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New Italian populations of Knautia dinarica , formerly known only for Sila (Calabria, Southern Italy), were discovered in Abruzzo (Central Italy) and Basilicata (Southern Italy). In order to correctly classify these populations, a taxonomic study was carried out, including morphological and karyological analyses and the typification of the names Knautia sylvatica var. dinarica and K. arvensis f. silana . We conclude that in Italy only K. dinarica subsp. silana occurs, to be considered as endemic to central-southern Apennines and vicariant of K. dinarica subsp. dinarica , occurring in the Balkan peninsula. Both subspecies can be either diploid (2 n = 20) or tetraploid (2 n = 40), and are distinguished by the different mean shape of the basal leaves (the ratio length/width is higher in Italian plants).

Knautia dinarica (Caprifoliaceae): taxonomy, typification and update of the Italian distribution