text: hordeum vulgare, amaranthus retroflexus, calystegia sepium, chenopodium album, cirsium arvense, echinochloa crus-galli, elymus repens, euphorbia helioscopia, lolium perenne, persicaria maculosa, solanum nigrum, solanum tuberosum, sonchus arvensis, sonchus oleraceus, veronica persica, viola arvensis