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Inflorescence racemose, usually simple; bracts densely parallel-veined, caducous; bracteoles valvate, fused with the hypanthium.
Pods oblong-obovate, compressed, dehiscent, with a lateral nerve; upper suture winged or not.
Stamens 9–10, usually 9 united at the base and 1 free; anthers often with dorsal teeth.
Petals 1–5 but only one fully developed, the rest much reduced or absent.
Ovary hairy, 1–6-ovulate; style elongate; stigma capitate or peltate.
Sepals 5, variously reduced.
Shrubs or trees, evergreen.
Hypanthium up to 5 mm long.
Seeds with a thin testa.