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Members of Pondweed family are perennial, aquatic herbs, usually found in fresh or salty water rather than swamps. Plants are submerged or submerged and floating, often with narrow leaves underwater and broad leaves on the surface. Flowers are bisexual or rarely unisexual. There are 4 sepals, 0 petals, 4 stamens, and typically 4 (rarely 1) simple pistils, which are positioned superior, each maturing as a single, dry seed (an achene), or sometimes as a drupe (a berry with a stony seed) or nutlet.
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