polygonum aviculare, lolium perenne, achillea millefolium, amaranthus retroflexus, plantago major, convolvulus arvensis, erigeron canadensis, hordeum murinum, poa annua, anthemis cotula, bromus tectorum, cichorium intybus, festuca pulchra, lepidium perfoliatum, malva neglecta, plantago lanceolata, poa compressa, sclerochloa dura, verbena officinalis