Woody climbers. Branches hispid with ferruginous hairs. Stipules dorsifixed, sagittate, ca. 2.2 cm × 8 mm, striate; petiole 10-20 cm, sparsely hispid with ferruginous hairs; stipels linear-lanceolate, slightly longer than petiolules, striate; terminal leaflet broadly ovate, 10-15 × 6.5-12 cm, sparsely pubescent on both surfaces, lateral veins 6-8 pairs, conspicuous on both surfaces, base rounded, margin crenate, apex caudate-acuminate, mucronate or acute when young; lateral leaflets smaller, oblique. Inflorescences paniculate, very dense before flowering, ca. 22 cm, branches ca. 10 cm. Bracts lanceolate or linear-lanceolate, ca. 1.3 cm, longer than flower bud, ferruginous hispid; bracteoles ca. 5.5 mm. Pedicels ca. 5 mm. Calyx puberulent and ferruginous pilose; tube ca. 3 mm; lobes lanceolate, 4-6 mm, upper 2 connate. Standard white, suborbicular, ca. 1 cm in diam., emarginate, with yellow spot at base, with incurved auricles and callosities, claw ca. 2.5 mm; wings oblong, longer than keel, with long appendage; keel purple, ca. 1 cm, obtuse. Vexillary stamen free at base. Ovary sessile, ca. 7 mm, sparsely villous.
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