On Aug 22, 11:23*pm, Stewart Robert Hinsley
wrote:
Perhaps a garden escape/throwout, as it's not readily recognisable as a
native species.

* * *http://www.stewart.hinsley.me.uk/Images/Dicot68a.jpg

Original photo (large)

* * *http://www.stewart.hinsley.me.uk/Images/IMG_6191.jpg
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Stewart Robert Hinsley

Canadian pondweed.
http://en.wikipedia.org/wiki/Canadian_Pond_Weed

It goes scraggy when in low light. ie Deep/muddy/green water