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Houndstongue

St. Johnswort

Diffuse Knapweed

Russian Knapweed

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Purple Loosestrife

Perennial Pepperweed

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Dalmatian Toadflax

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Houndstongue
Cynoglossum officinale
 
Rosette

Basal leaves are about three inches wide with a hairy surface. Upper leaves are narrower, about one inch wide and have a curled appearance, and partially clasp the stem.
Adult

Houndstongue is a one to four foot tall biennial.
Flower

Small reddish purple flowers form in the upper portions of the plant along stems borne in leaf axils. Bloom is in early summer.
Weed Infestation

Houndstongue is a native of Europe. It thrives in disturbed soils along roadsides, trails, in pastures, and rangelands. Because of the bur-like seed, it spreads widely along travel corridors as a passenger on clothing or animal fur. It is toxic to livestock.
Seed Burs

Each flower produces four green bur-like fruits that turn brown as they mature.
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