amaranthus powellii, convolvulus arvensis, hordeum murinum, lolium perenne, capsella bursa-pastoris, erigeron canadensis, erodium cicutarium, stellaria media, atriplex sagittata, bromus tectorum, descurainia sophia, geranium pusillum, lactuca serriola, lamium amplexicaule, lamium purpureum, matricaria discoidea, papaver rhoeas, tripleurospermum inodorum, urtica urens, veronica polita, carduus acanthoides, ceratodon purpureus