Climbers, summer annual. Stem ca. 2 m, branched, thin, narrowly winged-ridged. Leaves slightly reflexed on a zigzag stem; petiole 1-2 cm; leaf blade glaucous abaxially, green adaxially, oblong-ovate in outline, 4-6 cm (tendril excepted), with 4 or 5 alternate stalked pinnae; rachis terminating in a long thin branched cirrose tendril; primary leaflets twice ternate; ultimate leaflets narrowly ovate, 4-12 × 2-5 mm, base cuneate, margin entire, apex subacute or obtuse. Inflorescence 2-5-flowered; peduncle 2-4 cm; bracts linear-oblanceolate, 5-8 × 0.5-1 mm, irregularly lacerate. Pedicel 7-12 mm. Sepals ca. 6 × 2 mm, narrower at apex, with long teeth, except in upper 1/3, often arcuately reflexed. Corolla 13-14 × 5-5.5 mm; outer petals distinctly mucronate at apex, with comparatively well-developed basal pouches (sinus at petal insertion ca. 2 mm deep); blade of inner petals ca. 1/3 as long as petal, with dorsal crest prolonged beyond apex proper 1-1.5 mm; nectary rather thick, subsigmoidally curved with pointed tip. Capsule green, oblong, 25-33 × 3-4 mm including short style, not constricted between seeds, 10-12-seeded; replum persistent. Seeds black, shiny, smooth, round in profile, slightly flattened with obtuse back, ca. 2 mm; elaiosome small. Fl. and fr. Aug.
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