soliva sessilis, gamochaeta americana, poa annua, veronica arvensis, erigeron floribundus, lolium perenne, medicago lupulina, polycarpon tetraphyllum, sagina apetala, sherardia arvensis, trifolium repens, bellis perennis, capsella bursa-pastoris, cerastium glomeratum, erodium cicutarium, plantago coronopus, prunella vulgaris