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Shrub or small tree; young shoots soon glabrous. Leaves in whorls of up to three, at the ends of the branches, 2-3(-6) x 2-4 cm, broadly rhombic, apex acuminate, lower surface with glands, especially on midrib and veins; petioles sparsely glandular, also with villose hairs. Pedicels villose, densely so at base, also glandular. Flowers solitary or up to 3 per inflorescence, appearing before the leaves; calyx minute; corolla magenta, with flecks, open-funnel-campanulate, 25-28 mm; stamens 10; ovary glandular, with a few villose hairs, style glabrous. Flowering April-May. Royal Horticultural Society (1997)
Distribution Japan Honshu, Shikoku
Habitat c.800 m
RHS Hardiness Rating H6
Conservation status Least concern (LC)
Distinguished from the apparently allied R. dilatatum by the presence of 10 stamens. Royal Horticultural Society (1997)