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1. Rhododendron sect. Trachyrhodion Sleumer, Bot. Jahrb. Syst. 74: 529. 1949.
糙叶杜鹃组 cao ye du juan zu
Small shrubs; young branches scaly and pilose or strigose. Leaf blade with both surfaces, or at least the abaxial surface, scaly and usually hairy at least along veins, sometimes without hairs. Inflorescence 1–4-flowered. Calyx with obvious lobes or reduced to a rim, abaxially densely pubescent; corolla tubular-campanulate or funnelform, white or pink to deep red, outer surface scattered with glandular scales or glabrous, usually without hairs, pilose or glabrous; ovary densely scaly and hairy; style glabrous or pilose near base. Capsule scaly and pubescent. Seed wingless.
Seven species: China.
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| 1 |
Calyx developed, with conspicuous lobes. |
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(2) |
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Calyx shallowly cup-shaped, without conspicuous lobes. |
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(3) |
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| 2 (1) |
Leaf blade 3–7 × 1–2.5 cm; corolla 5-lobed to below the middle; shrubs 0.5–2 m tall; branches stout and
straight. |
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196 Rhododendron scabrifolium |
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Leaf blade 1.2–4 × 0.4–1.2 cm; corolla 5-lobed to the middle; shrubs 0.2–0.6(–2) m tall; branches many,
thin. |
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197 Rhododendron spiciferum |
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| 3 (1) |
Plant pubescent, not hirsute. |
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(4) |
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Plant pubescent and hirsute. |
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(5) |
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| 4 (3) |
Abaxial leaf surface with brown scales but without hairs, grayish white; corolla 0.9–1.3 cm. |
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191 Rhododendron hemitrichotum |
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Abaxial leaf surface densely pubescent; corolla 2–2.7 cm. |
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192 Rhododendron mollicomum |
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| 5 (3) |
Corolla shortly funnelform; lobes obviously spreading; leaf blade ca. 2.2 × 0.6 cm, both surfaces
densely pubescent and long hispid. |
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195 Rhododendron pubescens |
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Corolla tubular or tubular-campanulate; lobes not or only slightly spreading; leaf blade 2.8–4.5 ×
1–3.8 cm, both surfaces pubescent only. |
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(6) |
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| 6 (5) |
Corolla tubular, lobes shorter than tube, erect, not spreading; corolla bright red; filaments glabrous. |
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193 Rhododendron spinuliferum |
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Corolla tubular-campanulate, lobes as long as tube, erect or slightly spreading; corolla pinkish
red; filaments densely pubescent. |
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194 Rhododendron x duclouxii |
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Lower Taxa
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