腺柱杜鹃 xian zhu du juan

Rhododendron glandulostylum W. P. Fang & M. Y. He, Bull. Bot. Res., Harbin 2(2): 84. 1982, not Komatsu (1918).

Small shrubs, 1–2 m tall; young shoots densely long dark brown-setose, later subglabrous. Summer and winter leaves different. Petiole 2–4 mm, densely long-setose; leaf blade papery, narrowly elliptic or elliptic-oblong, 2–3.5 × 1–1.4 cm; base cuneate or broadly cuneate; margin slightly revolute, obscurely crenate, ciliate; apex acuminate or mucronate; both surfaces sparsely coarsely strigose at first; abaxial surface later with a few hooklike hairs on midrib; lateral veins prominent on both surfaces. Inflorescence 3–5-flowered. Pedicel ca. 0.5 cm, densely long brown-setose and glandular; calyx lobes trianglar, 3–5 mm, coarsely brown-strigose; corolla funnelform, red or purple-red, ca. 1.2 × 1 cm; tube cylindric, ca. 6 × 4 mm, outer surace shortly glandular-hairy, inner surface pubescent; lobes 0.6–0.8 cm; stamens 5, unequal, up to 1.3 cm, slightly exserted from corolla, filaments flat, puberulent at base; ovary ovoid, 2–3 mm, densely brown-strigose; style 1.2–1.5 cm, shorter than some of the stamens, sparsely setose-strigose below, shortly glandular-hairy above. Fl. May.

Mountain forests; 1200–1700 m. E Guangxi.

This species may be synonymous with Rhododendron subenerve, but is said to differ in the indumentum on the young shoots, etc.