plant of southern and southeastern United States grown for its yellow flowers that can be dried
an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers
A small annual plant in the family Asteraceae, Centaurea cyanus, usually with bushy blue flowers which grows natively in European cornfields (i.e. wheatfields).
Of a blue colour, as that of the cornflower; cornflower blue.