Japan Flora: Large deciduous rusty-brown pubescent shrub to 5 m. high; leaves usually in 3’s, terminal on the branchlets，broadly rhombic to broadly ovate-rhombic, 4-8 cm. long, 3-6 cm. wide, slightly lustrous and long rusty-brown hairy on upper side, paler and the midrib long-hairy beneath, abruptly acute at both ends or obtuse at base, the petioles 5-10 mm. long; flowers 3-4, deep rose, in umbels, terminal, the pedicels 5-8 mm. long; calyx-teeth small, obsolete; corolla glabrous; stamens 10, the anthers purple-brown; styles glabrous; capsules ovoid-cylindric, 1- 1.5 cm. long, oblique at base, densely brown-pubescent. May-June. Mountains;

Honshu (Tokaido to s. Kinki Distr.).