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

365. Rhododendron aganniphum I. B. Balfour & Kingdon Ward, Notes Roy. Bot. Gard. Edinburgh. 10: 80. 1917.

雪山杜鹃 xue shan du juan

Shrubs, 1–4 m tall; young shoots glabrous. Petiole 8–15 mm, glabrous or with a few glands; leaf blade thickly leathery, oblong to elliptic-oblong, sometimes ovate-lanceolate or elliptic, 4.5–12 × 2–6 cm; base rounded to subcordate; margin revolute; apex acute and apiculate; abaxial surface white to yellowish or pale brown, sometimes turning deep red-brown, with indumentum 1-, rarely 2-, layered, dense, compacted to spongy tomentose, sometimes splitting, with or without pellicle, hairs branched; adaxial surface slightly rugulose, glabrous. Inflorescence racemose-umbellate, 10–20-flowered; rachis ca. 5 mm, glabrous. Pedicel 0.8–1.5 cm, glabrous; calyx lobes 5, 1–1.5 mm, rounded, glabrous, margin ± ciliate; corolla funnel-campanulate or campanulate, white or pale pink, with many purplish red spots inside, 3–3.5 cm, lobes 5, slightly unequal; stamens 10, filaments sparsely puberulent near base; ovary 4–5 mm, glabrous; style ca. 2.3 cm, glabrous. Capsule cylindric, straight, 15–25 × 5–7 mm. Fl. Jun–Jul, fr. Sep–Oct.

Coniferous forests, forest margins, thickets, mountains, slopes; 2700–4700 m. S Qinghai, W Sichuan, SE Xizang, NW Yunnan.

This species hybridizes in the wild with both Rhododendron phaeochrysum and R. proteoides.


1 Abaxial leaf surface with thin 2-layered ± agglutinate indumentum, upper layer pale brown, splitting to reveal white under layer, without a pellicle.   365c var. schizopeplum
+ Abaxial leaf surface with thick 1-layered spongy indumentum, with a pellicle.   (2)
       
2 (1) Abaxial leaf indumentum white to yellowish white, not splitting.   365a var. aganniphum
+ Abaxial leaf indumentum initially yellow, later becoming deep red-brown, splitting.   365b var. flavorufum

Lower Taxa


 

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Photos by The Biodiversity of the Hengduan Mountains Project  
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