Plants annual, 30–50 cm, densely pubescent throughout. Taproot slender. Stem slender, little-branched. Leaves heteromorphic. Basal petioles 3–5 cm; blade simple or ternate; ultimate segments ovate-orbicular, cordate, 1–3 × 1–3 cm, margin serrate or incised-dentate. Cauline leaves 1–2-pinnate; ultimate segments linear or lanceolate, 5–15 × 1–2 mm. Umbels 2–5 cm across; bracts and bracteoles 0; rays (4–)15–20, very unequal, 1.5–4 cm, pubescent; umbellules 5–8 mm across, 15–25-flowered; pedicels 0.5–2 mm, unequal. Calyx teeth obsolete. Petals white, obovate, pilose abaxially, apex with incurved lobule. Stylopodium low-conic; styles 2(–3) × stylopodium, spreading. Fruit ovoid-globose, 1–1.5 × 0.9–1.2 mm, densely hairy; vittae 2–3 in each furrow, 4–8 on commissure. Seed face plane. Fl. May–Jun, fr. Jul–Sep.
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