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

369. Rhododendron przewalskii Maximowicz, Bull. Acad. Imp. Sci. Saint-Pétersbourg. 23: 350. 1877.

陇蜀杜鹃 long shu du juan

Shrubs, 1–3 m tall; young shoots, petioles, pedicels and calyces glabrous. Petiole yellowish, 10–15 mm; petioles, pedicels and calyces glabrous; leaf blade leathery, ovate-elliptic, elliptic, oblong or broadly oblong, 5–11 × 2.5–5 cm; base rounded or subcordate; apex obtuse, apiculate; abaxial surface indumentum compacted, 1-layered, gray-white, tawny to rust-yellow, cinnamon, or deep brown to ferruginous subagglutinated, hairs usually long-rayed stellate, gradually lost, sometimes persistent and branched; adaxial surface glabrous. Inflorescence corymbose-umbellate, 6–15-flowered; rachis ca. 10 mm, glabrous. Pedicel 1–1.5 cm; calyx 5-cleft, 1–1.5 mm; corolla campanulate or funnelform, white to pink, with purple-red spots inside, 2.5–3.5 cm, lobes 5; stamens 10, filaments slightly puberulent in lower half, or glabrous; ovary 4–5 mm, glabrous, sometimes sparsely pubescent; style glabrous, stigma capitate, green. Capsule oblong-cylindric, 15–20 × 4–5 mm. Fl. May–Jul, fr. Sep.

Forests, mountain slopes, often dominant in thickets; 2700–4300 m. SW Gansu, E and S Qinghai, W Shaanxi, N and W Sichuan.

Rhododendron przewalskii hybridizes with R. phaeochrysum where the two species meet (as at Kangding in W Yunnan). Because of this, there are a number of forms that cannot be definitely placed in either species.


1 Corolla campanulate; leaf blade base rounded or subcordate, abaxial surface densely gray-white, tawny to rust-yellow, sub-agglutinated, hairs long-rayed stellate, deciduous at maturity.   369a subsp. przewalskii
+ Corolla funnelform; leaf blade base cuneate, obtuse or subrounded; abaxial surface with indumentum persistent.   (2)
       
2 (1) Leaf blade 5–7 × 2.5–3 cm; abaxial surface densely dark red tomentose, hairs branched; ovary sparsely pubescent or glabrescent.   369d subsp. yushuense
+ Leaf blade 7–11 × 4–7 cm; abaxial surface stellate-hairy; ovary glabrous.   (3)
       
3 (2) Leaf blade with abaxial surface densely deep brown to ferruginous-floccose hirsute.   369b subsp. chrysophyllum
+ Leaf blade with abaxial surface densely gray-white to cinnamon long-tomentose.   369c subsp. huzhuense

Lower Taxa


 

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