Japan Flora: Rather large shrub to 5m. high, rusty-brown pubescent while young, glabrescent, the branches purplish; leaves in 3’s, terminal on the branches, broadly ovate or ovate-orbicular, sometimes broadly rhombic, 3.5- 8 cm. long, 2.5-6 cm. wide, acute, broadly cuneate to rounded at base, the petioles 5-10 mm. long; flowers 1-3, red, terminal, before or with the leaves; corolla 4-5 cm. across; stamens usually 10; styles glabrous or hairy near base; cap-sules shortly ovoid-cylindric, about 1 cm. long, often oblique at base. Apr .-May.

Honshu (s. Kinki Distr.), Shikoku, Kyushu. Korea (Quelpaert Isl.).