Dictionary:

bugloss

  (byū'glôs', -glŏs')

Any of several usually hairy Old World plants, especially in the genera Anchusa, Brunnera, and Echium, having blue or violet flowers.

[Middle English buglosse, from Old French, from Late Latin būglōssa, from Latin būglōssos, from Greek bouglōssos : bous, ox + glōssa, tongue.]

The noun has 2 meanings:

Meaning #1: perennial or biennial herb cultivated for its delicate usually blue flowers
  Synonyms: alkanet, Anchusa officinalis

Meaning #2: widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
  Synonyms: oxtongue, bristly oxtongue, bitterweed, Picris echioides