Cytogenetic Study of Interesting Five Genera and Six Species of Araceae from Thailand

The chromosome number and karyotype formula of interesting five genera six species Araceae from Thailand were studied, including Lasia spinosa —uncommon local Thai vegetable (2n=26, L6sm+L2st+Mm14+M4sm), Pistia stratiotes—common aquatic plant (2n=28, Lm10+Mm18), Pycnosphata palmata—rare endemic to Laos Lm12+L4sm+M6m+M2sm+M2st), Scittomaglottis calyptrata—rare in Lm6+L2sm+Mm6+Msm12), Typhonium glaucum—rare (2n=24, Lm6+Mm4+M6sm+Sm4+S4sm), T. trilobatum—common medicinal (2n=18, Lsm2+L6st+Mm2+Sm8). Satellites karyotypes Py. palmata, S. calyptrata, glaucum observed. symmetry is reported four species, while the asymmetry found two species. somatic numbers are recorded for first time have never had their studied previously. NF all time. numbers, NF, formulae, satellites this study can be used identification.