Karyology of some species of Alkanna (Boraginaéeae) from Bulgaria
The diploid chromosome number 2_n_ = 2_x_ = 20 is reported for two Balkan endemics (Alkanna primuliflora and A. stribrnyi) and two Bulgarian endemics (A. stojanovii and A. jordanovii), and their characteristic karyotypes are illustrated.