Japan Flora: Stems or branches to 10 m. or more long; leaves suborbicular to broadly ovate, 5-12 cm. long and as much wide, abruptly short-acuminate, rounded to cordate, coarsely acute-toothed, glabrous above, glaucous and with tufts of axillary hairs or glabrous beneath, the petioles 3-10 cm. long; inflorescence rather large, densely many-flowered, the enlarged neutral calyx-lobes deltoid-ovate, 2-3 cm. long; petals of bi­sexual flowers narrowly ovate, about 2 mm. long, caducous; capsules 6-8 mm. long inclusive of a rather elongate style, longitudinally ribbed.    June-July. Woods and thickets in mountains.

Hokkaido, Honshu, Shikoku, Kyushu; rather common.

var. concolor Hatus. Leaves green and lustrous on both sides. Kyushu.