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Standard 0.8–1.5 × 1–1.5 cm, subcircular, emarginate at the apex, auriculate at the base; wings 8–10 × 3–5 mm, blade ovate, constricted at the base with a basal appendage to 3 mm long; keel 9 × 4 mm, trapeziform.
Inflorescence an axillary pseudoraceme; peduncle 1–4.5 cm long, glabrous; rhachis 4–8 mm long; bracts up to 2 mm long, lanceolate, caducous; pedicel 3–7 mm long; bracteoles up to 7 mm long, oblong-lanceolate.
Calyx 5-lobed, glabrous; tube 3–4 mm long; lobes 1–2.5 mm long, triangular, save for middle lower lobe which is up to 4 mm long and narrowly lanceolate.
Ovary 5–10 mm long, narrowly cylindrical, obscurely 4-winged, glabrous or sparsely hairy; stigma terminal, penicillate.
Slender climbing herb to 1 m long.
Corolla blue or yellow, glabrous.
Pod known only in immature form.
Seeds not known.
Stems glabrous.
