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nodding arnica, Parry's arnica

foothill arnica, hillside arnica, orange arnica, shining leopardbane

Habit Plants 15–50(–60) cm. Plants 10–75 cm.
Stems

simple or branched among heads.

solitary, simple.

Leaves

(2–)3–4 pairs, basal and cauline (basal usually withered by flowering, petiolate or subsessile, blades ovate or nearly round to oblong-ovate, much smaller than cauline; sterile rosettes often present, proximal cauline often crowded toward stems bases);

petiolate;

blades broadly to narrowly lanceolate, oblong-ovate, ovate-lanceolate, or round, 4–22 × 1–6 cm, (bases obtuse or cuneate to truncate) margins usually entire, sometimes sparsely denticulate, faces scantily to moderately pilose (hairs white), adaxial sparsely stipitate-glandular (distal cauline leaves sessile, extremely reduced, nearly linear to narrowly elliptic-lanceolate).

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

turbinate to narrowly campanulate.

broadly hemispheric.

Ray florets

usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary).

8–16;

corollas yellow-orange.

Disc florets

20–50;

corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae);

anthers yellow.

corollas yellow;

anthers yellow.

Phyllaries

8–20, linear to narrowly lanceolate.

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

Heads

(1–)3–9(–14; often nodding in bud).

1(–3).

Cypselae

brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute;

pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose.

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

pappi usually white, sometimes tawny, bristles barbellate.

2n

= 38, 57, 76.

= 38, 57.

Arnica parryi

Arnica fulgens

Phenology Flowering May–Sep. Flowering May–Jul.
Habitat Open conifer forests to alpine meadows Prairies and grasslands to montane conifer forests
Elevation 500–3800 m [1600–12500 ft] 500–3000 m [1600–9800 ft]
Distribution
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; 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. 373. 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. latifolia, A. lessingii, A. lonchophylla, A. longifolia, A. louiseana, A. mollis, A. nevadensis, A. ovata, 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. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei A. monocephala, A. pedunculata
Name authority A. Gray: Amer. Naturalist 8: 213. (1874) Pursh: Fl. Amer. Sept. 2: 527. (1813)
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