yellow.

0.

Disc florets

corollas yellow;

anthers yellow.

10–30;

corollas cream;

anthers yellow.

Phyllaries

10–20, narrowly ovate to lanceolate.

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

Heads

1, or 3–5(–10).

10–20.

Cypselae

dark gray, 5–10 mm, sparsely to densely hirsute (hairs duplex), sometimes stipitate-glandular as well;

pappi white, bristles barbellate.

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

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

2n

= 38, 57, 76, 95, 114.

= 38.

Arnica cordifolia

Arnica viscosa

Phenology Flowering May–Jul. Flowering Aug–Sep.
Habitat Conifer forests to subalpine meadows Open, rocky subalpine to alpine
Elevation 500–3000 m [1600–9800 ft] 1700–2500 m [5600–8200 ft]
Distribution
from FNA
AZ; CA; CO; ID; MI; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 374. 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. 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, 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 A. cordifolia var. pumila, A. paniculata, A. whitneyi Chrysopsis shastensis, Raillardella paniculata
Name authority Hooker: Fl. Bor.-Amer. 1: 331. (1834) A. Gray: Proc. Amer. Acad. Arts 13: 374. (1878)
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