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Compilation
Arnica rydbergii
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Isotype of Arnica rydbergii Greene [family ASTERACEAE]
Arnica rydbergii Greene [family ASTERACEAE]
Type of Arnica rydbergii Greene [family ASTERACEAE]
Isotype of Arnica rydbergii Greene [family ASTERACEAE]
Arnica rydbergii Greene [family ASTERACEAE]
Type of Arnica caespitosa A. Nelson [family ASTERACEAE]
Isotype of Arnica rydbergii Greene [family ASTERACEAE]
Syntype of Arnica caespitosa A. Nelson [family ASTERACEAE]
Isotype of Arnica rydbergii Greene [family ASTERACEAE]
Isotype of Arnica aurantiaca Greene [family ASTERACEAE]
Syntype of Arnica caespitosa A. Nelson [family ASTERACEAE]
Isotype of Arnica rydbergii Greene [family ASTERACEAE]
Original material of Arnica rydbergii Greene [family ASTERACEAE]
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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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