Climber to 5 m., ± herbaceous; stems pale, slender, striate, very minutely rugulose, glabrous; tendrils present, simple.. Leaves ovate, 4–10 cm. long, 2.5–7.5 cm. wide, shortly acuminate at the apex, cordate at the base, margin thin and yellowish in dry state, dentate with narrow subulate teeth, glabrous, thin, with obvious rhaphides when viewed by transmitted light; petiole 1.5–6.5 cm. long; stipules narrowly oblong, ± 4 mm. long, 1 mm. wide, ± obtuse at apex, cordate and ± produced at base, brownish scarious.. Inflorescences leaf-opposed cymes of umbelliform cymules, 4–7 cm. long; peduncle 3 cm. long; pedicels 5–7 mm. long, glabrous or very obscurely scurfy; all axes glabrous or with minute emergences; bracts and bracteoles ± triangular, 1 mm. long, brownish-scarious.. Buds ovoid or ellipsoid, 2.5–3 mm. long, obtuse, glabrous.. Calyx shallow, 2 mm. wide, entire, glabrous.. Petals yellowish white or yellow, glabrous.. Fruits unknown.
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