Climbers, herbaceous. Stems 2-4 m, sulcate, thicker than in any other species (2-4 mm in diam.), branched and leafy throughout. Petiole 1-4 cm; leaf blade glaucous abaxially, green adaxially, with usually 2 pairs of opposite leaflets; rachis ending in a thin branched cirrose tendril; primary leaflets twice ternately compound; ultimate leaflets ovate to broadly lanceolate, 6-25 × 4-15 mm, margin entire, apex obtuse with small scabrid mucro. Raceme ca. 1 cm, 2-10-flowered, nutant; peduncle 2-4 cm; bracts linear, ca. 5 × 1 mm, margin entire or slightly dentate, apex acute. Pedicel 7-15 mm, thin. Sepals ovate-lanceolate, 2-3 × ca. 1 mm, entire. Corolla yellow, oblong-cordate in profile, 18-20 × 8-10 mm; outer petals saccate; sinus at petiole insertion narrow, 3-4 mm deep; dorsal crest of inner petals overtopping petal apex ca. 2 mm; nectary curved, thickened at apex, 3-4 mm. Ovary with 50-60 ovules; stigma slightly broader than long, slightly notched at apex, with small papillae in forward corners and more prominent rounded papillae in basal corners. Capsule oblong, 27-35 × ca. 4 mm, tipped by permanent style 6-7 mm; replum persistent with very prominent spongy knotty placenta. Seeds black, 1.7-2 mm, tuberculate, with small elaiosome. Fl. Jul-Aug, fr. Jul-Dec.
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