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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 2.5-3 cm, 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, 20-30 mm; stamens 10; ovary densely and stiffly hairy, style glabrous. Royal Horticultural Society (1997)
Distribution Japan E Honshu
Habitat c. 650 m
RHS Hardiness Rating H6
Conservation status Vulnerable (VU)
This species is probably allied to R. maybarae and R. nudipes but differs in the shape of the leaf apex. Royal Horticultural Society (1997)