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BROAD-LEAVED PONDWEED Potamogeton natans (Potamogetonaceae) Aquatic. Freshwater perennial of still or slow-flowing water. FLOWERS are small, 4-parted and greenish; in 8cm-long spikes, on stalks rising above the water (May-Sep). FRUITS are round and short-beaked. FLOATING LEAVES are oval, up to 12cm long; stalk has flexible joint near blade. SUBMERGED LEAVES are long and narrow. STATUS-Widespread and common.