Ascending, glabrous perennial herb, sometimes scrambling over other herbs, with the lower internodes rooting, 0.5–1.6 m. from the uppermost rooting node upwards.. Stem fistular, succulent, coarsely ribbed and furrowed, up to ± 1 cm. wide below, little branched; internodes long, to ± 14 cm.. Lower leaves with the lamina deltoid in outline, ± 8–22 cm. long and 10–30 cm. wide, bipinnate with 3–5 pairs of pinnae, 2–3(–4) pairs of which are stalked; pinnules in 1–2 pairs, the leaflets lanceolate to elliptic-lanceolate, ± 12–50 × 5–20 mm., rather regularly to somewhat irregularly serrate-dentate, the apical and basal in particular often incised on one or both sides, teeth with a rather long, sharp mucro; sheaths narrowly oblong, striate, rounded or auriculate above, ± 1.5–5 cm., broadly membranous-margined; petiole 3–12 cm.; upper leaves similar, becoming smaller, sessile and finally pinnate or trisect.. Umbels on 5–15 cm. peduncles, ± 11–21-rayed, the rays 0.6–3(–3.8) cm., sometimes a central umbellule sessile; involucre absent or of 1–2 linear bracts 3–18 mm. long, usually with abroad, sheathing base; partial umbels ± 10–24(–30)-flowered; pedicels 1.5–3 mm.; involucel of 6–9 very narrow bracteoles 2–8 mm. long, not too considerably exceeding the flowers.. Calyx-teeth small, subulate, subequal, shorter than the petals.. Petals white to creamy-green, oblong-obovate, ± 0.75 mm., incurved.. Fruit broadly oblong, ± 3–4 × 2–3 mm., 4 dorsal ribs broad and rounded, all subequal, marginal/commissural ribs flattened; stylopodia conical; styles rather short, divergent, ± 0.75–1 mm., longer than the stylopodia.. Fig. 26/5, 6.
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