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It is a perennial plant with short spreading roots, erect to decumbent stems 15–90 cm high, with fine, threadlike, glaucous blue-green leaves 2–6 cm long and 1–5 mm broad. The flowers are similar to those of the snapdragon, 25–33 mm long, pale yellow except for the lower lip which is orange, borne in dense terminal racemes from mid summer to mid autumn. The fruit is a globose capsule 5–11 mm long and 5–7 mm broad, containing numerous small seeds.
Linaria vulgaris (Common Toadflax, Yellow Toadflax, or Butter-and-eggs) is a species of toadflax (Linaria), native to most of Europe and northern Asia, from the United Kingdom south to Spain in the west, and east to eastern Siberia and western China. It has also been introduced and is now common in North America.