North American ID Help

[DandelionSea at aol_com]

I collected this from Shields Lake (in the Platte River watershed) in Lake 
Ann, Michigan, three days ago.  No Sagittaria species match this plant at all, 
and Vallisneria seems unlikely due to the short blades.  I also saw the plant 
in a few other local lakes, always found sympatrically with Najas flexilis.  
Anyone have any idea about native species with a red or wine red lanceolate 
blade that propogate mainly vegetatively by runners?

Pic:  http://photos.groups.aol.com/_img/gmdpics/O6aGFC/im000891.jpg

Thank you in advance for any help.

Brian Rippon