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Content tagged with "knapweed"

Photo of a cornflower, closeup of a flowerhead.

Cornflower (Bachelor’s Button) (Flowerhead)

A member of the thistle tribe of composites, cornflower lacks true ray florets; instead, the outer florets of each head have enlarged, flaring corolla tubes that at a glance look something like the strap-shaped extensions of true ray florets.

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Photo of a cluster of blooming cornflower plants.

Cornflower (Bachelor’s Button; Blue Bottle)

A native of Europe, cornflower is a popular garden flower that often escapes to nearby areas. It’s used in bridal bouquets and men’s boutonnieres. Its intense blue color appears in boxes of crayons!

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Photo of a cornflower, closeup of a flowerhead.

Cornflower (Bachelor’s Button; Blue Bottle)

Centaurea cyanus
A native of Europe, cornflower is a popular garden flower that often escapes to nearby areas. It’s used in bridal bouquets and men’s boutonnieres. Its intense blue color appears in boxes of crayons!

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Photo of spotted knapweed flower head showing spots on involucral bracts

Spotted Knapweed

Centaurea stoebe
Spotted knapweed is an invasive plant that outcompetes native communities, takes over pastureland, and even beats back invasive sericea lespedeza! It has arrived in our state. Let’s prevent its spread.

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Photo of spotted knapweed flower head showing spots on involucral bracts

Spotted Knapweed (Flower)

The black, arrow-shaped spot on each bract gives spotted knapweed its common name.

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Photo of spotted knapweed plant showing foliage and growth habit

Spotted Knapweed (Leaves)

A single spotted knapweed plant can have a single stem or as many as 20 stems. It usually flowers in the second year, producing branched stems. The leaves are alternate, deeply lobed, and pale blue-gray.

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Use this print-and-carry sheet to identify and control noxious spotted knapweed on your Missouri property.

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Photo of spotted knapweed rosette, formed in the first year of growth

Spotted Knapweed Rosette

By the end of its first year, a knapweed plant is a small basal rosette. It usually bolts in the second year, producing branched stems.

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