chenopodium album, erigeron sumatrensis, erigeron canadensis, amaranthus retroflexus, anchusa hybrida, carduus pycnocephalus, fumaria officinalis, helminthotheca echioides, hordeum murinum, lolium perenne, malva sylvestris, melilotus albus, mercurialis annua, picris hieracioides, piptatherum miliaceum, polygonum aviculare, scolymus hispanicus, sonchus tenerrimus, trisetaria panicea