Abstract: Aloe ferox Miller and Aloe arborescens Miller belong to Liliaceae Aloe (genus). In this paper, the chromosome were observed by routine root tip method.The results shows that the chromosome number of Aloe ferox and Aloe arborescens were 2n=14. The karyotype of Aloe ferox Miller is K(2n)=4sm+10st, and the karyotype of Aloe arborescens is K(2n)=4sm+10st, by Levan's crierion of chromosome karyotype and belong to "4C"and "3C"of stebbins karyotype symmetry.The chromosome composition of relative lenth were 2n=14=6L+2M 2+6S. There are not acrocentric chromosomes and any satellite chromosome being observed.The chromosome constitution of Aloe ferox Miller and Aloe arborescens Miller are four long and three short.According to the karyotype, we considered chromosome basic number as x=7.

Key words: Chromosome, Karyotype, Aloe ferox Miller, Aloe arborescens Miller