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Shrub or small tree, to 2 m; young shoots glabrous. Leaves in whorls of up to three, at the ends of the branches, 3-5 x 1.5-3.5 cm, rhombic, apex acuminate, lower surface covered with adpressed pilose hairs, eglandular; petioles papillate. Flowers solitary or up to 3, appearing before the leaves; calyx minute; corolla rose-purple (rarely white), open-campanulate, 20-30 mm; stamens 5; ovary glandular, style glabrous. Flowering May-June. Royal Horticultural Society (1997)
Distribution Japan S Honshu
Habitat c.1,000 m
RHS Hardiness Rating H6
Conservation status Least concern (LC)
Allied to R. decandrum (q.v.). Only the type form is in cultivation. Royal Horticultural Society (1997)