text: sisymbrium officinale, chenopodium album, convolvulus arvensis, erigeron canadensis, polygonum aviculare, senecio vulgaris, sonchus asper, achillea millefolium, ballota nigra, capsella bursa-pastoris, crepis capillaris, elymus repens, euphorbia peplus, lamium purpureum, medicago lupulina, melilotus officinalis, plantago major, poa annua, sonchus arvensis