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Centaurea cyanus L.
CORNFLOWER
Garden cornflower

Life   Plantae   Dicotyledoneae   Asteraceae   Centaurea

Centaurea cyanus, whole plant - in flower - general view
© Copyright Steve Baskauf, 2002-2011 · 4
Centaurea cyanus, whole plant - in flower - general view

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Centaurea cyanus, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Centaurea cyanus, inflorescence - whole - unspecified
Centaurea cyanus, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Centaurea cyanus, inflorescence - whole - unspecified

Centaurea cyanus, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Centaurea cyanus, stem - showing leaf bases
Centaurea cyanus, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Centaurea cyanus, leaf - basal or on lower stem

Centaurea cyanus, leaf - on upper stem
© Copyright Steve Baskauf, 2002-2011 · 4
Centaurea cyanus, leaf - on upper stem
Centaurea cyanus
© Copyright Bobby Hattaway 2011 · 3
Centaurea cyanus

Centaurea cyanus, seed
© Copyright Seeds USID 2015 · 1
Centaurea cyanus, seed
Centaurea cyanus
© Copyright Malcolm Storey 2011-2117 · 1
Centaurea cyanus

Centaurea cyanus
© Copyright Malcolm Storey 2011-2117 · 1
Centaurea cyanus
Centaurea cyanus, flower
© Kay Yatskievych, 2003 · 1
Centaurea cyanus, flower

Associates · map
FamilyScientific name @ source (records)
Andrenidae  Perdita octomaculata @ CUIC_ENT (2)
Aphididae  Brachycaudus ( @ AMNH_PBI (1)

Prociphilus ( @ NCSU (1)
Apidae  Bombus ashtoni @ AMNH_BEE (1)

Bombus citrinus @ CUIC_ENT (3)

Bombus griseocollis @ I_HHGA (2)

Bombus pensylvanicus @ AMNH_BEE (1)

Bombus ternarius @ AMNH_BEE (1)

Bombus terricola @ AMNH_BEE (1)

Melissodes desponsa @ CUIC_ENT (1)

Triepeolus remigatus @ UCMS_ENT (5)
Coccinellidae  Hippodamia convergens @ I_LB (1)
Colletidae  Colletes kincaidii @ CUIC_ENT (1)
Halictidae  Agapostemon virescens @ CUIC_ENT (4)

Lasioglossum inconditum @ CUIC_ENT (1)

Lasioglossum zonulum @ CUIC_ENT (1)
Megachilidae  Coelioxys alternata @ CUIC_ENT (1)

Megachile centuncularis @ I_HHGA (1); AMNH_BEE (1); CUIC_ENT (1)

Megachile gemula @ CUIC_ENT (1)

Megachile latimanus @ CUIC_ENT (6)

Megachile relativa @ CUIC_ENT (3)

Pseudoanthidium nanum @ I_HHGA (6)
Membracidae  Entylia carinata @ NCSU (2)
Miridae  Orthocephalus bivittatus @ AMNH_PBI (3)
Mycosphaerellaceae  Cercospora centaureae @ BPI (1)

Septoria centaureicola @ BPI (1)

Septoria chrysanthemella @ BPI (2)

Septoria cyani @ BPI (1)

Septoria @ BPI (2)
Peronosporaceae  Bremia lactucae @ BPI (11)
Pucciniaceae  Puccinia centaureae @ BPI (2)

Puccinia cyani @ BPI (111); 061637A (1); 061637B (1)

Puccinia obliqua @ BPI (1)

Puccinia suaveolens @ BPI (1)

Puccinia @ BPI (1)

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Following modified from MissouriPlants.com
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Centaurea cyanus L. - Cornflower, Bachelor's Buttons, Blue Bottle

Centaurea cyanus plant

Family - Asteraceae

Stems - To 1m tall, tomentose to arachnoid pubescent, herbaceous.

Centaurea cyanus stem Stem close-up.

Leaves - Alternate. Cauline leaves linear, entire, arachnoid pubescent, to +10cm long, +5mm wide.

Inflorescence - Single flower head terminating branches.

Involucre - Involucre to 1.5cm tall, imbricate, phyllaries with fimbriate margins.

Centaurea cyanus involucre Involucre.

Ray flowers - Absent.

Disc flowers - Corolla typically blue-purple but other colors in cultivated varieties, marginal flowers sterile. inner flowers smaller, fertile. Achenes to 4mm long. Pappus of capillary bristles.

Centaurea cyanus flowers Disk flowers.

Centaurea cyanus flowers Light pink form.

Flowering - May - September.

Habitat - Prairies, waste ground, roadsides, railroads. Also cultivated.

Origin - Native to Europe.

Other info. - This plant is heavily cultivated and escaped to a variety of locations. The disk flowers can be blue-purple, white, or pink. The plant is commonly used in dried flower arrangements.

Photographs taken at Schumaker Park, 6-16-99 and 7-12-00, and by Tom's Creek, NC., 4-20-03.


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Following modified from Plants Database, United States Department of Agriculture
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Following modified from CalPhotos
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Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Centaurea+cyanus+cv.&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Centaurea+cyanus+cv.&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
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Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Centaurea+cyanus+var.+alba&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Centaurea+cyanus+var.+alba&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
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Updated: 2017-11-18 12:31:47 gmt
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