Abstract
The present communcation gives cytological data of four taxa covering the families Butomaceae and Hydrocharitaceae. Two cytotypes were noticed in Butomus umbellatus (2n=26, 39). While the basic karyotype in these two taxa was unaltered, there was distinct difference in the size of chromosomes. Polymorphism in respect of chromosome size was noticed in Hydrilla verticillata and Hydrocharis dubia in the populations inhabiting different lakes.
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