Rhododendron pachysanthum Hayata

Li et al. (in T. C. Huang, Fl. Taiwan, ed. 2, 4: 31. 1998) considered that Rhododendron pachysanthum and the synonyms cited above are synonymous with R. hyperythrum. See also the comment under R. hyperythrum below.

Shrubs; young shoots tomentose. Petiole ca. 15 mm, tomentose; leaf blade leathery, oblong-elliptic, 6–9 × 2.5–3.5 cm; base rounded; apex acute, apiculate; abaxial surface persistently pale white-brown to rufous tomentose, sometimes only on the midrib, hairs branched; adaxial surface rugose or smooth, glabrous. Inflorescence 10–20-flowered; rachis 10–20 mm. Pedicel ca. 2.5 cm, glandular-pubescent; calyx lobes ca. 1 mm, rounded, glandular especially on margin; corolla widely campanulate, white to pale pink, with or without flecks, ca. 4 cm; ovary densely glandular-hairy; style glabrous. Capsule ca. 15 × 5 mm.

Forests. Taiwan.