An evergreen shrub of bushy form, ultimately 4 to 6 ft high; branches slender, scaly, and slightly downy when young. Leaves narrowly oval or oblanceolate, tapering at both ends, 3⁄4 to 11⁄2 in. long, 1⁄4 to 1⁄2 in. wide, glabrous above, very scaly beneath; stalk 1⁄8 in. or less long. Flowers dull white, 1⁄3 to 1⁄2 in. across, numerous and densely packed in a short, terminal, rounded raceme 11⁄4 to 11⁄2 in. across, on slender, scaly stalks up to 3⁄4 in. long. Calyx with linear lobes 1⁄16 in. long. Corolla bell-shaped at the base, with five flatly spreading, oval lobes as long as the tube; stamens ten, longer than the corolla, not downy. Style shorter than the stamens, glabrous. Bot. Mag., t. 8198. (s. Micranthum)
Native of North and Central China, and of Korea; first collected by the French missionary d'lncarville in the middle of the 18th century in the mountains north of Peking and described in 1837 from a later collecting in the same area; apparently not introduced to Britain until Wilson sent seeds to Messrs Veitch from W. Hupeh in 1901. According to him it is a rare plant in Hupeh, growing in cliffs at 5,000 to 6,000 ft and favouring 'fully exposed and windswept rocky places'. It is remarkably distinct in its racemes of small, numerous flowers, which open in May, and give the plant at that time a strong resemblance to Ledum groenlandicum. Still, it is not in the front rank of rhododendrons.