The reduction division in PMC's was studied in 5 interspecific hybrids: N. suaveolens× N. plumbaginifolia, N. suaveolens×N. longiflora, N. gossei×N. plumbaginifolia, N. gossei×N. longiflora and N. gossei×N. alata. N. suaveolens and N. gossei are Australasian species and N. alata, N. plumbaginifolia and N. longiflora are American species. These five plants are low chromosome number species and have a similar external morphology.
