The Collaborative International Dictionary of English v.0.48:

Flaxweed \Flax"weed`\, n. (Bot.)
   See Toadflax.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Toadflax \Toad"flax`\, n. (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.
   [1913 Webster]