Here are some pictures of the Enemies to help you out:

                           category 1:

                Public Enemy #1- spotted knapweed (Centaurea maculosa) spotted.gif (78160 bytes)(1)

                Public Enemy #2- Russian knapweed (Centaurea repens) russian.gif (75270 bytes)(1)

                Public Enemy #3- diffuse knapweed (Centaurea repens) diffknap.gif (84516 bytes)(1)

                Public Enemy #4- Dalmatian toadflax (Linaria dalmatica) daltoadf.gif (65906 bytes)(1)

                Public Enemy #5- St. Johnswort (Hypericum perforatum) stjohn.gif (87720 bytes)(1)

                Public Enemy #6- Canada thistle (Cirsium arvense)
                Public Enemy #7- sulfur cinquefoil (Potentilla recta)

                Public Enemy #8- field bindweed (Convolvulus arvensis) (1)

                Public Enemy #9- leafy spurge (Euphorbia esula) lsplant1.gif (79373 bytes)(1)

                Public Enemy #10- whitetop (Cardaria draba)

 

                            category 2:

                Publica Enemy #1- dyers woad (Isatis tinctoria) dyerwoad.gif (70515 bytes)(1)

                Public Enemy #2- purple loosestrife (Lythrum salicaria) purloose.gif (68425 bytes)(1)

 

                                category 3:

                Public Enemy #1- yellow starthistle (Centaurea solstitialis)starthis.gif (76149 bytes)(1) 

                Public Enemy #2- common crupina (Crupina vulgaris)

                Public Enemy #3- rush skeletonweed (Chondrilla  juncea)

                Here is the site where I found some of my pictures for this page:

                    (1)-http://www.co.larimer.co.us/depts/pubwor/weeds/30weeds/thirty30.htm