Chromosome Number and Karyotype of two Stephanandra Species (Rosaceae)

Abstract

The chromosome number and karyotype of two Japanese Stephanandra species, S. incisa and S. tanakae, were investigated. Both species had the same chromosome counts of n=9 and 2n=18, which showed that the basic chromosome number of the genus was x=9. The two species had similar karyotypes, with 7 metacentric pairs, one of which had a satellite, and 2 submetacentric pairs.