medicago sativa, hordeum distichon, chenopodium album, matricaria chamomilla, apera spica-venti, capsella bursa-pastoris, erigeron canadensis, fallopia convolvulus, polygonum aviculare, solanum nigrum, sonchus oleraceus, viola arvensis, artemisia vulgaris, galinsoga quadriradiata, lepidium virginicum, stellaria media, veronica arvensis, crepis capillaris, echinochloa crus-galli, papaver rhoeas, urtica dioica