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Fabaceae-Mimosoideae family

Mimosa quadrivalvis
Linnaeus var. leptocarpa (de Candolle) Barneby
, Mem. New York Bot. Gard. 65: 298.  1991. 
Bas.: Schrankia leptocarpa de Candolle (1825). 

Indigenous quite common very spiny scrambling herb of moist open degraded spots at lower elevations, often covering large areas.
Martinique, St. Lucia, St. Vincent, Greater Antilles (Puerto Rico), Mesoamerica, South America.

Leaves sensitive to touch.
Similar to, and often in asociation, with Mimosa pudica.  This species is spiny, the 2-3 pairs of leaflets are spaced out, and the fruit is long and thin.
See also Mimosa camporum which is erect and has three to many pairs of leaflets, and a different shaped fruit.
Neptunia plena has yellow flowers.