The common toadflax (Linaria vulgaris) belongs to Scrophulariaceae (the Figwort family). It is a perennial herb that is native to most of Europe and northern Asia. It was introduced and is now common in North America and Japan. This herb grows along roads, in dunes, and on disturbed and cultivated land, and can reach about 50 cm in height. The leaves are glaucous blue-green, sessile and arranged in alternate. The flowers are pale yellow except for the lower lip which is orange, and bloom in dense terminal racemes from June to September. The fruit is a globose capsule, containing numerous small seeds.