Large tendrilled vine, with terete, glabrous stems. Leaves so profoundly bi-lobed as to be 2-foliolate, subchartaceous, glabrous except occasionally strigose below especially on veins, lobes ovate-lanceolate, up to 10 cm. long and 4.5 cm. wide, prominently 5-nerved, rounded basally, bluntly acute or obtuse apically, basal sinus deep and narrow, apical sinus with a subulate apicule at base extending from the lower surface of the petiole and leaflets; petiole slender, glabrous, 3-6 cm. long, callous-rugose at base; stipules caducous. Inflorescence terminal, racemose, glabrous to lightly strigose, up to 10 cm. long or longer, bibracteate at base of pedicels. Flower white, fragrant; calyx large, campanulate, prominently longi-tudinally (15) ridged, 2-2.5 cm. long, with subulate teeth 3-4 mm. long; petals large, obovate, short-clawed, up to 5 cm. long, strigose without and on the claw within; antheriferous stamens 10, in 2 series, about 15 mm. long. Legume sessile, oblong to oblong-obovate, lightly strigose, up to 13 cm. long and 4 cm. wide.
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