I have this thorny thing coming up in areas that I cleaned of other weeds. Right now they are about 10" high and they have a low growing, upright habit (I have seen them grown before). The thorns are about 1/4" or longer and they are straight. It has purple flowers with a bright yellow inside and the leaves have kind of a ruffle on the edge and are 1-3" long. Anyone know what that might be? Later I'll post a link to a pic.