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http://3.bp.blogspot.com/_gQJFyssdtaw/S1DoaVYvuxI/AAAAAAAAAXQ/Du21W0WsGO0/s1600-h/pondzones.jpg

https://www.lakelawnandpond.com/WeedItemGroups.aspx?weed=48



http://www.ucmp.berkeley.edu/glossary/gloss5/biome/aquatic.html