Dimorfismo floral e ocorrência de andromoicia em Vatairea macrocarpa (Benth) Duncke (Fabaceae - Faboideae)

We studied the floral biology of natural populations of Vatairea macrocarpa (Benth.) Duncke in an area of the Cerrado (Brazilian savanna) in Chapadinha, Maranhao, Brazil. The flowers of this species are papilionacea-type; however, we observed androgynous flowers with a functional androecium and gynoecium and staminate flowers with an atrophied gynoecium in the same infl orescence. For this reason, V. macrocarpa should be considered an andromonoecious species.