XVI International Botanical Congess
Macrophytes (M) are abundant at the Sea of Japan basin (SJB): 275 spp., both in freshwater and saline habitats, especially, Monocots (181 spp., from many families). Chromosome studies reveal for Calla palustris again 2n=36 in SJB, that differs from European populations, with 2n=72. In Thacla natans 2n=32 of the E Asian populations differs from the Canadian plants (2n=16). For polymorphic Ranunculus sceleratus only 2n=56 is still known on the Russian Far East, that is considerably different of the data reported from outside. First data were obtained for Eleocharis ussuriensis, Cardamine mandshurica, the new, diploid, race - in Lobelia sessilifolia (2n=14), near sea coast. These data may be useful for possible taxonomic conclusions. A check-list of M on SJB, chromosome numbers including, is compiled.