Seed 5 mm. in diam., globose; hilum reniform.
Annual herbaceous or slightly woody climber, densely puberulous; internodes 4–8(11) cm. long.
Leaves pinnate to biternate; petiole 0·5–3(4·5) cm. long; rhachis 1–3 cm. long.
Leaflets with lowest pair ternate, terminal one 2–4 × 1–2 (2·3) cm., lateral ones 2–3·5 × 1–2 cm., lamina with upper surface bright green and under surface grey-green with raised venation, puberulous, apex obtuse and apiculate, margin crenate to lobed, base attenuate.
Inflorescence an axillary many-branched numerous-flowered corymbose thyrse; peduncle c. 6 cm. long, pubescent, multibracteate.
Flowers white to creamy yellow, 4–6 mm. long.
Sepals with lateral ones c. 1 mm. long, anterior and posterior ones c. 3 mm. long, ovate.
Petals 4–5 mm. long, 2 anterior ones ovate with small petaloid appendages, 2 posterior ones ovate bearing recurved appendages with clavate apices covered with patent hairs which cause them to cohere.
Stamens with the filaments of the inner ones slightly shorter; filaments free.
Fruit 2–3·6 cm. long, 3-gonous or 3-quetrous.
Seeds black, 4.5–5 mm. diameter; hilum white, reniform or cordate, 3 mm. long, 3.5 mm. wide.
Fruit green to orange or rusty red, ovoid or usually ellipsoid, (2–)2.5–3.5(–4) cm. long, (1.5–)2–3.3 cm. wide, finely velvety when young; septa elliptic, longer than wide.
Ovary 2–3 mm. long; style 0.5–1 mm. long; stigmas ± 0.5 mm. long.
Stamens 8, with filaments 3–4 mm. long, pilose.
Petals white or cream, elliptic, (3–)4–6 mm. long, 2–3.5 mm. wide; appendage orange.
Sepals unequal; outer broadly elliptic to ± round, 1.5–2 mm. long, 1.5 mm. wide, inner elliptic, 3–5.5 mm. long, 2–3 mm. wide.
Inflorescences corymbose to paniculate, the rhachis with 3–5, few-flowered corymbiform racemoid thyrses, grey-pubescent, or a paniculate thyrse 0.4–1.5 cm. long with 6–12 racemoid thyrses 0.2–1.1 cm. long; peduncle below tendrils (2–)3–12 cm. long, above 0.2–1.3 cm. long; secondary peduncles 0.2–1.4 cm. long; pedicels 2–4 mm. long.
Leaves stipulate, biternate or pinnate, triangular or ovate in outline, up to 9 cm. long, 10 cm. wide, mostly densely velvety pubescent, in biternate examples composed of 3 main divisions, the median larger than the laterals; petiole 0.3–2(–3) cm. long; first order petiolules 0.1–3 cm. long, second order petiolules 0–1 cm. long; terminal leaflet ovate, 1–5.2 cm. long, 0.5–4.5 cm. wide, acute to acuminate and apiculate at the apex, attenuate-decurrent to truncate or cordate at the base, crenate to serrate or deeply lobed.
Annual herbaceous to slightly woody climber, 0.3–4.5 m. tall; stems deeply grooved, densely shortly pubescent.