Structure and diversity of the piedmont scrub adjacent to the metropolitan area of Monterrey, Nuevo León, Mexico Authors: Alanís-Rodríguez, Eduardo, Jiménez-Pérez, Javier, Mora-Olivo, Arturo, Martínez-Ávalos, José Guadalupe, Mata-Balderas, José Manuel, Chávez-Costa, Alejandro Collantes, Rubio-Camacho, Ernesto A.