Arnica longifolia

D. C. Eaton in S. Watson
in S. Watson, Botany (Fortieth Parallel), 186. 1871.
Common names: Spearleaf arnica
Endemic
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

Distribution

V21-937-distribution-map.gif

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

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Arnica longifolia"
Steven J. Wolf +
D. C. Eaton in S. Watson +
Spearleaf arnica +
Alta. +, B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1300–3700 m +
Montane coniferous forests to alpine, usually moist areas, stream banks or late snow-melt areas +
Flowering Jun–Oct. +
in S. Watson, Botany (Fortieth Parallel), +
Arnica longifolia subsp. myriadenia +  and Arnica myriadenia +
Arnica longifolia +
species +