Annual or short-lived perennial herb, reaching a height of about 1.0 m. Stems herbaceous, slender, becoming slightly woody near base, unbranched (or rarely multi-stemmed, branching from the base), very densely hairy, c. 2.0 mm in diameter near base. Leaves sagittate to reniform in outline, distinctly 3-or 5-lobed, occasionally with a pair of lateral pinnae; lamina 10-19 × (7-)17-32 mm, (uppermost leaves small and bract-like), green, densely hairy above and below; apex acute; margin with sharply acute, large teeth; base sagittate to cordate; petiole (3-)8-25 mm long, densely hairy; with conspicuous, sharply toothed auricles. Capitula heterogamous, radiate, few, 2-8 per stem branch in a lax corymb; terminal peduncles 24-60(-90) mm long, glabrous, sparsely bracteate near capitula, bracts 1.5-2.0(-4.0) mm long. Involucre calyculate; phyllaries 8, 5.0-5.5 mm long, glabrous; margins scarious. Ray florets 5 or 6(rarely 7 or 8), 7.0-9.0 mm long; limb 5.0-7.0 mm long, 4-veined. Disc florets c. 18-20; corolla 4.5-5.0 mm long. Cypselae narrowly obovate, compressed, brown with paler margins, 2.0 mm long, glabrous. Pappus to base of lobes of disc floret corolla.
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Slender, annual or short-lived, perennial herb, ± 1 m high. Leaves sagittate to reniform in outline, with 3 or 5 very acute lobes; green, densely hairy above and below; with conspicuous, sharply toothed auricles. Capitula few, 2-8 per stem branch in a lax corymb; glabrous; involucral bracts 8, glabrous. Ray florets usually 5 or 6. Disc florets 18-20. Flowering time Mar., Apr. Cypselae narrowly obovate, brown with paler margins, glabrous.
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