Arnica gracilis

Rydberg

Bull. Torrey Bot. Club 24: 297. 1897.

Common names: Smallhead arnica
Endemic
Synonyms: Arnica latifolia var. gracilis (Rydberg) Cronquist
Treatment appears in FNA Volume 21. Treatment on page 376. Mentioned on page 368.
Revision as of 21:15, 5 November 2020 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Plants 10–30 cm. Stems (often 5–10 in dense clumps) branched distally. Leaves 2–3 pairs, mostly cauline (basal leaves often persistent on sterile rosettes, similar to cauline leaves); petiolate (petioles narrowly to broadly winged, distal pair of leaves often reduced, connate-perfoliate); blades ovate to ovate-lanceolate, 2–6 × 1–3 cm, margins irregularly serrate to subentire, apices acute, faces: abaxial glandular, adaxial stipitate-glandular. Heads (1–)5–15. Involucres turbinate-campanulate. Phyllaries 10–16, ovate-lanceolate. Ray florets 5–12; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae black, 4.5–7 mm, hairy (hairs duplex) and stipitate-glandular; pappi white, bristles barbellate. 2n = 57, 76.


Phenology: Flowering Jul–Aug.
Habitat: Dry, exposed, rocky, alpine slopes, sometimes subalpine meadows
Elevation: 1200–2500 m

Distribution

V21-946-distribution-map.gif

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

Discussion

Selected References

None.

Lower Taxa

None.