Rhododendron trichostomum Franch.

Rhododendron hedyosmum I. B. Balfour (Notes Roy. Bot. Gard. Edinburgh 9: 234. 1916) was described from cultivated material derived from seed collected in Sichuan. Known only in cultivation, it is a large-flowered variant, and probably a hybrid, of R. trichostomum.

Small, intricately branched shrubs, 0.3–1(–1.5) m tall; branchlets twiggy, densely scaly, setose; bud scales deciduous, rarely persistent. Petiole 2–4 mm, scaly; leaf blade aromatic, linear, linear-lanceolate, oblong or oblanceolate, 0.8–3.2 × 0.3–0.5(–0.8) cm; base rounded to tapering; margin revolute; apex acute or obtuse, mucronate or emarginate; abaxial surface scales overlapping, pale yellowish brown to brown, arranged in 2–3 tiers, the lowermost tier golden, paler than others, rarely somewhat; adaxial surface dark green, scaly or not. Inflorescence 6–10(–20)-flowered. Pedicel (0.1–)0.2–0.5 cm, scaly; calyx lobes 0.5–2(–3) mm, oblong to ovate, persistent, scaly or not, margin usually scaly, ciliate; corolla narrowly tubular, white, pink or rose, 0.8–1.6(–2) cm, tube 4.5–8(–12) mm, outer surface densely scaly or not scaly, throat densely pilose; lobes with a few scales but no hairs; stamens 5, included in corolla tube, filaments glabrous; ovary ca. 1 mm, scaly; style turbinate, shorter than or equal to ovary. Capsule ovate to cylindric, 3–5 mm, densely scaly. Fl. May–Jul, fr. Aug–Sep.

S Qinghai, W Sichuan, SE Xizang, NW Yunnan.

Forests, thickets, scrub, rocky alpine meadows, open slopes, rocks; 2700–4600 m.

Rhododendron trichostomum (毛嘴杜鹃) is a rhododendron species native to southwestern China, where it grows at altitudes of 2,700–4,600 m (8,900–15,100 ft). It is an evergreen shrub that grows to 30–100 cm (12–39 in) in height, with leaves that are linear, linear-lanceolate, oblong, or oblanceolate, 0.8–3.2 by 0.3–0.5 cm in size. The flowers are pink or white.

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

Rhododendron trichostomum là một loài thực vật có hoa trong họ Thạch nam. Loài này được Franch. miêu tả khoa học đầu tiên năm 1895.

毛嘴杜鹃（学名：Rhododendron trichostomum），为杜鹃花科杜鹃属下的一个植物变种。