Taxonomic synopsis and distribution of Turneraceae in Maranhão state, Brazil

The taxonomic treatment of the Turneraceae species from Maranhão state, Brazil is presented. Twenty-one species distributed in two genera were recognized: Piriqueta, with seven species, and Turnera with 14, of which P. guianensis, T. aurantiaca and T. blanchetiana are new records for the state. Turnera aurantiaca is also a new occurrence for the northeastern region of Brazil. In general, the species were frequently found in the cerrado vegetation, being mainly associated with open and anthropized areas. Identication keys, descriptions, photographs, general comments, conservation status and taxa distribution maps for the Maranhão state are presented.