Trees. Leaves spirally arranged; stipules absent. Flowers bisexual, solitary or in few-flowered fascicles, axillary or in axils of fallen leaves. Calyx a single whorl of 5 free imbricate sepals. Corolla cyathiform; lobes 5, free almost to base, simple, imbricate, spreading or reflexed at tip. Stamens 10-15, 2 or 3 opposite each corolla lobe, arising ?-1/2-way up on corolla lobes; filaments of each pair or group of 3 fused almost to apex, hairy; anthers extrorse, hairy or glabrous; staminodes 5, usually 3-dentate at apex, hairy. Disc absent. Ovary 10-locular; placentation axile; style slightly exserted. Fruit subglobose, several-seeded. Seed strongly laterally compressed; testa smooth, shiny; scar adaxial, almost full length, very narrow; embryo with thin foliaceous cotyledons and exserted radicle; endosperm present.
Species 2, W trop. Africa; sthn trop. Afr. 1: Tridesmostemon omphalocarpoides Engl., Angola (Cabinda).
Sideroxylon in sense of Greves: 71 (1927).
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