陕西杜鹃 shan xi du juan

Small, much-branched prostrate shrubs, 0.2–0.3 m tall; branches with dense ferruginous-black flaky scales. Petiole 0.8–1 mm, scaly; leaf blade broadly elliptic or oblong, 1–2.5 × 0.5–1 cm; base obtuse; apex rounded, mucronate; abaxial surface grayish yellow-brown, scales slightly contiguous, 2-colored, pale yellow and russet brown, nearly equal in number and intermixed; adaxial surface dark green, scales nearly contiguous, ruby red, shiny. Inflorescence 2-flowered. Pedicel ca. 0.2 cm, scaly; calyx lobes 3.5–4 mm, oblong, scales forming a dense central band, margin long-ciliate; corolla funnelform, pale purple, ca. 1.6 cm, tube 4–5 mm, throat pubescent; stamens 10, shorter than corolla, varying, filaments villous in lower part; ovary 2–3 mm, sparsely scaly; style 1.4–2 cm, longer than corolla, glabrous. Capsule ovoid, 3–4 mm, scaly. Fl. Jul–Aug, fr. Aug–Sep.

Forest margins, open alpine slopes; ca. 3000 m. C Shaanxi.