'Linaria' was derived from the Latin 'linon' or 'linum', which means flax, because the foliage looks similar to that of flax.
'Toadflax' refers to the resemblance of the flowers to toads and the foliage to flax.
'Butter-and-eggs' refers to the yellow and orange color of the flowers.
Toadflax has been used medicinally to treat various ailments. Teas and lotions made from the foliage were used to treat such complaints as constipation, jaundice, insect bites, and throat problems.
Toadflax was widely used to make yellow dye.
According to Scottish superstition, walking around toadflax 3 times will unbind any spell, and the English believed that 3 toadflax seeds strung on linen thread would ward off evil.