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Maybe a type of touch me not plant? Never seen anything like it in the area, doesn't mean they are not common-place. Tall, reed-like stems. surrounding water amongst bamboo and cat-tails.
Wetland
http://en.wikipedia.org/wiki/Mimosa_pudi... possibly something in this family? ..
This may be a "Hearts Delight"! They can come in white petals or pink petals!