Japan Flora: Herbaceous perennial, 1-2m. high, erect while young, becoming somewhat scandent; leaves relatively thin and membranous, ovate-oblong to nearly ovate, 5-15 cm. long, 25-7 cm. wide, 5- to 7-nerved, abruptly acute to acuminate, rounded to subtruncate at base, vivid green above, glaucescent and usually with papillae beneath, the petioles 1~4 cm. long, the upper ones with subtending tendrils; inflorescence simple, many-flowered, the peduncles in lower stem axils, 4-10 cm. long, the staminate tepals spreading, broadly oblanceolate, about 4 mm. long; stamens 1/2-2/3 as long as the tepals, the anthers ab이it 0.7 mm. long; pistillate tepals nearly boat-shaped, appressed to the ovary; fruit globose, black, bloomy. May-June. Meadows and thickets in mountains;

Honshu, Shikoku, Kyushu. Formosa, and a variety in Korea and China.