toadflax

[tohd-flaks]
noun
1.
a common European plant, Linaria vulgaris, of the figwort family, having narrow leaves and showy yellow-and-orange flowers, naturalized as a weed in the U.S.
2.
any plant of the same genus.

Origin:
1570–80; toad + flax

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World English Dictionary
toadflax (ˈtəʊdˌflæks)
 
n
Also called: butter-and-eggs any of various scrophulariaceous plants of the genus Linaria, esp L. vulgaris, having narrow leaves and spurred two-lipped yellow-orange flowers

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

toadflax

any member of a genus (Linaria) of nearly 150 herbaceous plants native to the North Temperate Zone, particularly the Mediterranean region. The common name refers to their flaxlike leaves; the flowers are two-lipped and spurred like snapdragons. Among the prominent members are common toadflax, or butter-and-eggs (L. vulgaris), with yellow and orange flower parts. Native to Eurasia, it is now widely naturalized in North America. Blue, or old-field, toadflax (L. canadensis) is a delicate light-blue flowering plant found throughout North America. From North Africa come the cloven-lip toadflax (L. bipartita) and purple-net toadflax (L. reticulata), both of which have purple and orange bicoloured flowers

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Yellow toadflax is a member of the snapdragon family and is easily recognized by the bright yellow flowers.
Hybrid toadflax plants also fixed photosynthate at a higher rate throughout the growing season.
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