Scandent herb scrambling to ± 7.5 m. or more by means of prehensile petioles and petiolules.. Stems slender, glabrous, weak, terete, striate, ± shrinking at the nodes when dry.. Leaves glabrous, ternate to bi-or subtriternate, with slender petioles 2.5–8 cm. long, sheaths short (3–4 mm.) and broad, leaflets distinctly petiolulate; leaflets ovate to lanceolate-ovate, rounded to subcordate at the base, short-to long-acuminate, regularly serrate with the upwardly directed teeth excurrent in a setaceous mucro, the terminal leaflets largest, 2–8 × 0.6–3.5 cm.. Umbels large, mostly 9–11 cm. in diameter, on 2–11 cm. peduncles; rays (6–)12–20, 2–6 cm. long, frequently with some more shortly and delicately stalked probably functionally ♂ flowers mixed among the partial umbels, sometimes ± entire umbels of such flowers present; involucre of ± 6 reflexed, 3–5-nerved, pale-margined, oblong, acuminate to rather blunt, finely ciliate, 4–6 mm. bracts; partial umbels 6–20-flowered; pedicels capillary, 6–18 mm.; involucel similar to the involucre but the bracteoles only 3–3.5 mm. long.. Petals white or greenish-to yellowish-white, ± 1 mm.. Fruit ovoid-elliptic, ± 4 mm., glabrous, one mericarp frequently abortive and the fruit thus “humped” on the fertile side, blackish brown at maturity; stylopodia conical, subequalled by the short deflexed styles.. Fig. 18.
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