Japan Flora: Sparsely and coarsely hairy; leaves rather thinly membranous, oblong to broadly lanceolate, 10-15 cm. long, 3-5 (-7) cm. wide, short-toothed, acuminate, paler beneath, the petioles 5-30 mm. long, winged above; inflorescence terminal, several-flowered, the pedicels slender; calyx in neutral flowers shallowly 3- to 5-lobed, the calyx-lobes in bisexual flowers 4-7 mm. long; petals about 10 mm. long; capsules 5-8 mm. long; styles persistent, 7-8 mm. long. July-Aug.

Honshu (Totomi, Yamato, and Kii Prov.), Shikoku, Kyushu.