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Webster 1913 Edition

Noun.

(Bot.)

An herb (

Linaria vulgaris

) of the Figwort family, having narrow leaves and showy orange and yellow flowers; – called also

butter and eggs

flaxweed

, and

ramsted

toadflax ‎(plural toadflaxes)

Any of several European plants, of the genus Linaria, having two-lipped yellow flowers.
- 2010, Clare Vanderpool, Moon Over Manifest
  One morning she had me traipsing out at the crack of dawn for prickly poppy, toadflax, spiderwort, and skeleton weed. If that doesn't sound like the makings of a witch's brew, then I'm the queen of England.
Any of several other plants in the family Plantaginaceae.

plant of the genus Linaria