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Nord. J. Bot. -Section of holarctic and general taxonomy A new species and two new combinations of Leontodon (Asteraceae, Hypochoeridinae) Alvaro Izuzquiza Izuzquiza, A. 1991. A new species and two new combinations of Leontodon (Asteraceae, Hypochoeridinae). -Nord. J. Bot. 11: 3 H O . Copenhagen. ISSN 0107-055X.Leontodon pahiae sp. nov. occurring in the Iberian Peninsula, Morocco and the Canary Islands is described and illustrated. Cytological data as well as some preliminary results of self-incompatibility tests in L . palisiae are presented. A comparative carpological study of L. muelleri, L. palisiae and L. salzmannii using the SEM is made, and an identification key of these three species is provided. Two new combinations, L. muelleri ssp. trivialis comb. nov., from Morocco, and L. kralikii comb. nov., from Libya and Tunisia, are proposed. All taxa belong to the series Annui of sect. Kalbfussia in subgenus Oporinia. The basic chromosome number x=5 is here reported for the first time within the genus.