Ohwi 1985 Flora of Japan

Japan Flora: Tree; leaves ovate to broadly so, 6-11 cm. long, 4-6 cm. wide, the pedicek stout, 1.5-4.5 cm. long; fruit globose to ovoid-globose, 2-3.3 cm. across, 5-locular, obtuse at base or with depressed ends, green, the lenticels brown, minute, very numerous, the persistent calyx-lobes linear-Ianceo- late to lanceolate. Apr. Honshu (n. distr.).