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Peter M Greenwood: Egeria densa Planchon - Large-flowered Waterweed
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Peter M Greenwood: Lagarosiphon major Ridl. Moss ex Wager - Curly Waterweed
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Peter M Greenwood: Elodea canadensis Michx. - Canadian Pondweed
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Peter M Greenwood: Elodea canadensis Michx. - Canadian Pondweed