Arnica dealbata

Plants 15–35 cm. Stems mostly simple. Leaves 3–8 pairs, mostly crowded toward bases; petiolate (at least proximal); blades elliptic to oblanceolate or obovate, 5–10 × 0.5–3.5 cm, margins entire, apices acute, faces densely hairy (hairs relatively short, curly) and sessile-glandular (distal leaves sessile, much reduced). Heads 1–6. Involucres campanulate to hemispheric. Phyllaries 5–12 (in 1 series), oblong or elliptic. Ray florets 5–12; corollas yellow. Disc florets (functionally staminate): corollas yellow; anthers yellow (styles rarely exserted). Cypselae brown to black, 4–10 mm, sparsely to densely hirsute (hairs usually simple, rarely duplex) and sparsely stipitate-glandular; pappi 0. 2n = 38, 76.

Phenology: Flowering Jun–Aug.
Habitat: Open forests, meadows, slopes
Elevation: 1200–2400 m

Calif.

Discussion

Although Arnica dealbata lacks pappi, morphologic, cytologic, and molecular data (B. G. Baldwin and B. L. Wessa 2000; Baldwin et al. 2002) clearly support its inclusion in Arnica.

Selected References

None.

Lower Taxa