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Content tagged with "weed"

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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Photo of tall fescue plants

Tall Fescue

Festuca arundinacea
You’ve seen it a million times, now learn to identify it! Technically an exotic invasive plant, tall fescue is practically everywhere, from lawns to levees, and from pastures to (unfortunately!) prairies.

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Photo of tall fescue flowers

Tall Fescue (Flowers)

Tall fescue’s branching flowering stalks are somewhat narrow and contracted to slightly spreading, usually 2-10 inches long, and often nodding at the top. Flowers occur in flat, oval spikelets that are 1/4 to 1/2 inch long. There are usually 4-5 individual flowers in each spikelet. It blooms April through July (sometimes to October).

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Photo of tall fescue plants

Tall Fescue (Plants)

You’ve seen it a million times! Technically an exotic invasive plant, tall fescue is practically everywhere, from lawns to levees, and from pastures to (unfortunately!) prairies.

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Photo of cut-leaved teasel showing flowerhead and joined, cuplike leaves.

Teasels

Dipsacus fullonum and Dipsacus laciniatus
“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.

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Thunberg’s Lespedeza (Shrub Lespedeza; Pink Bush Clover)

Lespedeza thunbergii
Thunberg’s lespedeza is a large, non-woody perennial shrub often cultivated as a showy, flowering ornamental. It sometimes escapes from cultivation and naturalizes in Missouri landscapes.

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Photo of western goat's beard or salsify flower

Western Goat’s Beard (Western Salsify; Wild Oyster Plant)

Tragopogon dubius
With its yellow composite flowers and round seedheads of fluffy “parachutes,” goat’s beard looks like a gigantic dandelion. A native of Europe, many people view it as an invasive weed.

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Photo of western goat's beard or salsify flower

Western Goat’s Beard (Western Salsify; Wild Oyster Plant) (Flower)

Western goat’s beard is a smooth, hairless annual or biennial with one to several fleshy stalks. The flowerheads are surrounded by narrow green bracts, which are longer than the yellow ray florets. The stems are considerably thickened just below the flowerheads, which are large and showy but close by noon on sunny days.

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Photo of western goat's beard or salsify seedhead

Western Goat’s Beard (Western Salsify; Wild Oyster Plant) (Seedhead)

With its yellow composite flowers and round seedheads of fluffy “parachutes,” goat’s beard looks like a gigantic dandelion. A native of Europe, many people view it as an invasive weed.

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Photo of white sweet clover flower cluster showing stalk and flowers.

White and Yellow Sweet Clovers

Melilotus albus and M. officinale
These two species of sweet clover are present all over America. Although they have been planted for forage, as bee plants, and as nitrogen-fixers, white and yellow sweet clover are now classified as invasive for their weediness and the problems they pose for natural habitats.

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