centaurea montana mountain cornflower blue purple flowers in bloom, knapweed bluet flowering plant

alpine angustifolia asteraceae bachelor bachelors blooming blossom blossoming blue bluet botanic botanical botany bouquet bunch button centaurea closeup cornflower cyanus daylight detail flora floral flower flowering flowers foliage green group growth head knapweed leaf macro mollis montana montanus mountain nature ornamental outdoors perennial plant purple summer wild