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Potamogetonaceae' includes 2 genera and ca 100 species distributed in temperate and tropical regions of World. The present paper deals with its 2 genera viz., POTAMOGETON L. including 17 species and 2 varieties and GROENLANGDIA GAY with 1 species represented in India. Key to genera, subgenera and species as well as necessary illustrations are given for clear identity. Short description of each species including its correct binomial, basionym if any and synonyms, morphological characters, phenology, distribution in India as well as world, ecological notes and uses if any are provided. Specimens examined and approved acronyms of the herbaria where the specimens are deposited are cited.
M. J. Kothari (Wed,) studied this question.
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