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30. Claoxylon A. Jussieu, Euphorb. Gen. 43, t. 14, f. 43. 1824.
白桐树属 bai tong shu shu
Authors: Huaxing Qiu & Michael G. Gilbert
Shrubs or trees, dioecious, rarely monoecious. Branchlets puberulent. Leaves alternate; stipules small or minute, deciduous; leaf blade mostly ± dentate; venation pinnate. Inflorescences axillary, unbranched; bracts small. Male flowers 1 to many per bract; sepals (2 or)3 or 4, valvate, closed in bud; petals absent; stamens (10-)20-30(-200); filaments free; anthers basifixed, 2-locular, theca almost free, erect; juxtastaminal glands many, short, erect, apex pilose; pistillode absent. Female flowers mostly 1 per bract; sepals 2-4; petals absent; disk annular or dissected; ovary 2- or 3(or 4)-locular; ovule 1 per locule; styles short, stigmatic surface papillose or plumose, recurved. Fruit a capsule, 2- or 3(or 4)-lobed. Seeds globose; testa fleshy, inner layer hard, foveolate-reticulate.
About 75 species: Old World tropics; six species in China.
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| 1 |
Ovary and capsule glabrous; disk with 3 separate glands |
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(2) |
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Ovary and capsule pubescent to tomentose; disk sinuous to 3-lobed |
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(3) |
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| 2 (1) |
Leaves membranous; male inflorescences 11-13 cm; stamens 40-50; female inflorescences 4-5 cm. |
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1 C. hainanense |
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Leaves thickly papery; male inflorescences 6-7 cm; stamens 30; female inflorescences 1.5-3 cm. |
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2 C. brachyandrum |
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| 3 (1) |
Leaves papery, adaxially pilose, often purplish; stamens 15-25; cocci tomentulose, sutures raised. |
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3 C. indicum |
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Leaves membranous, adaxially almost glabrous; stamens more than 25; cocci pilose or tomentulose, sutures not raised |
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(4) |
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| 4 (3) |
Stamens ca. 27; infructescence 2-3 cm. |
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6 C. subsessiliflorum |
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Stamens 35-50; infructescence 4-10 cm |
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(5) |
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| 5 (4) |
Male flowers 7-9 per bract; capsule tomentulose. |
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4 C. longifolium |
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Male flowers 3-5 per bract; capsule pilose or glabrous. |
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5 C. khasianum |
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Lower Taxa
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