Japan Flora: Nearly glabrous perennial with long creeping rhizomes; stems 40-80 cm. long; leaves broadly ovate, 5-12 cm. long, 3.5-9 cm. wide, acute to obtuse, rounded to broadly cuneate at base, scattered incised-toothed and short-pilose on margin, petiolate; flowers solitary, the pedi­cels 3-4 cm. long; calyx short-tubular, 5-6 mm. long at anthe­sis, sub truncate at the base, deeply 5-lobed, the lobes narrowly deltoid, obtuse, short-ciliate; corolla creamy, subrotate; fruit globose, red, about 1.5 cm. across, enclosed by the finely veined bladdery red calyx about 4-5 cm. long. June-Aug. 

Hokkaido, Honshu, Shikoku, Kyushu. Korea, n. China. The typical phase occurs in Europe and w. Asia.

f. monstrosa Miq. An abnormal sterile phase; spike pendulous, many-bracteate but without flowers. Cultivated.