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Tree, to 5 m; young shoots becoming glabrous. Leaves in whorls of up to three, at the ends of the branches, 3-8 x 2.5-6 cm, broadly rhombic, apex acuminate, lower surface glabrous except for a few hairs persisting on the midrib; petioles densely covered with red-brown hairs. Pedicels densely pilose. Flowers 3-4 per inflorescence, appearing before the leaves; calyx minute; corolla rose-pink (rarely white), with darker flecks on upper lobe, funnel-campanulate, 25-35 mm; stamens 10; ovary densely pilose, style pilose in lower half. Flowering May-June. Royal Horticultural Society (1997)
Distribution Japan Hondo
Habitat 300-500 m
RHS Hardiness Rating H6
Conservation status Endangered (EN)
This species is closely allied to R. amagianum (q.v.). Royal Horticultural Society (1997)