“…is native to Uruguay, central-eastern Argentina and the state of Rio Grande do Sul in Brazil (Quarín and Lombardo, 1986). Chromosome numbers reported for this species include 2n = 2x = 20 (Saura, 1941;Núñez, 1952;Quarín and Lombardo, 1986;Norrmann et al, 1989), 2n = 3x = 30 (Burton, 1942;Quarín and Lombardo, 1986;Norrmann et al, 1989), 2n = 4x = 40 (Burson and Bennett, 1970;Quarín and Lombardo, 1986;Norrmann et al, 1989), and 2n = 6x = 60 (Krishnaswamy, 1940). The cytogenetic architecture in this species has been inferred from meiotic behavior.…”