Climbing herb or scrambler; young stems pubescent and sometimes with a few ± gland-tipped more bristly hairs or ± non-glandular setae particularly near nodes, later often purplish and usually ± glabrous; tendrils present.. Leaves (3–)5-foliolate; leaflets oblong-elliptic to elliptic or elliptic-oblanceolate, 1.7–12 cm. long, 1–6 cm. wide, acute or acuminate at the apex, ± cuneate or ± rounded at the base, rather distinctly or irregularly serrate-crenate, sparsely pilose above, densely pubescent beneath or ± glabrous all over except for few hairs on the midrib; petiole 1–6.5 cm. long and petiolules 0.2–1.9 cm. long, that of median leaflet longest, both with multicellular hairs and a few setae particularly at apex of petiole; stipules large, often ± leafy, falcate-oblong, 0.8–1.6 cm. long, 9 mm. wide, mostly rounded at apex, venose and ± ciliate.. Inflorescences 5–15 cm. wide; peduncles 2–7 cm. long, pubescent and with sparse setae; pedicels 2–4 mm. long; bracts and bracteoles ± 1 mm. long; inflorescence-axes often pale to bright ferruginous pubescent.. Buds cylindrical, ± 3.5 mm. long, constricted at the middle, very sparsely to ± densely often ferruginous pubescent but with no gland-tipped hairs.. Calyx 1–2 mm. wide, pubescent and sometimes with black gland-dots.. Petals white or greenish, often tipped maroon.. Fruits ellipsoid, 8 mm. long, 5 mm. wide, with long multicellular hairs and stiffer bristles not obviously glandular or typically with short gland-tipped hairs.. Seeds ovoid, 7 mm. long, 5–6 mm. wide; ventral ridge well marked, with 3 radiating side ridges; dorsal ridges obscure or less marked, but with 3–4(–5) raised round or transverse areas between them on each side of mid-ridge; sides with ± 3 raised areas as well as the ridges.
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