Waterwort
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Elatine hexandra
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July-August
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This grows as an annual on exposed mud at the edge of lakes, reservoirs, ponds and flooded gravel-pits, or submerged on open substrates in shallow, oligotrophic to eutrophic water. When submerged it may sometimes persist as a short-lived perennial. Like many species in this habitat, it is subject to large annual fluctuations in numbers. 0-440 m (Lake Ferta, N. Kerry), and reportedly to 490 m in the Scottish Highlands.
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