Abstract
Thousand seed weight (TSW, g), achene size (mm) and fertility were evaluated in polyploid plants of C<sub>0</sub> (1999) and C<sub>1</sub> (2000) generations. The fertility of polyploid plants was usually very low (more than 10&times; compared to diploid plants). Only one plant (genotype A (tm) 1) was found as a tetraploid individual with anomalously high fertility, high TSW and large size of achenes. TSW in polyploid plants was 2.6&ndash;4.13 g, in diploid plants 2.0&ndash;2.3 g. The achene size was mostly about 3.7 mm (diploid plants) and 4.0&ndash;4.8 mm (polyploid plants). Achene (seed) size and thousand seed weight (TSW) can be classified among indirect identification methods (size of stomata, number of chloroplasts in guard cells, etc.) of polyploid plants. &nbsp; &nbsp;
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