henbit

Lamium amplexicaule L.

Description from Invasive.org

Appearance
Lamium amplexicaule is is a cool season annual weed in the mint family (Lamiaceae). It has square stems that reach 6-15 in. in height. Unlike many plants in the mint family, henbit does not have a strong or distinctive odor. Henbit has a fibrous root system.
Foliage
Leaves on the stem that are not associated with flowers have petioles. Upper leaves have no petioles and occur just below flower clusters. Both types of leaves are somewhat rounded, coarsely toothed, and occur in pairs on opposite sides of the stem.
Flowers
Flowers are about 1 1/2 inches long, purple, and have hairy bracts.
Fruit
Seeds are found in nutlike fruits (mericarps) and are light to dark brown.
Ecological Threat
Lamium amplexicaule can be found in thrives in cool, moist areas and occurs in yards, parks, roadsides, fallow fields, winter grain crops, pastures, and turf grass. It can be highly competitive in newly seeded areas. Lamium amplexicaule has been found to be an overwintering host for soybean cyst nematode. it is also an alternative host for corn earworm.

Selected Images from Invasive.org

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Plant(s)
John D. Byrd, Mississippi State University, Bugwood.org
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Plant(s)
John D. Byrd, Mississippi State University, Bugwood.org
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Flower(s)
Steve Dewey, Utah State University, Bugwood.org
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Plant(s)
Steve Dewey, Utah State University, Bugwood.org
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Flower(s)
Steve Dewey, Utah State University, Bugwood.org
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Seedling(s)
Steve Dewey, Utah State University, Bugwood.org
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Seedling(s)
Ohio State Weed Lab , The Ohio State University, Bugwood.org
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Fruit(s) Ventral view of two nutlets. Elaiosome at bottom.
D. Walters and C. Southwick, USDA, Bugwood.org
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Distribution