xeranthemum annuum, descurainia sophia, lepidium draba, agropyron cristatum, bromus tectorum, capsella bursa-pastoris, centaurea diffusa, cichorium intybus, echium vulgare, hordeum murinum, lepidium campestre, matricaria chamomilla, melilotus albus, melilotus officinalis, poa angustifolia, polygonum aviculare, sisymbrium loeselii