Content tagged with "thistle"

Bull Thistle

Photo of bull thistle, a spiny thistle with a pink flowerhead
Bull thistle is a weedy introduction from Europe, found statewide. To tell it from our other thistles, note its stems with spiny-margined wings, and its leaves with the upper surface strongly roughened with stiff, spiny bristles. More

Bull Thistle

Photo of bull thistle, a spiny thistle with a pink flowerhead
Cirsium vulgare
Bull thistle is a weedy introduction from Europe, found statewide. To tell it from our other thistles, note its stems with spiny-margined wings, and its leaves with the upper surface strongly roughened with stiff, spiny bristles. More

Canada Thistle

Photo of Canada thistle flowers
Canada thistle is a native to Eurasia and arrived on our continent probably before the Revolutionary War—most likely mixed in agricultural seed. A bad weed of crop fields and rangeland farther north, it causes problems in Missouri, too. More

Canada Thistle

Photo of Canada thistle flowers
Cirsium arvense
Canada thistle is a native to Eurasia and arrived on our continent probably before the Revolutionary War—most likely mixed in agricultural seed. A bad weed of crop fields and rangeland farther north, it causes problems in Missouri, too. More

Common Teasel

Photo of common teasel flowering heads
Dipsacus fullonum
“Infestation” is the term for what teasels are doing in Missouri. Learn to identify these thistlelike plants, and help to control the weedy spread of these tough, prickly invaders. More

Common Teasel

Photo of common teasel flowering heads
“Infestation” is the term for what teasels are doing in Missouri. Learn to identify these thistlelike plants, and help to control the weedy spread of these tough, prickly invaders. More

Cornflower (Bachelor’s Button) (Flowerhead)

Photo of a cornflower, closeup of a 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. More

Cornflower (Bachelor’s Button; Blue Bottle)

Photo of a cluster of blooming cornflower plants.
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! More

Cornflower (Bachelor’s Button; Blue Bottle)

Photo of a cornflower, closeup of a flowerhead.
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! More

Cut-Leaved Teasel

Photo of cut-leaved teasel plants with flowering heads
Cut-leaved teasel (Dipsacus laciniatus) is similar to common teasel, only it has white (not lilac or lavender) flowers, blooms July through September (not June through October), and has irregularly pinnately lobed upper stem leaves (common teasel’s upper stem leaves are lance-shaped and scalloped, but not lobed). Cut-leaved teasel is more aggressive than common teasel and has severely threatened several northern and central Illinois natural areas. More