“…Although most reports indicate that n = 11 (2n = 22), values of 2n = 24, 33, 34, 44, 48, 66, 70 have also been observed (Darlington and Wylie, 1955;Bolkhoviskikh et al, 1969;Moore, 1973Moore, , 1974Moore, , 1977Golblatt, 1981Golblatt, , 1984Golblatt, , 1985Golblatt, , 1988Goldblatt and Johnson, 1990, 1991, 1996, 1998. Galiano (1987) considered Stevia as a multibasic genus, with x = 11, x = 12 and x = 17, while Frederico et al (1996) considered its basic chromosome number as x = 11. According to This variation reflects numerical (aneuploidy and polyploidy) and structural changes, mainly pericentric inversions (Frederico et al, 1996).…”