Glab. perennial herb with slender deeply descending taproot; stems very slender, branching, prostrate to ascending, often sublianoid, up to c. 4 dm. long. Lvs mostly 3-foliolate (rarely with 1 or 2 further pairs of lflts), on very slender petioles up to ± 6cm. long. Lflts irregularly lobed or incised; terminal lflts up to c. 10 × 10 mm., us. 3-lobed, on petiolules up to 1 cm. long. Umbels up to 10 mm. diam., on very slender peduncles up to ± 3 cm. long; often 3 at a node or with secondary umbels. Rays unequal, 5-15, up to c. 5mm. long. Petals white. Fr. ovoid, ± compressed, subcordate at base; (1)-2 × 1-(2) mm.; ribs thick.