fresh-water soldier flower

helium accretion silt aquatic plant vegetation backwash backwater bloom blossom body cutting bog botany braided river dioecious flowers environment estuary european fen flora flower fresh reservoir water freshwater soldier land leaf cuts lentic macrophyte male marsh marshland men mire noncirculating obliteration lakes quagmire delta slack slow current sludge setting slushing stagnation stratiotes aloides swamp wetland