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6. Rhododendron subg. Azaleastrum Planchon ex K. Koch, Dendrologie. 2(1): 159. 1872.
马银花亚属 ma yin hua ya shu
He Mingyou (何明友); David F. Chamberlain
Shrubs or small trees, evergreen; new foliage shoots arising from subterminal buds and from axils of leaves; young shoots not scaly, glabrous or pubescent and glandular-setose. Leaf blade not scaly. Inflorescence subterminal, 1- to several-flowered. Calyx lobes large or inconspicuous; corolla rotate-funnelform to narrowly funnelform, tube usually shorter than the lobes, rarely longer; stamens 5 or 10, unequal; filaments pubescent; ovary 5–6-locular, glabrous, pubescent or shortly glandular-hairy; style glabrous or shortly setose near base. Capsule conical ovoid or cylindric, glabrous or pubescent, with glandular setae.
About 30 species: from China and Japan to peninsular Malaysia and Indonesia; 26 species (18 endemic) in China.
Recent evidence from DNA sequencing suggests that the two sections in Rhododendron subg. Azaleastrum are only distantly related; each may therefore merit subgeneric rank in its own right. For the most recent Chinese account of R. subg. Azaleastrum see Gao Lianming (Phylogeny of Rhododendron subg. Azaleastrum sensu Sleumer (Ericaceae). PhD thesis, Kunming Institute of Botany. 2002), who (pers. comm., 2004) reviewed the same subgenus in the present account.
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Stamens 5; calyx lobes large and broad; capsule conical-ovoid, upper valves and style not contiguous when mature; seeds without terminal appendages. |
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1 Rhododendron sect. Azaleastrum |
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Stamens 10; calyx lobes inconspicuous or rarely narrowly lanceolate; capsule cylindric, upper valves and style contiguous when mature; seeds with short caudate appendages at both ends. |
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2 Rhododendron sect. Choniastrum |
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Lower Taxa
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