I used the edit function. Hopefully it should work now. If not, you can reach it at: http://www.rosebreeders.org/forum/read.php?2,52924

I hope someone here on GW knows the answer! I too have these plants (weeds?) and at first I let them grow, bloom and set seeds. The next year I had tons of them, so I immediately pulled started them all up. What is interesting is that the foliage looks like it belongs to the hibiscus family.

Look up web pictures of the various pea-family members. There's quite a lot of them. You're on the right track in that this is surely one of them. I'm still picking out what's what in that tribe so I don't feel qualified to ID your plant, at least based on those pics. Mountian pea, uh....see, I can't even remember the names....but there are some natives in that bunch. There're also more non-native, invasive types besides crown vetch. I think we see one around here called cow vetch which does all the same things. But I'd look to some web-based picture collections to home in on this one. +oM

That looks about right - thank you!