grindelia squarrosa, achillea millefolium, ambrosia artemisiifolia, cirsium arvense, lactuca serriola, pilosella echioides, artemisia absinthium, bromus tectorum, convolvulus arvensis, erigeron acris, euphorbia esula, galium humifusum, jacobaea erucifolia, lepidium ruderale, lotus corniculatus, odontites vulgaris, poa angustifolia, sisymbrium loeselii