cyanus segetum, centaurea cyanus - cornflower, bachelor's button

39aph39 achelor agricultural america annual asteraceae australia bachelor barley blossom broad button centaurea contaminant corn cornfields cornflower crop cyanus endangered europe family field flower flowering food gardens grains grass grassland green grew habitat herb herbicides including intensification introduction meadow name native naturalised nature north oats ornamental over-use parts petal plant prairie produce referring rye s seed seeds segetum sense vegetable weed wheat wildflower world