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Shrub, 1-10m; young shoots sparsely scaly, with a bloom. Leaves 3-6.5 x 1.3-2.5cm, elliptic to narrowly elliptic, apex acute, upper surface glabrous, lower surface with narrowly rimmed golden or brown scales 5-8× their own diameter apart; petioles glabrous. Flowers 2-6, in a loose terminal inflorescence; calyx minute, usually glabrous; corolla white to rose-pink or lilac, sometimes with red flecks, widely funnel-shaped, (21-)24-27(-30)mm, outer surface usually lacking scales, glabrous; stamens 10; ovary scaly, impressed below the declinate, glabrous style.
Distribution China (N Yunnan, SW Sichuan, Guizhou).
RHS Hardiness H3-4a.
Awards AM 1933 (H. White, Sunningdale Nurseries) as R. eriandrum, from Rock 11288 (USDA 59207); flowers white, slightly pink-flushed. AM 1939 (L. de Rothschild, Exbury) as R. caeruleum, from Rock 11288 (USDA 59207); flowers white, spotted red.
Taxonomic note (incl. R. caeruleum H.Lev. & R. eriandrum H.Lev.)
This species differs from the closely allied R. pleistanthum in its more distant leaf scales and glabrous petioles.