Hairy vetch is common around here too.

http://www.agry.purdue.edu/ext/forag...airy_vetch.htm

At times when I' ve bought uncertified oats, I' ve got hairy vetch with the seed. Its a gooe legume, and does add somw N to the soil - Deer seem to prefer it less than clover or other more traditional deer plots - but will eat it and obtain 10-15% protein as a result. - I would not plant it over clover for a plot. - but if you had a steep bank, or other wise inaccessable area, its a good choice.