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mock leopardbane

Nevada arnica, Sierra arnica, Sierran leopardbane

Habit Plants 15–35 cm. Plants 10–50 cm.
Stems

mostly simple.

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).

2–3 pairs, mostly cauline (basal leaves often persistent on sterile rosettes); petiolate (petioles narrowly to broadly winged);

blades elliptic to ovate, 3–8 × 2–4 cm, margins entire or denticulate, apices acute to rounded, faces stipitate-glandular.

Involucres

campanulate to hemispheric.

campanulate-turbinate.

Ray florets

5–12;

corollas yellow.

6–14;

corollas yellow.

Disc florets

(functionally staminate): corollas yellow;

anthers yellow (styles rarely exserted).

corollas yellow;

anthers yellow.

Phyllaries

5–12 (in 1 series), oblong or elliptic.

10–16, oblanceolate.

Heads

1–6.

1(–3).

Cypselae

brown to black, 4–10 mm, sparsely to densely hirsute (hairs usually simple, rarely duplex) and sparsely stipitate-glandular;

pappi 0.

dark gray, 6–9 mm, stipitate-glandular;

pappi white or tawny, bristles barbellate to subplumose.

2n

= 38, 76.

= 76.

Arnica dealbata

Arnica nevadensis

Phenology Flowering Jun–Aug. Flowering Jul–Aug.
Habitat Open forests, meadows, slopes Coniferous forests, meadows, rocky slopes
Elevation 1200–2400 m (3900–7900 ft) 1500–3000 m (4900–9800 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 375. FNA vol. 21, p. 374.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica
Sibling taxa
A. acaulis, A. angustifolia, A. cernua, A. chamissonis, A. cordifolia, A. discoidea, A. fulgens, A. gracilis, A. griscomii, A. lanceolata, A. latifolia, A. lessingii, A. lonchophylla, A. longifolia, A. louiseana, A. mollis, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
A. acaulis, A. angustifolia, A. cernua, A. chamissonis, A. cordifolia, A. dealbata, A. discoidea, A. fulgens, A. gracilis, A. griscomii, A. lanceolata, A. latifolia, A. lessingii, A. lonchophylla, A. longifolia, A. louiseana, A. mollis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
Synonyms Whitneya dealbata A. tomentella
Name authority (A. Gray) B. G. Baldwin: Novon 9: 460. (1999) A. Gray: Proc. Amer. Acad. Arts 19: 55. (1883)
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