An evergreen shrub up to 6 ft high; young shoots very downy. Leaves of stout leathery texture, narrowly oval or oblong, tapered at the base, rather blunt at the apex, 3⁄4 to 2 in. long, 3⁄16 to 1⁄2 in. wide, dull green above, downy on both surfaces, especially on the midrib beneath and on the strongly decurved margins; somewhat scaly beneath; stalk 1⁄8 in. or less long. Flowers opening in April and May usually in pairs from the terminal leaf-axils, each flower on a downy stalk about 1⁄4 in. long, the whole forming a truss 2 or 3 in. wide. Calyx very small, scarcely lobed, very downy. Corolla pale pink to rosy red, 3⁄4 in. long, 1 in. wide, slenderly funnel-shaped at the base, dividing at the top into five oblong lobes; slightly scaly outside, slightly downy inside the tube. Stamens ten, well protruded, their slender stalks downy on the lower half. Ovary scaly and downy; style downy at the base, slender, 1 in. or so long, standing along with the stamens half an inch beyond the corolla. (s. Scabrifolium)
Native of Yunnan and S.W. Szechwan, China, up to altitudes of 11,000 ft; discovered and introduced by Forrest in 1913; first flowered at Caerhays in 1917. Notable characteristics are the soft down which covers shoots, leaves, flower-stalks, and calyx, the protruded stamens and style, and the mixture of scales and down beneath the leaf. It is a pretty rhododendron, evidently hardier than is generally supposed, as it has lived and flowered annually in the open air at Kew since 1923. At the same time it is better suited with milder conditions. It received an Award of Merit when shown from Bodnant April 8, 1931.
R. mollicomum is akin to R. scabrifolium and R. spiciferum, but has narrower flowers and lacks the bristly hairs seen in those two species.