Japan Flora: Semi-evergreen or deciduous, red-brown strigose, much-branched shrub to 1 m. high; leaves often clustered 的ward the tip of the branchlets, rather thick, lanceolate to broadly so, 2-3.5 cm. long, 5-8 (-10) mm. wide, acute, mucronate, acuminate at base, the petioles 1-3 mm. long; flowers 1 or rarely 2, usually red, following the new leaves, the pedicels about 1 cm. long; calyx-lobes 5, ovate-orbicular; corolla 25-3.5 cm. across, broadly infundibuliform, glabrous, 5-lobed, spotted inside on upper lobes; stamens 5, the filaments granular-pilose on lower half, the anthers dark purple; styles glabrous, 3-5 cm. long; capsules ovoid, hairy, 7-8 mm. long. June-Aug. Rocks in ravines;

Honshu (w. Kanto Distr. and westw.), Kyushu. Widely cultivated with numerous cultivars grown in gardens; also extensively used as a parent of hybrids.