Abstract
The Genus is dibasic with x=5 and 7. Section Verbenaca have small chromosomes where as species belonging to section Glandularia possess larger chromosomes with symmetrical karyotype. Furthermore, species belonging to the two sections are cross incompatible and all attempts to cross them were futile. The species belonging to section Glandularia, though with the same chromosome number, are dissimilar in their karyotype which speaks of the genomic differentiation during speciation. V. aubletia, a hexaploid species, has smaller chromosomes than the diploid species and has 2 types of satellites indicating involvement of at least 2 species in its origin.
