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Stenarmen ved Mariager, Danmark
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Long-beaked arrowhead (Sagittaria longirostra). Found in swamps and along ponds, New Jersey and Pennsylvania to Alabama (After Britton & Brown)
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Potamogeton americanus, spray showing attachment of cases of caddis fly (fam. Leptoceridae).
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Potamogeton obtusifolius, winter buds. October.
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Potamogeton Robbinsii, photo-micrograph of section through old stem, showing arrangement of mechanical tissue.
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Water plantain (Alisma Plantago-aquatica). Found in shallow water or mud throughout North America. Also in Europe and Asia (After Britton & Brown)
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Field of Phyllospadix scouleri.
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Waterweek (Philotria canadensis). Found nearly throughout North America, except extreme north (After Britton & Brown)
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Leafy pondweed (Potamogeton foliosus). Niagra Falls to Michigan and California (After Britton & Brown)
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Warner Parks Nature Center, Nashville, Davidson County, Tennessee, US
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Species: Potamogeton nodosus Poir. Date: 2006-09-24 Location: Small dam in forest off the Woodland Rd, Vumba Habitat: In the water; spikes emergent
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Species: Monstera deliciosa Liebm. Date: 2009-01-06 Location: Crocodile Farm, Kariba Habitat: Garden
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Fussing Sø, Randers, Jylland, Danmark
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Hobro
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Suserup Skov, Midtsjælland
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Amossen, Öland, Sverige
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Skjern Å ved Skjern, Jylland, Danmark
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Aptera, E of Chania, Greece
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Subbæk Vandmølle ved Viborg, Danmark
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Uggerby Strand, Nordjylland, Danmark
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Nørreå, Fladbro, Randers
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Skjern Å, Søndre parallelkanal.
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Nors Sø, NV-Jylland, Danmark
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Sverige, Halland, Grimeton, Skärsjön