Subherbaceous 2-6 m long climber, leafy stem 1.5-3 mm diam., glabrescent. Leaves: petiole 1-2(-4) cm long, short scabrid-hairy, hairs 0.5 mm long; blade (sub)coriaceous, narrowly ovate to narrowly elliptic, 7-14(-20) by 2-8(-12) cm, upper surface coarsely scabrous by conspicuous (white) cystoliths, lower surface subglabrous, base truncate, shallowly cordate or sagittate with acute lobes to 1.5 cm long, margin entire or faintly dentate with sparse, small but coarse 1 mm long hard teeth. Male inflorescences solitary; peduncle 2-3.5 cm long, subglabrous; raceme short, rarely 2-branched, with 5(-10) flowers; male pedicel 1-2(-5) mm long, female pedicel 10-20 mm long. Mature male and female flowers not seen, presumably similar to those of S. marginata (see note): anthers c. 1.5 mm long; ovary ovoid, c. 3 mm long; sepals lanceolate, c. 1.5 mm long; petals ovate-elliptic, acuminate, c. 5 mm long; staminodes 1.2 mm long; stigma-lobes deeply cleft, c. 2 mm long. Fruit solitary or co-axillary with (previously) developed male inflorescence, globose, 1-1.5 cm diam.; exocarp cartilaginous, glabrous; fruiting pedicel 2-4.5 cm long, subglabrous. Seeds numerous, pale yellowish brown, elliptic or obovate in outline, 6-8 by 4-4.5 by 1-1.5 mm, base narrowed, faces almost smooth or indistinctly scrobiculate, margin narrow but distinct.
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