What is this plant/weed called?

[h_redknap]

I went camping over the summer, and I found this plant/weed next to a lake close by to where I was staying. I never seen this before, it intrigued me so I took a picture of it...I was wondering if any one here could tell me what it's called. Thanks for your help

-Heather

I hope this image code works, if not I'll supply a link: [IMG]

link:

[Henriette Kress]

?id=2178Henriette

[Omelet]

But that's just a guess. :-) The roots have medicinal properties.