plant called common arrowhead, sagittaria sagittifolia

plant arrowhead sagittaria sagittifolia nature leaves outdoor blooming water aquatic flora botany flowers common flower bog vegetation pink color northeast europe fresh reservoir backwash swamp hydrophilic hydrophyte fen bloom mire marshland estuary helium hydrophytic plants european slow current macrophyte wapato thickets oldworld braided river accretion silt slack lentic backwater blossom delta unripe fruits sludge setting