A profile of the potential flora in maize fields of the Po Valley

amaranthus anagallis arvensis chenopodium chenopodium album comunidades vegetales echinochloa crus-galli echinochloa frumentacea ecologia vegetal flora flore graine italia italie italy malezas mauvaise herbe plant communities plant ecology polygonaceae polygonum lapathifolium polygonum persicaria primulaceae seeds semilla stellaria stellaria media weeds zea mays