短蕊杜鹃 duan rui du juan

Rhododendron gymnocarpum I. B. Balfour ex Tagg; R. perulatum I. B. Balfour & Forrest.

Dwarf shrubs 0.6–1.6 m tall; young shoots stout, usually ca. 4 mm in diam., whitish tomentose. Petiole stout, 5–8(–10) mm, glabrescent; leaf blade leathery, lanceolate to oblanceolate, 4–8 × 1.5–2 cm; base cuneate to rounded; margin revolute; apex acuminate, apiculate; abaxial surface indumentum densely felted, cinnamon to buff, hairs rosulate; adaxial surface dark green, glabrous; midrib grooved adaxially; lateral veins 12–15-paired, impressed adaxially. Inflorescence 3–6-flowered; rachis ca. 5 mm, tomentose. Pedicel 1–2 cm, floccose and glandular-hairy; calyx lobes 5, ca. 2 mm, sparsely floccose; corolla open-campanulate, fleshy, rose to deep crimson, sometimes with faint flecks, 2.7–3 cm, glabrescent inside; lobes 5, suborbicular, 1.2–1.3 × 1.5–2 cm, margin crenate; stamens 10, 0.8–1.4 cm, filaments puberulent at base; ovary short, ca. 3 mm, floccose and glandular; style short, ca. 0.5 cm, glabrous. Capsule not known. Fl. Jul.

Pinus forests, alpine thickets; 3300–4300 m. SE Xizang, NW Yunnan.