Bachelor's Button, Bluebottle, Cornflower, Garden Cornflower - Centaurea cyanus
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Centaurea cyanus - Bachelor's Button, Bluebottle, Cornflower, Garden Cornflower. This introduced species was brought over to North America as an ornamental by immigrants from Europe, and is commonly cultivated. It is now found wild in every state except Alaska, and is also found in most of Canada. It is considered weedy or invasive by some authorities.
In its native southern Europe, this flower grows among the grainfield, giving it the "Cornflower" common name.
Found in:
AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY
Leave comments on Centaurea cyanus at this link. | 
Distribution of Centaurea cyanus in the United States and Canada:
Map courtesy of The Biota of North America Program.
Map color key
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| | Site: Boise Foothills, Ada County, ID Date: 2010-June-19 | Photographer: Gerald C. Williamson
Nikon D60
Tamron SP 90MM f/2.8 AF Macro | | Centaurea cyanus is a member of the Asteraceae family with only disk flowers. The outer disk flowers are enlarge and somewhat bell-shaped, with sharp-pointed lobes. more frequently blue | | 
| | Site: Boise Foothills, Ada County, ID Date: 2010-June-19 | Photographer: Gerald C Williamson
Nikon D60 | | The blossoms of Bachelor's Button are more commonly blue than other colors. | | Click on the photo for a larger image
| | Site: Pioneer Cemetery, Horshoe Bend, ID Date: 2010-June-17 | Photographer: Gerald C Williamson
Nikon D60 | | While blue is the most common color, this photo shows some of the wide variety of colors of this flower. | | Click on the photo for a larger image
| | Site: Pioneer Cemetery, Horshoe Bend, ID Date: 2010-June-17 | Photographer: Gerald C Williamson
Nikon D60 | | The inner florets vary in color as well. | | Click on the photo for a larger image
| | Site: Pioneer Cemetery, Horshoe Bend, ID Date: 2010-June-17 | Photographer: Gerald C Williamson
Nikon D60 | | The inner florets vary in color as well. | | Click on the photo for a larger image
| | Site: Boise Foothills, Ada County, ID Date: 2010-June-19 | Photographer: Gerald C Williamson
Nikon D60 | | Bachelor's Buttons can turn an entire field blue. Here highlighted by white Bachelor's Buttons and other white wildflowers. | | Click on the photo for a larger image
| | Site: Pioneer Cemetery, Horshoe Bend, ID Date: 2010-June-17 | Photographer: Gerald C Williamson
Nikon D60 | | | | Click on the photo for a larger image
| | Site: Watauga County, NC Date: 2016-June-04 | Photographer: Dave Fairall
Canon Powershot SX50 HS | | A photo of a Bachelor's Button "back east" - by permission of Dave Fairall. | | Click on the photo for a larger image
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