Annual or possibly short-lived perennial herb, erect to 40 cm tall. Stems herbaceous, but slightly woody towards the base, slender, 2.0-3.5 mm in diameter at base, unbranched or with few branches, glabrous. Leaves lyrate-pinnatifid (uppermost) or deltoid to deltoid-reniform, usually with 1-4 pairs of lateral leaflets below lamina, terminal leaflet largest; lamina of terminal leaflet 7-26 x 7-21 mm; lamina (including first pair of leaflets) 10-32(-45) × 8-30 mm, total leaf length up to 90 mm long with petiole accounting for half to one third of length, glabrous, usually with few glandular hairs in angles of lobes, occasionally sparsely hairy on veins below, texture usually ‘papery-thin’; apex acute; margin coarsely dentate; base cuneate to truncate to subcordate; petiole 7-35(-50) mm long, glabrous, with cobwebby axils; auricles small, lanceolate, sometimes dentate, caducous. Capitula heterogamous, radiate, usually few (2-12 per branch), rarely as many as 40 per branch in a lax corymbose panicle; peduncles 5-32 mm long, glabrous, with few minute bracts descending (rarely densely bracteate). Involucre calyculate; phyllaries (7-)8-12, 4 mm long, glabrous; margins scarious. Ray florets 5-8, 4-6 mm long; limb 3.0-4.2 mm long, 4-veined. Disc florets c. 24; corolla 3.0-3.5 mm long. Cypselae narrowly obovate, compressed, margined, brown, 2.2-2.5 mm long, sparsely to fairly ciliate; faces usually sparsely hairy, occasionally glabrous. Pappus approximately equal to length of disc floret corolla.
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