polygonum aviculare, sclerochloa dura, capsella bursa-pastoris, conium maculatum, convolvulus arvensis, cynodon dactylon, descurainia sophia, erigeron canadensis, hordeum murinum, lepidium draba, lolium perenne, lotus corniculatus, malva pusilla, matricaria chamomilla, medicago lupulina, plantago major, poa annua, sonchus oleraceus, trifolium pratense