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Cal bilabiate, cleft nearly to the base, both lips ovate, the upper minutely 2-toothed, the lower 3-toothed; standard broadly obovate; wings and keel oblong-obovate,obtuse, the keel hairy along the lower margin; stamens 10, monadelphous in a closed tube, alternately long with globose anthers and short with linear ones; pods short, few-seeded, almost enclosed by the persistent cal; shrubs without normal lvs except in the juvenile stage, the petioles reduced to linear-subulate spines; fls bright yellow, solitary or paired in the axils of the spines. 20, Old World.
Sharply spinous shrubs. Lvs reduced to a spine-like tip or a small scale; stipules 0. Fls solitary or shortly racemose, axillary; bracts small; bracteoles small and broad, inserted below calyx, minute, or 0. Calyx membranous, usually yellowish, 2-partite with upper lip 2-toothed and lower lip 3-toothed. Corolla yellow; petals obtuse; keel hairy. Stamens monadelphous; tube entire; anthers alternately long and basifixed or short and versatile. Style somewhat curved; stigma capitate. Pod 2-valved and explosively dehiscent, 1-6-seeded; seeds strophiolate.
