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yellow toadflax (Linaria vulgaris)
 ODA rating: B
USDA Symbol: LIVU2
Oregon yellow toadflax distribution
Other common names
butter and eggs
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  Images courtesy of Weed Science Society of America.
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Perennial; blooms summer and fall. Grows 1 to 2 ft tall. Leaves pale green, narrow and pointed at both ends. Flowers orange and yellow and snapdragon-like.
Yellow toadflax is a potential weed problem in zero and minimum till areas because of its prolific seed production and creeping rhizome. It is an aggressive weed in rangeland where it quickly replaces grasses and herbs. It is an alternate host for tobacco mosaic virus. Some sources report that toadflax is poisonous to cattle.
Introduced as a ornamental in the United States in the mid-1800's. This invader is still occasionally found in wildflower seed mixes. This plant can be found throughout the U.S.
Distribution in Oregon
The first documented site in Oregon was 1880 in Multnomah County.

Biological controls
Seven biological control agents are approved for release. Three of these have been successfully established in Oregon: a flower-feeding beetle, a seed capsule weevil and a stem weevil.