ABSTRACT
Diego Sotero de Barros Pinangé,1 Susane Cavalcanti Chang1 and Wilfried Morawetz2
Except for insects, fl owering plants are the most diverse group of organisms of our planet, being extremely important for land life, since they provide primary organic matter and outline environmental landscapes. Plants also deliver the main resources for human populations, including the ones that inhabit the Brazilian semi-arid region, providing food, medical products, construction material, fuel and forage.
