grindelia squarrosa, ambrosia artemisiifolia, erigeron canadensis, achillea millefolium, artemisia absinthium, cirsium arvense, linaria genistifolia, tanacetum vulgare, capsella bursa-pastoris, carduus acanthoides, cichorium intybus, convolvulus arvensis, melilotus albus, poa angustifolia, sisymbrium loeselii, descurainia sophia, melilotus officinalis, verbascum lychnitis