2n = 144

Rhizomatous, usually glabrous, perennial herb; stems slender. Leaves 3-foliolate; leaflets sessile, dull or shiny green, glabrous, obovate-cuneate to suborbicular, 1-4 (-5) mm long, entire or with 2-3 shallow crenate teeth; petioles glabrous or, very rarely, with a few retrorse hairs near blade, slender, (2-) 5-30 (-80) mm long; stipules scale-like. Umbels simple, 1-2-flowered; peduncles equalling or somewhat shorter than leaves; bracts scale-like, fused, c. 0.5 mm long; flowers hermaphrodite, usually sessile, rarely shortly pedicellate, c. 2-3 mm diam. Fruit brown or black, 1.2-1.8 × 1-1.2 mm, more or less rounded on dorsal edge; ribs obscure of slightly raised.

Usually glabrous perennial, forming small to large patches; stems slender. Lvs 3-foliolate; leaflets sessile, dull or shiny green, obovate-cuneate to suborbicular, 1-4-(5) mm long, entire or with 2-3 shallow crenate lobes; petiole usually glabrous, very rarely with a few retrorse hairs near blade. Umbels simple, 1-2-flowered; peduncles ± = or < lvs. Fls usually sessile, rarely shortly pedicellate. Fr. glabrous, 1.2-1.8 × 1-1.2 mm, ± rounded on dorsal edge; ribs obscure or slightly raised.