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Montana Field Guide

Montana Field Guides

Narrowleaf Arnica - Arnica angustifolia


Global Rank: G5
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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General Description
Stems solitary, erect, 5–25 cm. Herbage glandular, villous. Leaves: basal and cauline similar; blades entire, narrowly lanceolate, 2–7 cm long; basal leaves petiolate; stem leaves 1 to 3 pairs, becoming sessile. Heads solitary; involucre campanulate, 10–15 mm high, densely villous. Rays 9 to 14; ligules 1–2 cm long. Pappus short-barbed, white. Achenes hirsute, 3–8 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Our plants are subspecies tomentosa (J.M. Macoun) G.W. Douglas & Ruyle-Douglas.

Range Comments
Circumpolar south to MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat
Stony, calcareous soil of exposed ridges, talus slopes; upper subalpine to alpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Narrowleaf Arnica — Arnica angustifolia.  Montana Field Guide.  .  Retrieved on , from