Experimental study on reproduction of Hypericum X desetangsii nothosubsp. carinthiacum (A. Frohl(.)) N. Robson (Hypericaceae)

Reproduction of natural hybrid H. x desetangsii nothosubsp. carinthiacum (H . perforatum L. x H. maculatum Crantz subsp. maculatum) of three different ploidy levels was studied. Facultative and pseudogamous apomixis is known i n H. perforatum that represents mother plant of the hybrid studied. Selfing , backcrossing of the hybrid as well as crossings with other taxa were carr ied out. Chromosome numbers of the offspring obtained after the performed p ollinations were counted in order to explain its origin. Presented results confirmed the occurrence of facultative apomixis with pseudogamy in the hyb rid studied. Various ploidy levels from triploid to heptaploid ones as well as aneuploids and mixoploids were found among the progeny.