Arnica spathulata

Plants 15-45+ cm. Stems simple or branched. Leaves 3-5 pairs, sometimes crowded toward bases (basal leaves often persistent on sterile rosettes); petiolate (petioles mostly broadly winged, 1-9 × 0.2-1.5 cm); blades elliptic-ovate to spatulate, 2-8 × 1-4 cm, margins subentire to mostly irregularly dentate, apices acute, faces sparsely to densely villous, stipitate-glandular. Heads 1, or 3-9(-25). Involucres turbinate-campanulate. Phyllaries 8-15, broadly to narrowly lanceolate. Ray florets 0. Disc florets 15-50; corollas yellow; anthers yellow. Cypselae black, 5-10 mm, sparsely stipitate-glandular; pappi white, bristles barbellate. 2n = 38, 76.

Flowering Apr-Jul. Usually serpentine soils, open, dry oak-conifer forests, disturbed areas; 200-1500 m; Calif., Oreg.