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FOC | Family List | FOC Vol. 14 | Apiaceae | Rhododendron

399. Rhododendron tsariense Cowan, Notes Roy. Bot. Gard. Edinburgh. 19: 232. 1937.

白钟杜鹃 bai zhong du juan

Shrubs, 1–3 m tall; young shoots densely pale yellow woolly-tomentose. Leaf blade thickly leathery, elliptic-oblong to obovate, 2.2–6.2 × 1–3 cm; base rounded or subcordate; margin slightly revolute; apex obtuse or shortly acuminate; abaxial surface densely rufous woolly, hairs branched; adaxial surface slightly rugulose, glabrous except for ± tomentose groove of midrib, midrib and lateral veins prominent abaxially. Inflorescence racemose-umbellate, 3–5-flowered; rachis 3–4 mm. Pedicel ca. 1 cm, densely tomentose; calyx 1–2 mm, tomentose; corolla campanulate, white or pink, with red spots, 3–3.5 cm, lobes 5; stamens 10, unequal, 1.5–2 cm, filaments pubescent at base; ovary ovoid, 5-lobed, 4–5 mm, densely tomentose; style longer than stamens, glabrous; stigma slightly expanded. Capsule cylindrical, 15–25 × 4–5 mm densely tomentose. Fl. Jun, fr. Aug.

Mixed forests, Rhododendron thickets, stony hillsides, rock ledges; 3200–4500 m. S Xizang [E Bhutan, NE India].

The following two varieties are may be distinguished by the indumentum, especially on the adaxial surface of the leaf blade. In cultivation the two varieties are clearly differentiated.


1 Leaf blade obovate, elliptic, or oblong-elliptic, indumentum thin, felted, brown to rufous, especially on adaxial surface.   399a var. tsariense
+ Leaf blade ovate to orbicular, indumentum thick, woolly, fawn to whitish, especially on adaxial surface.   399b var. trimoense

Lower Taxa


 

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