To me, it kind of looks like Mexican Evening Primrose. Do a search for that and see if you think it is. Although, it is pretty, it is very invasive here in So. Cal.

Julie

Julie,

You're right! Looked up what you called it, and sure enough:

http://davesgarden.com/guides/pf/go/236/

That's it! The pics look exactly like what's in my yard. This stuff grows non-stop. I guess I'll keep pulling it up! Thanks for your help.