RESUMO -Na revisão do gênero Sorghastrum para o Rio Grande do Sul, a espécie S. nutans (L.) Nash foi excluída, por não ter sido encontrada no Estado. Por apresentar características bem distintas de S. nutans, é proposta a elevação de S. nutans (L.) Nash ssp. albescens (Hackel) Burkart, citado anteriormente para o Estado, para espécie, resultando na nova combinaçãü S. albescens (Hackel) Flores.Palavras Chave: Nomenclatura, Andropogoneae, Gramineae.ABSTRACT -The genus Sorghastrwn was studied in Rio Grande do Sul. S. nutans does not occur in the area and was excluded from the flora of the State. The ocurrence of S. nutans (L.) Nash ssp. albescens (Hackel) Burkart was confmned. Since this taxon shows different morfological ,characteristics, as compared to S. nutans, it must be considered as a different species. The new taxonomic combination S. albescens (Hackel) Flores is suggested.
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