*butter-and-egg*

n.(Bot.), a name given to several perennial plants having showy flowers of two shades of yellow, or of yellow and orange, such as Narcissus incomparabilis in Europe, and the toadflax (Linaria vulgaris) in the United States; the latter is a naturalized weed in North America.
Syn. -- toadflax, wild snapdragon, devil's flax, Linaria vulgaris. [ 1913 Webster + WordNet 1.5 ]