Thought it was some sort pondweed but after looking at all the pondweed photos that doesn't appear to be it. I am looking to eradicate about 1/2 of it and leave the remainder. That may be a difficult proposition so if it all goes hopefully something more native will come back. I haven't seen this weed in many if any of the local ponds. It is intermixed with what I call saw grass which I also want to get rid of. I tried puling it out but it really is rough and cuts your hands badly. Any ideas what these are? The first two photos are what it looks like a week after being cut down. the last few photos are what it looks like after it starts to develop seed heads or flowers. http://www.msnusers.com/FOZZYBEARSAV/ppondweeds.msnw?Page=1

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Its how well you look doing it!