common teasel

Dipsacus fullonum L.

Description from Invasive.org

Appearance
Dipsacus fullonum a biennial plant that exists as a basal rosette until flower stems develop.
Foliage
Rosette leaves are lanceolate to oblanceolate and stem leaves are opposite, lanceolate and fused at the base. All leaves have short prickles on the midvein.
Flowers
The erect flower stems reach 6 ft. (1.8 m) in height and support spiny flower heads that are covered with small, lavender to white flowers in April to September.
Fruit
Fruit is angled and approximately 0.08-0.12 in. (2-3 mm) long. Seeds are small and are dispersed by the wind after the seed-head has dried.
Ecological Threat
Dipsacus fullonum favors disturbed sites such as roadsides, ditches, waste places, riparian sites, fields and pastures in most of the continental United States. Only recently was Dipsacus fullonum distinguished from fullers teasel which was once cultivated for the dried flower heads used in wool processing. It is native to Europe.

Resources

Selected Images from Invasive.org

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Steve Dewey, Utah State University, Bugwood.org
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Infestation
John M. Randall, The Nature Conservancy, Bugwood.org
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Plant(s) Rosettes
Steve Dewey, Utah State University, Bugwood.org
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Foliage
Steve Dewey, Utah State University, Bugwood.org
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Flower(s)
Steve Dewey, Utah State University, Bugwood.org
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Infestation
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage
Plant(s) in flower
Steve Dewey, Utah State University, Bugwood.org
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Infestation
Steve Dewey, Utah State University, Bugwood.org
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Flower(s) Old seed head
Steve Dewey, Utah State University, Bugwood.org
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Plant(s)
David Cappaert, , Bugwood.org
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Flower(s)
David Cappaert, , Bugwood.org
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Plant(s) Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 289.
USDA NRCS PLANTS Database , USDA NRCS PLANTS Database, Bugwood.org
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Seed(s)
Steve Hurst, USDA NRCS PLANTS Database, Bugwood.org
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Distribution