Abstract
Kolleru lake is a large fresh water body extending over 850 sq. km in the Krishna and West Godavari districts of Andhra Pradesh, between 81°40' and 80°20' E and 17°25' and 1.6°28' N. The entire lake being shallow, has only littoral vegetation with practically no limnetic and profoundal zones. As the lake receives rich nutrients as effluents from the several drains that empty into it, the vegetation is luxuriant. About nineteen species of hydrophytes belonging to thirteen angiosperm families are recorded. Data on the distribution of these hydrophytes in the lake and their frequency, relative frequency and abundance from different regions of the lake at different periods of the year, are presented.
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