text: erigeron canadensis, arenaria serpyllifolia, bromus tectorum, cerastium semidecandrum, medicago lupulina, achillea millefolium, brassica napus, bromus sterilis, cirsium arvense, rumex acetosa, senecio vernalis, sonchus oleraceus, hypericum perforatum, jacobaea vulgaris, solidago gigantea, tragopogon pratensis