Studies on the cytotaxonomy and mode of reproduction of Leontodon (Compositae)

The following documented chromosome counts are presented: Leontodon autumnalis L. 2n = 12, L. crispus Vill. 2n = 8, L. helveticus Mérat em. Widder 2n = 12, L. hispidus L. 2n = 14, L. incanus (L.) Schrank 2n = 8, L. montanus Lam. 2n = 12, L. saxatilis Lam. ssp. hispidus (Roth) Holub et Moravec 2n = 8, L. saxatilis Lam. ssp. taraxacoides (Vill.) Holub et Moravec 2n = 8, L. tuberosus L. 2n = 8, L. »ambiguus» Fleischer (= L. autumnalis × hispidus) 2n = 14. The idiograms of L. crispus, L. helveticus, L. incanus, L. montanus and L. tuberosus are presented for the first time. Pollination experiments with L. autumnalis, L. crispus, L. hispidus, L. saxatile and L. tuberosus showed that self-incompatibility prevails in these species. Cross-compatibility was found in most combinations within populations and between populations belonging to different taxa of L. hispidus (including L. danubialis Jacq.). No signs of apomixis were observed. The phylogenetic trends in the karyotypes agreed with those of the tribe Cichoriae in general.