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Shrub or small tree; young shoots glabrous. Leaves in whorls of up to three, at the ends of the branches, 3-5 x 2.5-3cm, rhombic, apex acuminate, lower surface sparsely covered with brown simple hairs, at least when young, midrib glabrous or shortly pilose; petioles glabrous or with scattered brown hairs near base of lamina. Flowers 1-2 per inflorescence, appearing before the leaves; calyx minute; corolla purple, open-campanulate, 20-30mm; stamens 10; ovary densely and stiffly hairy, style glabrous.
Distribution Japan (E Honshu).
Habitat c. 650m.
RHS Hardiness H4a-b.
This species is probably allied to R. maybarae and R. nudipes but differs in the shape of the leaf apex.