A description of the wood structure of Prosopis flexuosa DC. (Legum.) is given. It is semiring-porous, shows pores solitary, in multiples and in clusters; small to large-sized vessels with simple perforation plates, and thick vessel walls. Rays multiseriate and homogeneous. Paratracheal axial parenchyma and libriform fibres. The hydraulic tissue seems well adapted to very low rainfall and prolonged dry periods.