Fruits reddish purple turning blue-black or violet, or yellow, red or orange, often with a bloom, ellipsoid, 0.9–1 cm. (1.2 cm. in life) long, 4–7 mm. wide.
Seed usually 1, ellipsoid, 7 mm. long, 4 mm. wide; dorsal ridges well marked and with few transverse ridges.
Erect herb 0.9–1.8 m. tall, often ± glaucous when young from an orange ± ovoid tuberous rootstock to 15 cm. long, 5 cm. wide; stems often crimson, swollen at the nodes; plant glabrous except for ciliate stipules or very slightly pubescent; tendrils absent.
Cymes lax, terminal, usually with 3 main branches each again branched, up to 30 cm. wide; peduncle to 25 cm. long and pedicels 3–6 mm. long; bracts and bracteoles subulate, ± 2 mm. long, deciduous.
Leaves very variable, the upper pair often opposite, often red or edged with red, digitately 3(–5)-foliolate; leaflets sessile, linear to oblong-elliptic, 2–30 cm. long, (0.1–)4–10 cm. wide, acuminate or ± obtuse but apiculate at the apex, cuneate at the base, often folded, serrate or serrate-crenate but sometimes so shallowly so as to appear ± entire or only remotely denticulate; venation occasionally strongly raised and reticulate in mature leaves; petioles 0–10 cm. long; stipules lanceolate, 2.5–4 cm. long, 0.8–1 cm. wide, ciliate.
Calyx 0.5 mm. long, entire or shallowly lobed.
Buds oblong-cylindric, ± 3 mm. long, constricted just above the middle.