Flora of North America species comparison

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Arnica angustifolia

alpine arnica, arctic arnica, narrow-leaf arnica
Habit Plants 5–40 cm.
Stems

usually simple, rarely branched.
Leaves

1–5 pairs, mostly cauline; petiolate (petioles broadly to narrowly winged, shorter than blades);

blades broadly lanceolate to linear, 2–20 × 0.3–4 cm, margins entire or irregularly denticulate or dentate, apices acute or acuminate, faces glabrous or densely woolly-villous and stipitate-glandular.
Involucres

hemispheric.
Ray florets

6–16;

corollas yellow.
Disc florets

corollas yellow;

anthers yellow.
Phyllaries

9–22, usually narrowly to broadly lanceolate, sometimes oblanceolate.
Heads

1–3(–5; erect).
Cypselae

brown, 3–8 mm, densely hirsute, rarely glandular;

pappi white, bristles barbellate.

Arnica angustifolia
Distribution
from FNA
AK; MT; AB; BC; MB; NF; NT; NU; ON; QC; SK; YT; Europe; Asia
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaves linear to broadly lanceolate, faces glabrousor moderately villous
subsp. angustifolia
1. Leaves narrowly lanceolate, faces densely white-woolly-villous
subsp. tomentosa
Source FNA vol. 21, p. 369.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica
Sibling taxa
A. acaulis, 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, A. viscosa
Subordinate taxa
A. angustifolia subsp. angustifolia, A. angustifolia subsp. tomentosa
Synonyms A. alpina subsp. angustifolia, A. alpina var. angustifolia
Name authority Vahl: in G. C. Oeder et al., Fl. Dan. 9(26): 5, plate 1524. (1816)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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