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Montana Field Guide

Montana Field Guides

Smallhead Arnica - Arnica latifolia var. gracilis
Other Names:  Arnica gracilis


Global Rank: G5
State Rank: SNR

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

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General Description
Stems often in dense clumps and branching above, 10–30 cm. Leaf pairs 2–3, mostly cauline, the uppermost pair often reduced; blades ovate to ovate-lanceolate, margins irregularly serrate, apex acute; lower surface glandular, upper surface stipitate-glandular. Heads rarely only one but mostly 5 to 15. Involucres turbinate-campanulate. Phyllaries 10–16, ovate-lanceolate. Flowers yellow; rays 5–12. Achenes 4.5-7 mm long, black, hairy (hairs duplex) and stipitate-glandular. Pappus barbellate, bristles white (adapted from Wolf, 2006, Fl. N. America, Vol. 21).

Phenology
July and August.

Range Comments
BC and AB south to OR, UT, and CO (Kartesz 2009).

Habitat
Dry, exposed, rocky, alpine slopes, sometimes subalpine meadows; 1200–2500 m (Wolf, 2005, in Fl. North America, Vol. 21).

References
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Citation for data on this website:
Smallhead Arnica — Arnica latifolia var. gracilis.  Montana Field Guide.  .  Retrieved on , from