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Hem ved Mariager, Jylland, Danmark
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Hem, Mariager, Jylland, Danmark
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Botanisk hage, Cagliari, Sardinien
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Sverige, Norbotten, Kalix ved Bottenviken
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Sverige, Gotland
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Staksrode Skov, Vejle, Jylland, Danmark
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Have Randers
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Jardin des Plantes, Paris
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Botanisk Have Århus
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Oxford Botanical Garden United Kingdom
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Botanisk Have Århus
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Møn, Danmark
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Listed, Bornholm, Denmark
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Nötbrunskäret, Jordtorpsåsen, Öland, Sverige
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Ålbæk Enge ved Lønborg Hede, Jylland, Danmark
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Lille Vildmose, Denmark
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Botanisk Have Århus
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California Death Valley National Park, USA
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Eastfield College, Mesquite, TX
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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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Needle spike-rush (Eleocharis avicularis). Found in wet soil throughout North America, except in extreme north. Also in Europe and Asia (After Britton & Brown)
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Mandioca or Cassava.
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Three stages in the growth of Pteroceras rugosum Sowb., E. Indies, showing the development of the "fingers".