<italic>Xyris irwinii</italic> (Xyridaceae), a new <italic>cerrado</italic> species from Goiás, Brazil.

<italic>Xyris irwinii</italic> (Xyridaceae), a new species from the <italic>cerrado</italic> of Goiás, Brazil is described and illustrated. The distribution, phenology, and conservation status of the new species are presented, as well as a comparison of a complex of morphologically related <italic>cerrado</italic> species. [ABSTRACT FROM AUTHOR]