yellow toadflax

Linaria vulgaris P. Mill.

Description from Invasive.org

Appearance
Linaria vulgaris is a perennial herb that can reach 3.3 ft. (1 m) tall with erect, smooth stems that emerge in clumps from a spreading root system.
Foliage
Leaves are nearly sessile, drooping, linear and 1-2 in. (2.5-5 cm) long. Leaves can sometimes be sparsely covered by long hairs.
Flowers
Flowering occurs from May to September, when yellow/white, snapdragon-like flowers develop. Flowers, including the spur, are 0.6-1.2 in. (1.5-3 cm) long and occur in racemes at the apex of the stems.
Fruit
Fruits are capsules that are 0.4-0.5 in. (9-12 mm) long. Each capsule contains small, flat blackish seeds with a papery wing.
Ecological Threat
Linaria vulgaris occurs in fields, pastures, roadsides, undisturbed prairies and rangelands. It is native to Europe and was introduced into North America, as an ornamental, in the mid 1600s.

Resources


Selected Images from Invasive.org

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Plant(s) in flower
Linda Wilson, University of Idaho, Bugwood.org
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Flower(s)
Michael Shephard, USDA Forest Service, Bugwood.org
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Foliage view from above
John Cardina, The Ohio State University, Bugwood.org
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Fruit(s)
John Cardina, The Ohio State University, Bugwood.org
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Plant(s) side view of clump of plants in flower
Dave Powell, USDA Forest Service (retired), Bugwood.org
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Flower(s) Montana
Wendy VanDyk Evans, , Bugwood.org
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Flower(s)
Caleb Slemmons, National Ecological Observatory Network, Bugwood.org
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Plant(s)
Elizabeth Bella, AECOM, Bugwood.org
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Plant(s)
Steve Dewey, Utah State University, Bugwood.org
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Infestation
Steve Dewey, Utah State University, Bugwood.org
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Root(s) Roots
Steve Dewey, Utah State University, Bugwood.org
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Plant(s) Field of flowers, Routt NF, CO
William M. Ciesla, Forest Health Management International, Bugwood.org
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Infestation
Steve Dewey, Utah State University, Bugwood.org
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Seedling(s) Along with dandelion rosettes
Elizabeth Bella, AECOM, Bugwood.org
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Fruit(s) fruit and seeds
Ken Chamberlain, The Ohio State University, Bugwood.org
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Seed(s)
Steve Hurst, USDA NRCS PLANTS Database, 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: 177.
USDA NRCS PLANTS Database , USDA NRCS PLANTS Database, Bugwood.org
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Distribution