Plants annual, 50–70 cm, slender, pubescent. Taproot slender. Stem solitary, little-branched. Basal and lower petioles 5–7 cm; blade 1–2-ternate; ultimate segments oblong-ovate, 1.5–4 × 1–2 cm, abaxially pubescent, adaxially pubescent along veins. Upper leaves smaller, 3-lobed, lobes lanceolate, 10–20 × ca. 5 mm. Umbels ca. 2 cm across; bracts 0, occasionally 1, linear; rays 3–5, 0.5–1 cm, unequal; bracteoles 2–4, linear, ca. 3 mm, longer than pedicels; umbellules ca. 6 mm across, 5–8-flowered; pedicels ca. 1 mm. Calyx teeth obsolete. Petals white, broad-ovate, apex slightly notched, with incurved lobule. Stylopodium low-conic; styles ca. 2 × stylopodium. Immature fruit ovoid, base cordate, surface pubescent (mature fruit unknown). Fl. and fr. Jul–Sep.
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