Arnica angustifolia

Plants 5-40 cm. Stems usually simple, rarely branched. Leaves 1-5 pairs, mostly cauline; petio-late (petioles broadly to narrowly winged, shorter than blades); blades broadly lanceolate to linear, 2-20 × 0.3-4 cm, margins entire or irregularly denticulate or dentate, apices acute or acuminate, faces glabrous or densely woolly-villous and stipitate-glandular. Heads 1-3(-5; erect). Involucres hemispheric. Phyllaries 9-22, usually narrowly to broadly lanceolate, sometimes oblanceolate. Ray florets 6-16; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae brown, 3-8 mm, densely hirsute, rarely glandular; pappi white, bristles barbellate.