Abstract
Parnassia palustris var. multiseta collected in the Altai Mountains in Russia and Mongolia showed four cytotypes with the respective chromosome numbers of 2n=18, 27, 36 and 45. They could be diploid, triploid, tetraploid and pentaploid respectively, if the basic chromosome number of x=9 was accepted. The chromosome number of 2n=45 was reported here for the first time in the Russian plants studied, while the other chromosome numbers verified the previous reports.
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