Japan Flora: Deciduous shrub or small tree; leaves rhombic-orbicular, broadly ovate or obo¬vate, 4-12 cm. long, 3-8 cm. wide, slightly oblique at the base, deltoid on the upper half, subobtuse3 stellate-pubescent while young, the lateral nerves 6 to 8 pairs, the petioles 5-12 mm. long; calyx-lobes elliptic, reflexed; petals about 2 cm. long, yellow; capsules with persistent calyx-lobes near the base. Mar.-Apr.