carduus nutans, trifolium repens, arenaria serpyllifolia, capsella bursa-pastoris, cirsium arvense, cirsium vulgare, crepis foetida, cynodon dactylon, descurainia sophia, erigeron canadensis, geranium pusillum, lactuca saligna, lactuca serriola, lepidium ruderale, lolium perenne, lotus corniculatus, medicago lupulina, plantago lanceolata, poa annua, polygonum aviculare, xanthium spinosum