树枫杜鹃 shu feng du juan

Rhododendron valentinianum Forrest ex Hutchinson var. changii W. P. Fang, Contr. Biol. Lab. Chin. Assoc. Advancem. Sci., Sect. Bot. 12: 71. 1939.

Shrubs, 1–1.5 m tall; branches cylindric; young shoots tinged with purple, thinly hispid. Petiole ca. 3 mm or nearly sessile, scaly, hispid; leaf blade leathery, oblong-elliptic or early oblong, 3–4.5(–5.5) × 2–2.5(–3) cm; apex and base rounded; abaxial surface pale green, scales nearly contiguous; adaxial surface deep green, without scales; lateral veins inconspicuous on both surfaces. Inflorescence terminal, cymose, (2-)3- or 4-flowered. Pedicel 0.5–0.8 cm, scaly, without hairs; calyx lobes ca. 10 mm, oblong-ovate, scaly; corolla funnelform-campanulate, deep yellow, 3.5–4 cm, tube 18–20 mm, outer surface scaly on lobes; lobes ± rounded, 1.5–2 cm; stamens 10, as long as or slightly shorter than corolla; filaments white-pubescent in lower 2/3; ovary 5-locular, densely scaly; style 4–4.5 cm, glabrous. Capsule cylindric-ovoid, 12–15 mm.

Thickets; 1600–2000 m. Chongqing.

Rhododendron changii is very close to R. valentinianum.