隐脉杜鹃(原亚种) yin mai du juan (yuan ya zhong)

Rhododendron brachysiphon I. B. Balfour ex Hutchinson; R. brevitubum I. B. Balfour & R. E. Cooper (1917), not J. J. Smith (1914); R. calophyllum Nuttall; R. jenkinsii Nuttall; R. macranthum Griffith (1848), not (Bunge) D. Don (1834); R. maddenii var. longiflorum W. Watson; R. polyandrum Hutchinson.

Leaf blade lanceolate, oblanceolate, or elliptic, 2–4 cm wide. Filaments usually glabrous. Capsule ovoid, 10–20 × ca. 10 mm.

Forests, scrub, river valleys; ca. 2600 m. S Xizang [Bhutan, NE India, Sikkim].