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FOC | Family List | FOC Vol. 11 | Euphorbiaceae

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)

1 Male pedicels 13-18 mm.   7 D. cumingii
+ Male pedicels to 5 mm   (2)
2 (1) Stamens 4-8, inserted in sinuses between disk lobes; flowers in elongated inflorescences, branched or unbranched   (3)
+ Stamens 10-25, disk annular; flowers in sessile clusters   (4)
3 (2) Leaf blade margin toothed, reticulate veins distant; filaments short and slightly flattened; shrub to 4 m.   3 D. arcuatinervia
+ Leaf blade margin entire, reticulate veins dense and prominent; filaments terete; trees to 15 m.   11 D. indica
4 (2) Stamens 18-25, filaments flattened, wider at base   (5)
+ Stamens 10-15, filaments slender, terete   (6)
5 (4) Petiole 8-10 mm; leaf apex obtuse, margin entire.   9 D. hainanensis
+ Petiole 3-6 mm; leaf apex acute, margin obtusely serrate.   1 D. perreticulata
6 (4) Branchlets pubescent; leaf blade 4.5-6 cm, lateral veins 7-9 pairs.   6 D. congestiflora
+ Branchlets glabrous; leaf blade 6-11 cm, lateral veins 8-14 pairs   (7)
7 (6) Flowers 1-3 per cluster, with cup-shaped rudimentary ovary.   12 D. salicifolia
+ Flowers 3-5 per cluster, without rudimentary ovary.   2 D. hoaensis

List of Keys

  • List of lower taxa


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