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FOC | Family List | FOC Vol. 14 | Ericaceae

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.

1 Style glandular-hairy for most of its length; leaf blade sublanceolate, 6–8 × 2–2.3 cm.   469 Rhododendron medoense
+ Style glabrous; leaf blade various.   (2)
2 (1) Corolla broadly tubular to tubular-funnelform, lobes shorter than tube, dark red; pedicel 4–8 mm.   468 Rhododendron vialii
+ Corolla rotate, lobes longer than tube, white or various shades of pink or purple (not known for R. tianlinense); pedicel 8–25 mm.   (3)
3 (2) Leaf blade lanceolate, oblong-lanceolate or elliptic-lanceolate; style 2–2.2 cm.   (4)
+ Leaf blade ovate, broadly ovate, elliptic, elliptic-ovate or oblong-elliptic; style 2.4–4 cm.   (5)
4 (3) Young shoots densely white-pubescent; calyx lobes ca. 7 mm; pedicel 15–25 mm.   466 Rhododendron leptothrium
+ Young shoots glabrous; calyx lobes ca. 5 mm; fruiting pedicel 13–15 mm.   467 Rhododendron tianlinense
5 (3) Calyx lobe margin glabrous, sometimes pubescent near the base on outer surface; capsule 8–9 mm.   (6)
+ Calyx lobe margin densely glandular-hairy; capsule 4–7 mm.   (7)
6 (5) Leaf blade ovate or elliptic-ovate; corolla purplish, purple or pink, with purple flecks within; stamens 1.5–2.1 cm.   462 Rhododendron ovatum
+ Leaf blade elliptic-oblong, rarely obovate-oblong; corolla white flushed red; stamens 2–2.5 cm.   463 Rhododendron mitriforme
7 (5) Bud-scales hairy on outer surface; corolla pink or purple; young shoots gray-brown pubescent and sparsely glandular-setose.   464 Rhododendron bachii
+ Bud-scales glabrous on outer surface; corolla white; young shoots glabrous or with a few short glandular hairs only.   465 Rhododendron hongkongense

Lower Taxa


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