Cow Vetch

It was hard to choose between Cow vetch and American Vetch.

tocorpus,i will scan the other pictures to see if it has a hairy stem.
Your help in identification is greatly appreciated.

Possibly the Hairy Vetch,(Vicia villosa), Or Cow vetch(Vicia cracca) if it lacks a hairy stem

Thanks werdgent. the leaves do look like vetch.
It can be very puzzling so I really appreciate your help.

Maybe some type of vetch. Vicia genus.

http://en.wikipedia.org/wiki/Vicia

Maybe V. americana