Japan Flora: Root fleshy, cylindric, elongate, perpendicular; stems elongate, branched; leaves opposite, sometimes alternate, cordate at base, long-petioled5 narrowly oblong-deltoid, 5-10 cm. long, 2-5 cm. wide, long-acuminate, green, glabrous; inflorescence 1- to 3-nate in leaf axils, spicate, short-peduncled; flowers white, the pistillate pendulous, loosely few-flowered, the staminate erect, rather loosely many-flowered, sessile; stamens 6; capsules broadly elliptic, 1.2-1.4 cm. long, about 2 cm. wide; seeds broadly wing-margined. Aug. Wooded foothills;

Honshu, Shikoku, Kyushu.