Roots fibrous. Stems erect, 6-18(-20) dm, glabrous. Leaves mostly cauline, petiolate. Leaf blade 3-4×-ternately compound; leaflets orbiculate to obovate, apically 3-cleft or 3-parted, divisions undivided or shallowly 3-lobed, 15-40 mm wide, lobes rounded or somewhat acute, surfaces glabrous or glandular. Inflorescences terminal, panicles, many flowered. Flowers: sepals whitish to purplish, elliptic to ovate or lanceolate, 2-4(-5) mm; filaments whitish to pinkish, 3-6 mm; anthers (1.4-)2-4 mm, distinctly apiculate. Achenes 10-15, spreading in globose heads, not reflexed, sessile or nearly so; stipe 0-0.6 mm; body nearly globose to obovoid to obliquely obovate, laterally compressed, somewhat inflated and papery, 4-7(-8) mm, glabrous to glandular, often with 1 or 2 primary veins on each side, veins sinuous, branched, anastomosing-reticulate; beak 2-4 mm.
Mixed evergreen and oak forests, mainly below 750 metres in California. Streamsides and other moist places, forests, and open woodlands at elevations of 600-3100 metres.
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