Abstract
In Ranunculus auricomus L. s.l., 3 different cytotypes (R. cassubicifolius Koch 2n = 16 and R. auricomus L. 2n = 24 and 2n = 32) grow in sympatry in Mauensee. Experimental crosses between diploid Ranunculus cassubicifolius Koch and tetraploid R. auricomus L. s.l. were made in order to test the probable origin of the triploid (2n = 24).
The offspring of the tetraploid, when taken as female parent, was only maternal, tetraploid (apomixis). The reciprocal cross {R. cassubicifolius diploid, female X R. auricomus tetraploid, male) produced 3 diploid individuals and 4 tetraploid ones, of which one was hypertetraploid (2n = 33). Their possible formation is discussed. Triploids were never obtained.
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