Neltuma flexuosa (formerly Prosopis flexuosa), commonly known as tortuous mesquite and a variety of Spanish vernacular names including algarrobo dulce and algarrobo negro, is a species of flowering tree in the genus Neltuma of the family Fabaceae. It is found in arid and semi-arid regions of Argentina, Bolivia and Chile, including the western Gran Chaco and the Monte Desert, where it is a conspicuous and characteristic plant of the region. Its timber is used for construction, charcoal and fuel and its fruits are eaten by humans and livestock.

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