close-up of a white cornflower with a pink center

close white cornflower pink center closeup flower blue jacea purple knapweed blooming blossom plant summer bloom flora floral nature wild centaurea green brownknapweed centaureajacea thistle wildflower botany natural outdoor beautiful decoration environment grass petal botanist undesirableplant grow carderbee chlorophyll tare sun bush bluet fragrance centaury bud dustymiller leaves season