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Shrub, to 2m; young shoots with persistent setae. Leaves 7-8 x 2.5-3cm, narrowly obovate, apex bluntly acute, margin with or without bristles, upper surface with impressed midrib, lower surface brown, with dense, but not touching, scales. Flowers (2-)3-4, in a loose terminal inflorescence, scented; calyx lobes 1-2mm, usually fringed with setae; corolla white, funnel-campanulate, 45-60mm, outer surface scaly throughout; stamens 10; ovary densely scaly, tapering into the style which is scaly below.
Distribution China (Guizhou), Vietnam, Laos.
RHS Hardiness H1b-2.
This species, which is rare in cultivation, is allied to R. ciliicalyx and to R. roseatum, but differs in the more persistent setae on the young stems.