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

420. Rhododendron pocophorum I. B. Balfour ex Tagg, Notes Roy. Bot. Gard. Edinburgh. 15: 316. 1927.

杯萼杜鹃 bei e du juan

Shrubs, evergreen, 0.6–3 m tall; shoots 5–6 mm in diam. below inflorescence; young shoots glandular-setulose. Petiole stout, 10–15 mm, glandular-hairy and tomentose when young; leaf blade thickly leathery, oblong to obovate, 6.5–14 × 2.5–5.6 cm; base cuneate; apex obtuse, markedly apiculate; abaxial surface indumentum patchy or continuous, thickly rufous tomentose; adaxial surface glaucous, glabrous when mature, midrib grooved adaxially; lateral veins 12–14-paired, impressed adaxially. Inflorescence dense, 10(–20)-flowered; rachis ca. 5 mm, tomentose. Pedicel 0.7–1.8 cm, densely glandular-hairy and tomentose; calyx cupular; lobes 5, 6–10 mm, unequal, glabrous outside, margin glandular-ciliate; corolla tubular-campanulate, fleshy, light to deep crimson, with deeply colored flecks, 4–5 cm, nectar pouches at base; lobes 5, emarginate; stamens 10, unequal, 2–3.5 cm, filaments glabrous; ovary conoid, ca. 7 mm, densely glandular-hairy; style ca. 2.6 cm, glabrous; stigma small. Capsule 20–25 × 7–9 mm. Fl. Jul, fr. Sep.

Forests, thickets, rocky slopes; 3300–4500 m. SE Xizang, NW Yunnan [NE India].

Rhododendron ×hemigymnum (Tagg & Forrest) D. F. Chamberlain (Notes Roy. Bot. Gard. Edinburgh 37: 333. 1979 [“hemigynum”]; R. chaetomallum I. B. Balfour & Forrest var. hemigymnum Tagg & Forrest, Notes Roy. Bot. Gard. Edinburgh 16: 189. 1931), described from Xizang, is a hybrid between R. pocophorum and R. eclecteum. It is intermediate between the two putative parents, with the broad petiole, leaf blade shape, and setose to stipitate-glandular young shoots and petioles of R. eclecteum, but with a leaf indumentum more typical of R. pocophorum. Both parents occur at the localities from which this entity has been recorded.


1 Abaxial leaf surface with continuous indumentum.   420a var. pocophorum
+ Abaxial leaf surface with a patchy discontinuous indumentum.   420b var. hemidartum

Lower Taxa


 

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