Scrambler or climber, c. 6 m long. Branches terete, c. 2.5 mm ø, sulcate, glabrous. Leaves chartaceous, triangular or deltoid in outline, 5-8 by 4.5-6 cm; apex short-acuminate or acute; base shallowly cordate, sinus broad, up to c. 1 cm deep; glabrous above, minutely hairy beneath; basal nerves 2 pairs, slightly elevated beneath, distinct above; inner pair ascending to the apex, outer pair much shorter, up to c. ⅓ of the blade; veins reticulate beneath, rather faint above; petiole 1.5-2.5 cm, glabrous. Inflorescences in the axils of leaves, fasciculate, rachides condensed, very short, usually 2-3 mm long, sometimes one of the branches up to 10 (-15) mm, glabrous; bracts minute, triangular or deltoid, c. 1 mm long, glabrous. Pedicel and ovary 15-30 mm, glabrous. Perianth oblique or slightly curved, venation distinct, glabrous outisde, with a distinct stipe (c. 2.5 mm) slightly expanded at base; utricle subglobose, c. 6 mm ø, sparsely hairy inside, with 2 glandular, elliptic bodies (c. 2 mm long); tube c. 17 by 2 mm, with scattered, glandular hairs inside; limb 1-lipped, oblong, c. 20 by 10 mm, obtuse or slightly mucronulate, margin reflexed, with scattered, glandular hairs on the inner surface, glabrescent. Stamens 6; anthers oblong, c. 0.7 mm long. Gynostemium c. 2.5 mm long; style 6-lobed; lobes triangular, c. 0.5 mm long, basal parts united and extended outward as an annular ring. Capsules glabrous, broad-ellipsoid or sub-globose, 2.5 by 1.7-2.5 cm, 6-ribbed or 6-angular, obtuse. Seeds winged, triangular, c. 6 by 5 mm (incl. c. 1 mm wide wing), seed proper with wart-like granules densely covered beneath, sparsely above, funicle obscure.
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