text: urtica urens, poa annua, atriplex prostrata, ballota nigra, carduus pycnocephalus, carduus tenuiflorus, convolvulus arvensis, crepis bursifolia, echium vulgare, euphorbia helioscopia, heliotropium europaeum, hordeum murinum, hyoscyamus niger, lobularia maritima, marrubium vulgare, onopordum illyricum, polygonum aviculare, rostraria cristata, rumex pulcher, silybum marianum