Arnica longifolia

D. C. Eaton in S. Watson

in S. Watson, Botany (Fortieth Parallel), 186. 1871

Common names: Spearleaf arnica
Synonyms: Arnica longifolia subsp. myriadenia (Piper) Maguire Arnica myriadenia
Treatment appears in FNA Volume 21. Treatment on page 374. Mentioned on page 368.
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). Heads 3–20(–35). Involucres turbinate-campanulate. Phyllaries 11–15(–20), narrow to broadly lanceolate. Ray florets 6–15; corollas yellow. Disc florets 6–11; corollas yellow; anthers yellow. Cypselae brown to black, 3–7 mm, glabrous or sparsely hirsutulous, stipitate-glandular; pappi stramineous to tawny, bristles barbellate to subplumose. 2n = 57, 76.

Phenology: Flowering Jun–Oct.
Habitat: Montane coniferous forests to alpine, usually moist areas, stream banks or late snow-melt areas
Elevation: 1300–3700 m



Alta., B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.


Selected References


Lower Taxa


Facts about "Arnica longifolia"
AuthorSteven J. Wolf +
AuthorityD. C. Eaton in S. Watson +
Common nameSpearleaf arnica +
DistributionAlta. +, B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. + and Wyo. +
Elevation1300–3700 m +
HabitatMontane coniferous forests to alpine, usually moist areas, stream banks or late snow-melt areas +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering Jun–Oct. +
Publication titlein S. Watson, Botany (Fortieth Parallel), +
Publication year1871 +
ReferenceNone +
Source xml grained fna xml/V19-20-21/V21 937.xml +
SynonymsArnica longifolia subsp. myriadenia + and Arnica myriadenia +
Taxon familyAsteraceae +
Taxon nameArnica longifolia +
Taxon parentArnica +
Taxon rankspecies +
VolumeVolume 21 +