centaurea montana perennial mountain cornflower in bloom, cultivated white montane knapweed bluet amethyst snow flowering plant

amethyst asteraceae barchelor barchelors beautiful bloom blooming blossom blossoming bluet botanic botanical botany bouquet bright bunch button centaurea closeup cornflower cultivar daylight detail flora floral flower flowers foliage garden green group growth knapweed leaf macro montana montane mountain nature ornamental outdoors perennial plant snow snowy sunlight sunny white