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 Burundi: 4 taxa. Insects associated with this genus:
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| Species | Content | |
| diplotricha C.Wright | ||
| invisa Mart. ex Colla | ||
| pigra L. | Description, Image | |
| pudica L. | Description, Image |