I have a polygon feature class of weeds. Each polygon represents the area of one weed species. There are many places where there are polygons on top of polygons because the area has several different weeds growing in the same area. I need ONE polygon for these overlapping areas and ONE field listing all the weed species in that area so infested acres are not double counted. So one area may have 4 overlapping polygons representing weeds A,B,C, and D. I want one polygon with one field attributed with A,B,C,D. And ideas?