Arnica rydbergii

Greene

Pittonia 4: 36. 1899.

Common names: Rydberg’s arnica
Endemic
Treatment appears in FNA Volume 21. Treatment on page 371. Mentioned on page 367.
Revision as of 21:03, 27 May 2020 by imported>Volume Importer

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: Flowering Jul–Aug.
Habitat: Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows
Elevation: 1200–3400 m

Distribution

V21-929-distribution-map.gif

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

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Arnica rydbergii"
Steven J. Wolf +
Greene +
Rydberg’s arnica +
Alta. +, B.C. +, Colo. +, Idaho +, Mont. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1200–3400 m +
Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows +
Flowering Jul–Aug. +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Arnica rydbergii +
species +