Flora of North America species comparison

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Arnica viscosa

Mount Shasta arnica, Mt. Shasta arnica, Shasta arnica
Habit Plants 20–50 cm.
Stems

branched (prominently ribbed, strongly stipitate-glandular; caudices woody).
Leaves

5–10 pairs (main stems, 2–6 pairs on branches; basal withered by flowering), cauline;

sessile;

blades obovate-oblong to ovate-oblong, (1–)2–4(–5) × 1–3 cm, margins ± entire, apices acute, faces sparsely to densely pilose, densely stipitate-glandular.
Involucres

narrowly turbinate.
Ray florets

0.
Disc florets

10–30;

corollas cream;

anthers yellow.
Phyllaries

10–20, broadly lanceolate (stipitate-glandular).
Heads

10–20.
Cypselae

dark gray, 4.5–6.5 mm, stipitate-glandular;

pappi usually white, rarely tawny, bristles barbellate to subplumose.
2n

= 38.

Arnica viscosa
Phenology Flowering Aug–Sep.
Habitat Open, rocky subalpine to alpine
Elevation 1700–2500 m (5600–8200 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 377.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica
Sibling taxa
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. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa
Synonyms Chrysopsis shastensis, Raillardella paniculata
Name authority A. Gray: Proc. Amer. Acad. Arts 13: 374. (1878)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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