Figure 1

Geographic distribution of P. marginata, P. allionii , P. hirsuta and P. latifolia in the SW Alps. Areas of distribution of P. marginata (red line), P. allionii (blue line), P. hirsuta (pink line) and P. latifolia (yellow line). Cytotype distribution of P. marginata according to Kress (1969): green squares = hexaploids; red squares = dodecaploids. The major mountain chains in the distributional areas of the species are labeled (Cottian, Maritime and Ligurian Alps within the Western Alps; Northern Apennines).