Short-lived perennial herb, erect, to c. 0.75 m. Stems herbaceous, woody towards the base, slender, branching, glabrous. Leaves deltoid to hastate in outline, deeply lobed with apical lobe usually more than half total length of lamina, upper leaves often pinnatifid or very dissected; lamina 13-58 x 9-50 mm, lower leaves deeply to occasionally shallowly lobed; lamina 8-48 x 7-40 mm, glabrous, but with few hairs on margin in angles of lobes; apex acuminate; margin dentate; base truncate to subcordate; petiole (5-)11-47(-58) mm long, glabrous; auricles present, lanceolate, dentate. Capitula heterogamous, radiate, many, arranged in lax corymbose panicles; peduncles 7-31(-43) mm long, glabrous, bracteate (bracts below capitula 1.6-3.0 mm long). Involucre calyculate; phyllaries 8(-12), (3.5-)4-5(-6) mm long, glabrous; margins scarious. Ray florets 5 or 6, 5.0-7.5 mm long; limb 3-5 mm long, 4-veined (rarely 5-or 8-veined). Disc florets 12-16(-21); corolla 3.5-5.0 mm long. Cypselae obovate, compressed, margined, brown, 2.0-3.0 mm long, glabrous. Pappus c. 3.5 mm long.
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