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nodding arnica, Parry's arnica

arnica de Chamisso, Chamisso arnica, leafy arnica, leafy leapordbane, meadow arnica, narrow-leaf arnica, silvery arnica

Habit Plants 15–50(–60) cm. Plants 20–80(–150) cm.
Stems

simple or branched among heads.

usually branched from mid heights or distally.

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).

4–10 pairs, mostly cauline (evenly distributed; basal leaves often withered by flowering, 1–2 pairs, subsessile to short-petiolate);

sessile (proximalmost with membranous connate-sheathing bases);

blades lance-elliptic, broadly oblanceolate, or oblong, 5–20 × 2–6(–8) cm, margins entire or remotely denticulate to prominently dentate, apices acute, faces nearly glabrous or puberulent to sparsely or densely white-tomentose-pilose.

Involucres

turbinate to narrowly campanulate.

campanulate (rarely hemispheric).

Ray florets

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

8–20;

corollas yellow.

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.

8–23, nearly linear to narrowly lanceolate (apices each with conspicuous tuft of white hairs).

Heads

(1–)3–9(–14; often nodding in bud).

(1–)3–10(–16).

Cypselae

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

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

gray to brown, 3–8 mm, subglabrous to sparsely hirsutulous, stipitate-glandular;

pappi stramineous, bristles barbellate to subplumose.

2n

= 38, 57, 76.

= 38, 57, 76.

Arnica parryi

Arnica chamissonis

Phenology Flowering May–Sep. Flowering Apr–Sep.
Habitat Open conifer forests to alpine meadows Moist meadows and conifer forests, stream banks, late snow-melt areas, often montane to subalpine
Elevation 500–3800 m [1600–12500 ft] 0–3500 m [0–11500 ft]
Distribution
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; MB; NT; ON; QC; SK; YT
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 373. FNA vol. 21, p. 372.
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. 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, A. viscosa
Synonyms A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei A. bernardina, A. chamissonis var. bernardina, A. chamissonis subsp. foliosa, A. chamissonis var. foliosa, A. chamissonis subsp. incana, A. chamissonis var. incana, A. chamissonis var. interior, A. chamissonis var. jepsoniana, A. foliosa
Name authority A. Gray: Amer. Naturalist 8: 213. (1874) Lessing: Linnaea 6: 238. (1831)
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