Irish wildflowers sitemap
Photos: Rinecaha, the Burren 
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Fen Pondweed Very small flowers with four perianth segments and stamens. Separate carpels ripening to small nutlets. Narrow submerged leaves. Floating leaves are oval to elliptical-lanceolate, +/- translucent with clearly visible cross-veins. Occurs in shallow water in calcareous fens and peaty ditches. Most frequent in central Ireland. Similar: Bog Pondweed, P. polygonifolius 
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Fen Pondweed, Potamogeton coloratus. The Burren, July 2009
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