Glab. herb with slender stems and branches, us. arching and rooting at nodes, forming open patches up to ± 2 dm. diam. Lvs us. crowded at nodes, on slender petioles up to ± 5 cm. long; stipules laciniate. Lamina 3-foliolate to deeply 3-partite, membr., pale green, glossy, up to c. 2 cm. diam. Lflts obovate-cuneate, with 3-6 rounded lobes. Peduncles us. not > ± 5 mm. long. Umbels simple (occ. the infl. axis may bear up to 4 umbels at intervals), 4-12-fld, or occ. with 2-3 long-pedicelled secondary umbels from base of primary; secondary umbels sts again umbellulate. Involucral bracts linear to narrow-lanceolate, acute or obtuse. Occ. a pedicel replaced by small 1f. Fr. ± ovoid, bluntly 4-angled, c 2 mm. long, on filiform pedicels up to ± 5 mm. long. Mericarps rather obscurely 5-ribbed.

2n = 48