- Types:
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Potamogeton crispus, curled leaf pondweed, curly pondweed
European herb naturalized in the eastern United States and California
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Potamogeton gramineous, variously-leaved pondweed
of Europe (except the Mediterranean area) and the northern United States
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Potamogeton americanus, Potamogeton nodosus, loddon pondweed
pondweed with floating leaves; of northern United States and Europe
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frog's lettuce
very similar to Potamogeton; of western Africa, Asia, and Europe
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Zannichellia palustris, horned pondweed
found in still or slow-moving fresh or brackish water; useful to oxygenate cool water ponds and aquaria