The Collaborative International Dictionary of English v.0.48:

Bugloss \Bu"gloss\, n.; pl. Buglosses. [F. buglosse, L.
   buglossa, buglossus, fr. Gr. ? oxtongue ? ox + ? tongue.]
   (Bot.)
   A plant of the genus Anchusa, and especially the Anchusa
   officinalis, sometimes called alkanet; oxtongue.
   [1913 Webster]

   Small wild bugloss, the Asperugo procumbens and the
      Lycopsis arvensis.

   Viper's bugloss, a species of Echium.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bugloss
    n 1: perennial or biennial herb cultivated for its delicate
         usually blue flowers [syn: bugloss, alkanet, Anchusa
         officinalis]
    2: widespread European weed with spiny tongue-shaped leaves and
       yellow flowers; naturalized in United States [syn:
       oxtongue, bristly oxtongue, bitterweed, bugloss,
       Picris echioides]