Japan Flora: Plants glabrous; stems elongate, branched; leaves thin, cordate or deltoid-cordate, 5-12 cm. long, 5-10 cm. wide, acuminate, entire; inflorescence 的me- what elongate, erect, the staminate often branched; staminate flowers yellowish green, short-pedicelled, the pistillate pendulous; tepals minutely toothed on upper margin, flat, spreading; capsules broadly obovate-elliptic, about 15 mm. long; seeds with a broad wing on one side. July-Aug. Thickets in lowlands to the foothills;

Hokkaido, Honshu, Shikoku, Kyushu; common.