Tendriled liana, glabrate in age (juveniles with pubescent midribs); stems ribbed; tendrils bifid. Leaves biternate; stipules minute, ovate; petioles, rachises, and petiolules ribbed to narrowly winged; leaflets +/- elliptic to lanceolate, obtuse to acuminate, acute at base, 4-8.5 cm long, 1.5-3 cm wide, usually dentate above middle, ciliate when juvenile, with distinct, irregular black lines on lower surface (sometimes inconspicuous when fresh). Thyrses small, either racemose and solitary in leaf axils and on tendrils or paniculate, open, and terminal; flowers white, ca 3 mm long; sepals densely tomentose outside; petals each subtended by a broad green gland, the scales of the anterior petals yellow, bilobed at apex, held in front of and slightly below the cluster of stamens; stamens 7-9; filaments pubescent; ovary tomentose. Fruits ovate-cordate, ca 2.5 cm long, constricted below the cell, the cells blackened and whitish-hirtellous on inner margin, conspicuously marked with irregular black lines. Croat 4673, 7685.