Centaurea montana (perennial cornflower, mountain cornflower, bachelor's button, montane knapweed or mountain bluet) is a species of Centaurea endemic to Europe. It is widespread and common in the more southerly mountain ranges of Europe, but is rarer in the north. It escapes from gardens readily, and has thereby become established in the British Isles, Scandinavia and North America.
Cornflower like, bright blue flowers with fringed rays spaced apart; pinkish center; black fringed bracts. Bloom April-June. Whole plant is lightly hairy. Fringed bracts similar to spotted knapweed. Grow to 80cm (2.6 ft).
2020-21: https://inaturalist.ca/observations?project_id=69401&taxon_id=48984&place_id=any&verifiable=any
2019-20: https://inaturalist.ca/observations?project_id=38602&taxon_id=48984&place_id=any&verifiable=any