Esthwaite Waterweed
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Elodea nuttallii
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Flowers not yet observed in Britain
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Like E. canadensis, this perennial herb is found in still or slowly flowing, shallow or deep water. It appears to be more restricted to eutrophic water than its congener, and it may be frequent even in highly disturbed canals and rivers. It is an effective coloniser of new habitats, despite the fact that it must spread vegetatively as all plants in our area are female. 0-315 m (Bethania, Cards.).
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Frog-Bit
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Hydrocharis morsus-ranae
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July-August
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The floating rosettes of this perennial are found in shallow, calcareous, mesotrophic or meso-eutrophic water in the sheltered bays of lakes or in ponds, canals and ditches. Reproduction is primarily vegetative; viable seed is sometimes set, but seedlings are probably rare. Lowland.
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