Japan Flora: Gla­brous, somewhat sprawly shrub; internodes hollow, the nodes with solid pith; leaves simple or ternately compound, ovate to broadly so, or elliptic-ovate, 4-8 cm. long, 3-5 cm. wide, acute, rounded to broadly cuneate at base, acutely toothed ex­cept at base, deep green, pale yellow-green beneath, the petioles 1-1.5 cm. long; flowers solitary from a lateral bud, the pedicels 1-1.5 cm. long, usually longer than the bud-scales; calyx-lobes oblong, 6-7 nun. long, ciliate; corolla about 2.5 cm. across, the lobes obovate-elliptic, about 1.5 cm. long, 8-10 mm. wide; fruit ovoid, about 1.5 cm. long, with scattered warty lenticels. Mar.-Apr.

Chinese shrub much cultivated in Japan.