Paspalum equitans is a sexual, cross-pollinated diploid (2n = 2x = 20) with normal meiosis. It has some potential for apomixis because one or two aposporous embryo sacs were observed beside the meiotic sac in 18.2% of the ovules. Regular meiotic behavior was confirmed in tetraploid (2n = 4x = 40) P. ionanthum (= P. guaraniticum), which has 20II at meiosis and is cross-pollinated. Hybrids were produced between P. equitans and diploid P. cromyorrhizon, a species with the basic N genome. A high degree of meiotic chromosome pairing in the hybrids demonstrated that P. equitans also has the N genome. However, these species are isolated because the F1 hybrids are sterile. Meiotic chromosome pairing in hybrids of P. ionanthum x diploid and tetraploid P. cromyorrhizon indicated that at least one genome of P. ionanthum is a form of the N genome. Moreover, 1-7III were observed in ca. 75% of pollen mother cells of P. ionanthum x diploid P. cromyorrhizon triploid hybrids, and quadrivalents were observed in P. ionanthu...