Compilation
Arnica rydbergii

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Name

Identification
Arnica caespitosa A. Nelson [family ASTERACEAE ] (stored under name); Verified by Nelson, A., 1899 Arnica rydbergii Greene [family ASTERACEAE ] Verified by Jones, A. G., 1988
Related name
  • Arnica caespitosa
  • Arnica fulgens
  • Arnica rydbergii
  • Arnica aurantiaca
Common name
  • Rydberg’s arnica, Flora of North America Vol. 21

Flora

Entry for Arnica rydbergii Greene [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 rydbergii Greene [family COMPOSITAE], Pittonia, 4: 36. 1899
Treatment Author(s)
Steven J. Wolf
Information
Plants 8–35 cm. Stems (branches from rhizomes) simple. Leaves 2–4 pairs (basal often persistent on sterile rosettes), mostly cauline; petiolate (at least basal) or sessile; blades oblanceolate to spatulate, 2–7 × 0.5–2.5 cm, margins usually entire, sometimes denticulate, rarely dentate, apices usually acute, sometimes obtuse, faces sparsely puberulent, moderately pubescent distally, stipitate-glandular. Heads 1–3(–5). Involucres turbinate-campanulate. Phyllaries 9–15, linear-oblong to narrowly lanceolate. Ray florets 6–10; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae brown, 4–7 mm, densely hirsute (not stipitate-glandular); pappi white, bristles barbellate. 2n = 38, 76.
Phenology
jul-aug (summer)
Altitude range
1200–3400 m;
Distribution
USA Colo.USA IdahoUSA Mont.USA Oreg.USA UtahUSA Wash.USA Wyo.Canada Alta.Canada B.C.

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