Perennial herb or subshrub with much-branched stems, woody towards base, up to c. 1 m. tall, us. shorter, arising from stout stock, often scrambling. Lvs cauline, pinnate, alt., on slender petioles with broad membr. 2-lobed sheathing bases. Lflts 2-5 pairs, 2.5-6·5 × (1)-3 cm., subcoriac., sessile, ± obliquely ovate to ovate-lanceolate, acute to acuminate, furnished with a minute pair of stipules; margins finely serrate. Umbels us. ∞, compound, axillary and terminal, up to ± 8 cm. diam. on slender peduncles up to c. 3 cm. long. Primary rays ∞, slender, up to c. 2 cm. long; secondary very short, umbellules densely fld. Calyx-teeth narrow-triangular; petals white. Fr. ovate-cordate in outline, ± 3-(4) mm. long; mericarps with 2 broad lateral wings, dorsal ribs prominent. Vittae 1 per furrow, 2 on commissural face.