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Upright shrub, 1-3 m; young shoots setose. Leaves 5.5-11.5 x 1.5-3 cm, oblanceolate, margin not setose, upper surface bristly (in the type specimen), midrib impressed; lower surface glaucous, the scales unequal, brown, 2-6 x their own diameter apart. Flowers c.3, in a loose terminal inflorescence; calyx lobes 4-5 mm, ciliate; corolla white, without or with a faint yellow basal blotch, tubular-funnel-shaped, c.75 mm, outer surface scaly, pubescent towards base; stamens 10; ovary densely scaly, tapering into the style that is scaly below. Flowering April-May. Royal Horticultural Society (1997)
Distribution India Arunachal Pradesh
Habitat 1,650 m
RHS Hardiness Rating H3
Conservation status Critically endangered (CR)
This species may be a variant of R. formosum but is distinguished by the larger calyx, etc. There is some doubt about the status of cultivated plants as the leaves are significantly less setose than those of the type specimen. Royal Horticultural Society (1997)