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2. Rhododendron subg. Pseudazalea Sleumer, Bot. Jahrb. Syst. 74: 525. 1949.
毛枝杜鹃亚属 mao zhi du juan ya shu
Yang Hanbi (杨汉碧 Yang Han-pi); David F. Chamberlain
Small to medium-sized shrubs, mostly deciduous or semievergreen, rarely evergreen; young shoots scaly, usually setose or hairy. Leaf blade with abaxial surface sparsely scaly, scales variously colored, vesicular. Inflorescence terminal, 2–6-flowered: flowers opening before leaf emergence. Calyx rimlike to clearly lobed, usually ciliate; corolla broadly campanulate or funnelform-campanulate, yellow, sometimes tinged with red, variably spotted, scaly, sometimes setose; stamens 10; filaments pubescent; ovary scaly, usually setose; style usually sharply deflexed. Capsule small, scaly. Seeds wingless, obscurely finned.
Six species: China, India, Myanmar, Nepal; six species (four endemic) in China.
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| 1 |
Leaves deciduous; flowers produced before leaves. |
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(2) |
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Leaves evergreen or sometimes semievergreen; flowers produced after leaves. |
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(3) |
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| 2 (1) |
Branchlets, petioles, pedicels, and leaf blade margin setose; scales on abaxial leaf surface subequal,
1–7 × their own diameter apart. |
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185 Rhododendron trichocladum |
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Branchlets, petioles, pedicels, and leaf blade margin usually not setose (leaf blade adaxially densely
long-setose in R. mekongense var. longipilosum); scales on abaxial leaf surface unequal, close to 4 ×
their own diameter apart. |
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186 Rhododendron mekongense |
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| 3 (1) |
Leaf bud scales persistent; ovary, calyx, corolla tube, capsule, and midrib on abaxial leaf surface
setose. |
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187 Rhododendron lepidostylum |
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Leaf bud scales deciduous; ovary, calyx, corolla tube, capsule, and midrib on abaxial leaf surface not
setose. |
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(4) |
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| 4 (3) |
Abaxial leaf surface markedly glaucous, sparsely scaly, scales 2–5 × their own diameter apart; branchlets and petioles usually not long-setose. |
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188 Rhododendron caesium |
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Abaxial leaf surface usually pale green, densely scaly, scales 1–3 × their own diameter apart; branchlets and petioles usually densely long-setose. |
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(5) |
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| 5 (4) |
Leaves semievergreen, not setose. |
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189 Rhododendron viridescens |
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Leaves evergreen, setose. |
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190 Rhododendron nanjianense |
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Lower Taxa
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