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Shrub, 1-2.5m; young shoots floccose-tomentose; bud scales persistent. Leaves 7-18 x 1-2.5cm, narrowly lanceolate, apex acute, upper surface glabrous, lower surface with a thick white to fulvous tomentum composed of dendroid hairs; petioles tomentose at first, usually soon glabrescent. Flowers 5-10, in a tight truss; calyx 2-5mm; corolla 5-lobed, pale rose, with or without flecks, funnel-campanulate, nectar pouches lacking, 30-40mm; ovary densely whitish to brown-tomentose, style glabrous.
Distribution C Japan (Honshu).
Habitat to 2,000m.
RHS Hardiness H4b.
Awards AGM 1993
Taxonomic note (R. yakushimanum Nakai subsp. makinoi (Tagg) D.F.Chamb.)
Allied to R. degronianum but differing in the persistent bud scales and narrower leaves, 7.5-10× as long as broad.