Medicinal plants popularly used in the Xingó region - a semi-arid location in Northeastern Brazil.

"AcknowledgementsWe thank Dr. Laise de Holanda C. Andrade, for her helpful advice; the Instituto de Ciência e Tecnologia de Xingó, for lending its facilities; the cartographic engineer Helder Gama, for designing the map; CNPq, for bursary number DTI-7H; and the researchers Débora Coelho, Eulina Nery, and Linete Cordeiro and the health agents that undertook the interviews. We also thank CNPq and FACEPE ("Primeiros Projetos" Program) for financial support to U.P. Albuquerque. We thank for Plant identification to the following specialists: Pereira, R.; Siqueira, J. C.; Sales, M.; Harley, R. M.; Bautista, H. P.; Costa, J. A.; Pedrall, I. G.; Lucena, M. F. A.; Silva, R. A.; Barroso, G. M.; Furlan, A.; Cervi, A. C.; Pinto, G. C.; Pirani, J. R.; Lombardi, J. A."