Rheochloa (Poaceae : Chloridoideae), a new genus from central Brazil

Rheochloa scabiflora Filg., P.M. Peterson & Y. Herrera, gen, et sp, nov., i s described and illustrated. The new species occurs in humid grasslands of Municipio de Mineiros, Goias, Parque Nacional das Emas in central Brazil. I t seems most closely allied with Dinebra but differs by its perennial habit , inflorescences composed of 3-5 subdigitate racemes, short pedicellate spi kelets, glabrous lemmas that are ciliolate on the apex, and fusiform caryop ses with persistent style bases. Rheochloa is tentatively placed in subtrib e Eragrostidinae of tribe Eragrostideae. So far, R. scabriflora is known on ly from a single population located inside Parque Nacional das Emas (18 deg rees 17'55 " S-52 degrees 43'79 " W).