Abstract
The mode of reproduction, pollen pro- duction, chromosome numbers, genetic variation (RAPD, allozymes) and overall similarity were studied in 6 species of Hieracium sect. Alpina in the Tatry Mts. (the Western Carpathians, Slovakia). All species were confirmed to be agamospermous and, except of H. krivanense and H. slovacum, lacking pollen grains. For the first time, a chromo- some number is reported for H. krivanense (2n ¼ 4x ¼ 36). Considerable genetic variation was revealed in H. alpinum and a correlation between geographic and genetic distances was found in this species. Between-population variation in RAPD and allozyme phenotypes was found in H. pineto- philum and H. crassipedipilum. In all other species, allozyme and RAPD variation was low or absent. With few exceptions, the species differ in their allozyme as well as RAPD patterns. The related- ness of one population of endemic H. slovacum and H. halleri was confirmed. It is shown, that Carpa- thian species of the H. fritzei group are derived from at least two ancestors.
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