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17. Drypetes Vahl, Eclogae Amer. 3: 49. 1810.
核果木属 he guo mu shu
Authors: Bingtao Li & Michael G. Gilbert
Cyclostemon Blume.
Trees or shrubs, dioecious; indumentum of simple hairs, often absent. Leaves alternate; stipules 2; petioles short; leaf blade simple, base often asymmetrical, margin entire or serrate, venation pinnate. Inflorescences axillary, sometimes grouped into glomerules, racemes, or panicles. Male flowers pedicellate or sessile; sepals 4-6, distinct, usually unequal, imbricate; petals absent; stamens 1-25, 1 to several whorls surrounding disk or outer ones inserted at margin or sinus of disk, inner ones inserted on disk; filaments free; anthers bilocular, usually introrse, rarely extrorse, longitudinally dehiscent; disk flattened or concave, margin shallowly or deeply fid; rudimentary ovary very small or absent. Female flowers solitary, axillary, sometimes on older branches; sepals as in male; petals absent; disk annular; ovary 1- or 2(or 3)-loculed; ovules 2 per locule; style short, stigmatiform; stigmas 1 or 2(or 3), usually dilated, peltate or reniform. Fruit a drupe, subglobose or ovoid, 1- or 2(or 3)-celled, seeds 1 per locule; exocarp leathery or nearly so; mesocarp fleshy or woody; endocarp woody, papery, or crustaceous. Seeds without caruncle; endosperm fleshy; cotyledons larger and flattened.
About 200 species: tropical and subtropical Africa, America, and Asia; 12 species (two endemic) in China.
The timber from several species is valued.
Key to material with male flowers (not known for D. integrifolia, D. littoralis, D. longistipitata, and D. obtusa)
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1 |
Male pedicels 13-18 mm. |
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7 D. cumingii |
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Male pedicels to 5 mm |
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(2) |
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2 (1) |
Stamens 4-8, inserted in sinuses between disk lobes; flowers in elongated inflorescences, branched or unbranched |
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(3) |
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Stamens 10-25, disk annular; flowers in sessile clusters |
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(4) |
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3 (2) |
Leaf blade margin toothed, reticulate veins distant; filaments short and slightly flattened; shrub to 4 m. |
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3 D. arcuatinervia |
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Leaf blade margin entire, reticulate veins dense and prominent; filaments terete; trees to 15 m. |
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11 D. indica |
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4 (2) |
Stamens 18-25, filaments flattened, wider at base |
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(5) |
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Stamens 10-15, filaments slender, terete |
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(6) |
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5 (4) |
Petiole 8-10 mm; leaf apex obtuse, margin entire. |
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9 D. hainanensis |
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Petiole 3-6 mm; leaf apex acute, margin obtusely serrate. |
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1 D. perreticulata |
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6 (4) |
Branchlets pubescent; leaf blade 4.5-6 cm, lateral veins 7-9 pairs. |
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6 D. congestiflora |
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Branchlets glabrous; leaf blade 6-11 cm, lateral veins 8-14 pairs |
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(7) |
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7 (6) |
Flowers 1-3 per cluster, with cup-shaped rudimentary ovary. |
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12 D. salicifolia |
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Flowers 3-5 per cluster, without rudimentary ovary. |
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2 D. hoaensis |
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List of Keys
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List of lower taxa
Related Links (opens in a new window) |
Treatments in Other Floras @ www.efloras.org
Other Databases
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