[Wikipedia] Europe, Siberia, Central Asia native: Linaria vulgaris, the common toadflax,[1][2] yellow toadflax or butter-and-eggs,[3] is a species of flowering plant in the family Plantaginaceae, native to Europe, Siberia and Central Asia.[4] It has also been introduced and is now common in North America. (link added by Mary Ann Machi)

[www.invasivespeciesinfo.gov] Invasiveness: Native to Europe, Yellow toadflax and Dalmatian toadflax can typically be found on roadsides, grasslands and in crop fields. Like many other weeds, toadflaxes have been introduced to North America as decorative plants but they are now having adverse effects. Whilst these weeds may look pretty and provide decorative appeal, they soon escape cultivation and can cause some serious problems. (link added by Mary Ann Machi)