Article

A further contribution to the cytotaxonomy of the genus Erysimum L. in NW lta1y has been carried out. In the present study 19 popu1ations of Erysimum jugicoòa Jordan, E. nevadense Reuter subsp. collisparsum_ (Jordan) P. W. Ball, E. rhaeticum (Schleicher ex Hornem.) DC., E. pseudorhaeticum Polatschek and E. virgatum Roth. have been analysed. Six populations with a new cytotype (2_n_ = 36-40) were found in W Liguria and new locali ti es for already known cytotypes have been recorded. The results are shown in the geographical distribution map.