Coarse vines; stems glabrescent to densely ferruginous pilose. Leaves with leaflets broadly elliptic to obovate, 7-16 cm long, 4-11 cm wide, the apex abruptly acute, usually glabrous except the primary veins, reticulate above, sparsely pu-bescent below, chartaceous, obtuse at the base, the laterals oblique, primary lateral veins in ca. 7 pairs; petioles sparsely strigose to pilose, the rachis 2-3 cm long, stipels to 15 mm long; stipules lanceolate, 15-30 mm long, produced to ca. 10 mm below insertion, pilose and ciliate without. Inflorescences to 45 cm long, flowering more than 1/2 the length, the tubercles clavate, the head elongation variable, the inflorescence indumentum ferruginous nigrescent; bracts linear, erect, ca. 8 mm long or longer, caducous; bracteoles broadly ovate to flabellate, 2-3 x 4 mm, caducous; pedicels 2-6 mm long. Flowers with straight buds, ca. 1.5 cm long, calyx tube ca. 7 mm long, carnose, ferruginous-nigrescent pubescent without and within, the upper calyx lobes partially fused, emarginate, ca. 5 mm long, ca. 9 mm wide, the laterals acute, ca. 6 mm long, the lower acute, ca. 7 mm long; standard rotund orbicular, carnose, glabrous, bicallose, to 15 mm long, the auricles semi-orbicular, reflexed, the claw ca. 3 mm long, the wings obliquely oblong to obovate, to ca. 15 mm long, the claw ca. 5 mm long, the keel triangulate, ca. 8 mm long, ca. 9 mm wide distally, auriculate, the claw ca. 5 mm long, the upper margin undulate, culminating in an obtuse beak; stamens 10, the anthers dimorphic, the vexillary anther and the inner, alternate anthers of the staminal sheath imperfect, perfect anthers ca. 1 mm long; ovary stipitate, argenteous vil-lous or bicolored, 3-4-ovulate, the upper style glabrous, ca. 5 mm long, the lower part bulbous. Fruits compressed, oblong, to ca. 10 x 6 x 1-2 cm, pedicel at-tached along the upper suture, straight above, naviculate below, indehiscent, glabrate, the upper suture paralleled by thin wings, the lower margin thin; seeds 2-4(-5), semi-orbicular to oblong, ca. 30 x 25 x 15 mm, hard, dark brown, the hilum encircling ca. 3/4 of testa.
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