Abstract
Records for 409 of 572 native and introduced grass species of Texas show that 30% are diploid, 30% are tetraploid, 11% are hexaploid or of a higher level of ploidy, and 29% have two or more ploidy levels. The relatively high percentage of diploids is due to the large number (40 species) of diploid panicums. In the present report a total of 304 chromosome counts are presented for 140 species. Chromosome counts for the following 22 species are the first for the taxon or different from previous records: Sitanion longifolium, Agrostis hiemalis, Axonopus affinis, Echinochloa walteri, Panicum hemitomon, P. thurowii, Eragrostis intermedia, E. swallenii, Neeragrostis reptans, Sporobolus asper, Tridens ambiguus, T. muticus, T. strictus, Triplasis purpurea, Bouteloua hirsuta, Chloris latisquamea, C. verticillata, Gymnopogon ambiguus, Hilaria mutica, Spartina alterniflora, S. patens, and Trichloris pluriflora. The records of 2n = 60 for Neeragrostis reptans, 2n = 40 for Triplasis purpurea, and 2n = 40 for Gymnopogon ambiguus are the first for the genera Neeragrostis, Triplasis, and Gymnopogon.
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