Herba perennis sublignosa; caulis procumbens vel scandens, breviter pubescens; stipulae late deltoideae vel ovatae, obtusae vel subacutae, usque 5 mm latae et 7 mm longae, breviter pubescentes, intus valde costatae; petioli breves, usque 4 cm longi, pubescentes, parte superiore plani vel leviter canaliculati; folia utrinque sparse pubescentia, subtus glandulis paucis aureis ornata; foliolum medium deltoideum vel late rhomboideum usque 4 cm longum et 4 cm latum in apicem acutum vel obtusum sensim coartatum; foliola lateralia similia sed marginibus inferioribus con-spicue gibbosis. Inflorescentia usque 12 cm longa : haud ramosa; pedun-culus et rhachis valde pubescens, sparse flavo-glandulosus; bracteae ovatae, acuminatae, usque 4 mm longae et 2 x 5 mm latae. Flores mediocres; calycis tubus usque 5 mm longus, pubescens, glandulis aureis ornatus, lobi inaequales, 2 superiores deltoideae, connatae, usque 5 mm longi et basi 4-5 mm lati, 2 laterales anguste deltoidei usque 5 mm longi et 1 x 5 mm lati, infimus subulatus usque 9 mm longus et basi 1 x 5 mm latus, petala quam calyx multo longiora, vexillum usque 1 x 4 cm longum et 8 mm latum, glabrum vel minute puberulum, flavum, eleganter purpureo vel brunneo-striatum, basin versus breviter auriculatum, macula purpurea ornatum; alae usque 1 cm longae et 2 mm latae, glabrae, aurantiacae, marginibus in appendices brevissimos productae; carina usque 1 x 4 cm longa et 5 mm lata, glabra, parte inferiori flava, apice purpureo-maculata; filamenta glabra usque 1 x 3 cm longa; antherae ovoideae, flavae, usque 1 mm longae et 0-5 mm latae; stylus glaber, arcuatus, usque 1 x 2 cm longus; stigma capitatum; ovarium breviter sericeo-pubescens, glandulosum, usque 5 mm longum. Legumen acinaciforme, minute et sparse puberulum vel subglabrum, vix glandu-losum, usque 3 cm longum et 8 mm latum, haud inflatum; semina ovoidea compressa, usque 5 mm longa et 4 mm lata, glabra, rufescentia, nigromarmorata.
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Herbaceous climber, up to 1.5 m high. Leaves pinnately trifoliolate, conspicuously stipulate. Leaflets small, widely ovate, rhomboid or deltoid, shortly hairy on veins on undersurface. Stipules widely ovate, blunt. Inflorescence an axillary, several-to many-flowered raceme. Flowers yellow, with purple venation on outside of standard petal. Flowering time Jan.-May. Pod falcate, shortly hairy.