Herbaceous, 1-15 m., scandent to erect. Stem slender, little branched, ribbed and glabrous, the internodes of the main axis 5.5-14 cm. long. Leaves pinnately veined, asymmetric, somewhat denticulate, obliquely elliptic, abruptly acuminate, the broader half usually produced into a conspicuous lobe at base, 8.5-15 cm. long, 4-7.5 cm. wide, petioles 12-40 mm. long, stipules membranaceous, obliquely elliptic, entire, acute and apiculate, truncate at base, 25 mm. long, 7 mm. wide. Peduncles 3-8 cm. long. Cymes regular, multi-flowered. Bracts early deciduous. Pedicels 6-16 mm. long. Tepals entire, white or pinkish, the staminate 2 (rarely 3 or 4), orbicular, cordate at base, 4-8 mm. long, the inner, when present, elliptic, 1-3.5 mm. long. Stamens numerous, anthers oblong-elliptic, usually equal to or longer than the filaments, connective produced, obtuse. Pistillate bracteoles soon deciduous, entire, elliptic, obtuse. Pistillate tepals 2 (rarely 3), orbicular to rounded-ovate, 6-9 mm. long, the third, when present, smaller. Styles 3, bifid. Placentae bilamellate, ovuliferous throughout. Capsule ellipsoid, 3-winged, the largest wing obtuse, 7-12 mm. broad.
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