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1. Rhododendron sect. Azaleastrum Planchon ex Maximowicz, Mém. Acad. Imp. Sci. Saint Pétersbourg. Sér. 7, 16(9): 15, 45. 1870.
马银花组 ma yin hua zu
Shrubs or small trees, evergreen. Leaf blade ovate, broadly ovate, elliptic, elliptic-ovate or oblong-elliptic, [sometimes sparsely puberulent when young,] glabrous except on midrib. Inflorescence [subapical,] 1-flowered. Calyx lobes large and broad, glabrous or with short-glandular hairs or pubescence on the margin; corolla rotate or broadly funnelform; tube shorter than the lobes, rarely longer; lobes spreading; stamens 5, unequal; ovary 5-celled, with short glandular hairs; style glabrous, or with short glandular hairs near the base. Capsule conical, ovoid. Seeds without terminal appendages.
About nine species: China, Laos, Myanmar, Vietnam; eight species (five endemic) in China.
The present authors have seen no specimens of Rhododendron taichungianum S. S. Ying (Mem. Coll. Agric. Natl. Taiwan Univ. 31: 29. 1991), described from Taiwan. It is therefore not treated in this account.
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| 1 |
Style glandular-hairy for most of its length; leaf blade sublanceolate, 6–8 × 2–2.3 cm. |
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469 Rhododendron medoense |
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Style glabrous; leaf blade various. |
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(2) |
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| 2 (1) |
Corolla broadly tubular to tubular-funnelform, lobes shorter than tube, dark red; pedicel 4–8 mm. |
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468 Rhododendron vialii |
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Corolla rotate, lobes longer than tube, white or various shades of pink or purple (not known for R. tianlinense); pedicel 8–25 mm. |
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(3) |
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| 3 (2) |
Leaf blade lanceolate, oblong-lanceolate or elliptic-lanceolate; style 2–2.2 cm. |
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(4) |
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Leaf blade ovate, broadly ovate, elliptic, elliptic-ovate or oblong-elliptic; style 2.4–4 cm. |
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(5) |
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| 4 (3) |
Young shoots densely white-pubescent; calyx lobes ca. 7 mm; pedicel 15–25 mm. |
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466 Rhododendron leptothrium |
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Young shoots glabrous; calyx lobes ca. 5 mm; fruiting pedicel 13–15 mm. |
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467 Rhododendron tianlinense |
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| 5 (3) |
Calyx lobe margin glabrous, sometimes pubescent near the base on outer surface; capsule 8–9 mm. |
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(6) |
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Calyx lobe margin densely glandular-hairy; capsule 4–7 mm. |
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(7) |
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| 6 (5) |
Leaf blade ovate or elliptic-ovate; corolla purplish, purple or pink, with purple flecks within; stamens 1.5–2.1 cm. |
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462 Rhododendron ovatum |
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Leaf blade elliptic-oblong, rarely obovate-oblong; corolla white flushed red; stamens 2–2.5 cm. |
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463 Rhododendron mitriforme |
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| 7 (5) |
Bud-scales hairy on outer surface; corolla pink or purple; young shoots gray-brown pubescent and sparsely glandular-setose. |
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464 Rhododendron bachii |
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Bud-scales glabrous on outer surface; corolla white; young shoots glabrous or with a few short glandular hairs only. |
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465 Rhododendron hongkongense |
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Lower Taxa
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