Rhododendron preptum I. B. Balf. & Forrest

Rhododendron preptum is a doubtful species and may be a hybrid of R. arizelum and/or R. coriaceum. It is known only from two wild-collected specimens.

Shrubs or small trees, 5–7 m tall; older branches glabrous; branchlets stout, usually 8–10 mm in diam.; young shoots grayish to brownish tomentose. Petiole terete, 15–20 mm, tomentose, glabrescent; leaf blade leathery, obovate-elliptic, 11–16 × 4–7 cm; base cuneate; apex obtuse or rounded, apiculate; abaxial surface with pale brown, 2-layered indumentum, upper layer of cup-shaped slightly fimbriate hairs, lower layer thin, compacted; adaxial surface glabrous; midrib prominent abaxially, grooved adaxially; lateral veins 13–15-paired, prominent abaxially. Inflorescence ca. 20-flowered; rachis stout, ca. 20 mm, slightly tomentose. Pedicel ca. 2 cm, brown-tomentose; calyx saucer-shaped; teeth short, ca. 1 mm, with similar hairs; corolla obliquely campanulate, white (in cultivation) or perhaps creamy-white, with crimson basal blotch, ca. 3.5 cm, lobes 8, orbicular, ca. 1 × 1.5 cm; stamens 16, 1.5–2.5 cm, filaments pubescent at base; ovary conoid, ca. 7 mm, densely brown-tomentose; style ca. 2.5 cm, glabrous, stigma swollen. Capsule not known. Fl. May.

SW Yunnan [NE Myanmar].

Mixed forests, Rhododendron thickets; 3200–3300 m.

Rhododendron preptum adalah spesies tumbuhan yang tergolong ke dalam famili Ericaceae. Spesies ini juga merupakan bagian dari ordo Ericales. Spesies Rhododendron preptum sendiri merupakan bagian dari genus Rhododendron.

Rhododendron preptum là một loài thực vật có hoa trong họ Thạch nam. Loài này được Balf. f. & Forrest miêu tả khoa học đầu tiên năm 1920.

复毛杜鹃（学名：Rhododendron preptum）为杜鹃花科杜鹃属下的一个种。