Japan Flora: Large glabrous shrub; branches angled, with scattered spines 2-20 mm. long; leaves chartaceous, narrowly ovate, 3-8 cm. long, 1.5-3.5 cm. wide, acute with an emarginate tip, obtuse to broadly cuneate at base, entire, the petioles 5-12 mm. long, narrowly winged; flowers solitary or in pairs, terminal and axillary, the pedicels about 5 mm. long; calyx cup-shaped, the lobes depressed 3- angular; petals 5, ascending, white, narrowly obovate-oblong, about 12 mm. long, acute; stamens about 20; fruit depressed- globose, yellow when mature, 2-25 cm. across. June.
Honshu (Izu, Kii, and Nagato Prov.), Shikoku, Kyushu. Korea (Quelpaert Isl.), Ryukyus, and Formosa.