Compilation
Arnica longifolia

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Name

Identification
Arnica polycephala A.Nelson [family COMPOSITAE ] Verified by Not on sheet, Arnica longifolia D.C.Eaton [family COMPOSITAE ] (stored under name); Verified by Not on sheet, Arnica polycephala A.Nelson [family COMPOSITAE ] Verified by Not on sheet,
Related name
  • Arnica scaberrima
  • Arnica polycephala
  • Arnica mollis
  • Arnica caudata
  • Arnica longifolia
Common name
  • Spearleaf arnica, Flora of North America Vol. 21

Flora

Entry for Arnica longifolia D. C. Eaton [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Arnica longifolia D. C. Eaton [family COMPOSITAE], in S. Watson, Botany (Fortieth Parallel), 186. 1871
Arnica longifolia subsp. myriadenia (Piper) Maguire [family COMPOSITAE]
Arnica myriadenia Piper [family COMPOSITAE]
Treatment Author(s)
Steven J. Wolf
Information
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
jun-aug (summer), sep-oct (fall)
Altitude range
1300–3700 m;
Distribution
USA Calif.USA Colo.USA IdahoUSA Mont.USA Nev.USA Oreg.USA UtahUSA Wash.USA Wyo.Canada Alta.Canada B.C.

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