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FOC | Family List | FOC Vol. 12 | Sapindaceae

11. Dimocarpus Loureiro, Fl. Cochinch. 1: 233. 1790.

龙眼属 long yan shu

Euphoria Commerson ex Jussieu; Pseudonephelium Radlkofer.

Trees or shrubs, usually monoecious. Leaves paripinnate; leaflets opposite or subopposite, entire or serrate. Thyrses usually large, terminal, or fascicles, stellate or tomentose; bracts and bracteoles subulate, small. Flowers unisexual, actinomorphic. Calyx cupular; sepals 5, imbricate, stellate or tomentose. Petals 5 or 1-4, sometimes absent, usually spatulate or lanceolate, without scales. Disk acetabuliform. Stamens (male flowers) often 8, exserted; filaments hirsute; anthers ellipsoid. Ovary (female flowers) obcordiform, 2- or 3-lobed and 2- or 3-loculed, densely tuberculate, tufted stellate and tomentose on tubercles; ovules 1 per locule; style between ovary lobes; stigma 2- or 3-lobed. Fruit deeply lobed into 2 or 3 schizocarps, usually 1 or 2 developed; fertile schizocarp berrylike, subglobose, with small sterile schizocarps at base, pericarp leathery (crustaceous when dry), endocarp papery. Seeds subglobose or ellipsoid; testa leathery, smooth; hilum elliptic, slightly large; pseudotesta fleshy, embedding all or half of seed; embryo straight, cotyledons thick. 2n = 30.

About seven species: S and SE Asia from Sri Lanka and India to E Malesia; Australia; cultivated in subtropical regions; four species (one endemic) in China.

See the revision by Leenhouts (Blumea 19: 113-131. 1971).

1 Inflorescences and calyx stellate; petals 5; fruit abaxially rugose and with slightly prominent tubercles.   1 D. longan
+ Inflorescences and calyx pilose or tomentose (inflorescences and flowers of D. yunnanensis not seen); petals absent or 1-4 abnormally developed; fruit abaxially with many conical short spines   (2)
2 (1) Leaflet blades abaxially thoroughly hairy.   2 D. confinis
+ Leaflet blades glabrous or only slightly pilosulose at lower part of midvein and lateral veins   (3)
3 (2) Leaflet blades 10-14 cm; branches terete.   3 D. fumatus subsp. calcicola
+ Leaflet blades 23-44 cm; branches with obtuse ridges.   4 D. yunnanensis

Lower Taxa


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