Herbs or shrubs; stems armed with prickles. Leaves 2-pinnate, sensitive (in ours). Inflorescences of ovoid or subspherical heads which are axillary or arranged in clusters. Flowers bisexual or male. Calyx very small. Corolla gamopetalous, (3-)4(-6)-lobed. Pods flat, bristly or prickly (in ours), splitting transversely into 1-seeded segments. Worldwide: 480 species in tropical and warm regions, especially America Mozambique: 6 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| bimucronata (DC.) Kuntze | N,Z | |
| busseana Harms [NrEnd] [LR-lc] | N | Description, Image |
| diplotricha C. Wright ex Sauvalle var. diplotricha | Z | |
| diplotricha C.Wright ex Sauvalle var. inermis (Adelb.) Verdc. | Z | |
| mossambicensis Brenan [NrEnd] | T,?MS | |
| pigra L. | N,Z,T,MS,GI,M | Description, Image |