The generic concept ofGelasineHerb. (Iridaceae) is reviewed, and the characters discussed in connection withSphenostigmaBak., a synonym ofGelasine.The reduction ofSphenostigmais further justified on account of overlapping features. A new species from Uruguay,G. uruguaiensisRav. sp. nov., is described and illustrated. This is shown to include two subspecies: ssp.uruguaiensis, and ssp.orientalisssp. nov. The chromosome number of the latter is 2n = 14.
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