Scrambling annual; stems moderately hairy, angled, winged. Lvs sparsely to moderately hairy; tendril branched; leaflets in 1 pair, ovate to elliptic, acute, 25-60 mm long; veins only weakly or not parallel; stipules ovate-lanceolate with 1 basal lobe, > 1/2 as wide as stem, 8-20 mm long. Infl. much > lvs, 1-3-flowered; pedicels 6-8 mm long. Calyx hairy, slightly gibbous at base; calyx teeth ± equal, triangular, ± = or > tube. Corolla mauve to purple, pink to deep red, blue or white, 25-35 mm long. Pod densely hairy, light brown, 4-10-seeded, 50-70 mm long; seeds reddish brown, finely reticulate-rugose; hilum c. ⅙ of circumference.