Where has that boy been hiding? There's a couple ID's that could use his help!
During this time of the season, he's trying to pay the bills - and taxes.
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Not too sure of this ID since the OP's photos don't display key characteristics.
Without jumping to any conclusions, I'd ask if the plant in question resembles either photo-group shown below.
For future reference, these are the types of photos that are helpful for ID-purposes. Try to always have something in the photo for scale-reference. Show leaf-shape, size and marginal texture. Include close-ups that show how the leaves are attached and arranged along the stem relative to each other. Also include a wide-angle photo that depicts where and how the plant is growing within its primary habitat, especially in relation to the water's surface and shoreline.
