Flora of North America species comparison

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Arnica longifolia

long-leaf arnica, seep-spring arnica, spear-leaf arnica, spear-leaf leopardbane
Habit Plants 30–60(–110) cm.
Stems

(often relatively numerous, clustered in clonal patches) simple.
Leaves

5–7 pairs, mostly cauline (basal leaves usually withered by flowering);

sessile or subsessile (proximalmost with connate-sheathing bases);

blades lanceolate to lance-elliptic, 5–12(–15) × 1.5–3.5 cm, margins usually entire, rarely denticulate, apices acute to acuminate, faces scabrid-puberulent, sometimes glandular (distal leaves not much reduced).
Involucres

turbinate-campanulate.
Ray florets

6–15;

corollas yellow.
Disc florets

6–11;

corollas yellow;

anthers yellow.
Phyllaries

11–15(–20), narrow to broadly lanceolate.
Heads

3–20(–35).
Cypselae

brown to black, 3–7 mm, glabrous or sparsely hirsutulous, stipitate-glandular;

pappi stramineous to tawny, bristles barbellate to subplumose.
2n

= 57, 76.

Arnica longifolia
Phenology Flowering Jun–Oct.
Habitat Montane coniferous forests to alpine, usually moist areas, stream banks or late snow-melt areas
Elevation 1300–3700 m (4300–12100 ft)
Distribution
from FNA
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 374.
Parent taxa 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. louiseana, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
Synonyms A. longifolia subsp. myriadenia, A. myriadenia
Name authority D. C. Eaton: in S. Watson, Botany (Fortieth Parallel), 186. (1871)
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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