Abstract
Chromosome count data (2n) for 6 species of aquatic and semi-aquatic species from 11 localities are given: Callitriche hermaphroditica 2n = 6, Hippuris vulgaris 2n = 32, Potamogeton berchtoldii 2n = 26, Ranunculus subrigidus 2n = 16, R. trichophyllus 2n = 32, Sagittaria natans 2n = 22. For counting, both materials fixed in the field and seedlings grown in laboratory conditions (species of Ranunculus, section Batrachium) were used. The optimal fixation time for seedlings of Ranunculus spp. for counting the number of chromosomes is 9-10 a.m. The numbers of chromosomes for Potamogeton berchtoldii and Sagittaria natans were found for the first time in Yakutia.
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