blueweed

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A biennial Eurasian plant (Echium vulgare) naturalized as a weed in eastern North America and having usually blue flowers.

Century Dictionary and Cyclopedia

1. n. The viper's bugloss, Echium vulgare, a foreign weed with showy blue flowers which has been introduced into the United States.
2. n. A cæsal piniaceous plant, Hoffmanseggia stricta, introduced from Mexico into Texas in alkali soils and regarded as a pest, though its tubers are eaten by hogs and its foliage, in dry seasons, by cattle. It is the camote del raton of the Mexicans.

GNU Webster's 1913

1. n. a coarse prickly European weed (Echium vulgare) with spikes of blue flowers; naturalized in the U. S.

WordNet 3.0

1. n. a coarse prickly European weed with spikes of blue flowers; naturalized in United States