The Collaborative International Dictionary of English v.0.48:

Leontodon \Le*on"to*don\ (l[-e]*[o^]n"t[-o]*d[o^]n), n. [Gr.
   le`wn, le`ontos, lion + 'odoy`s, 'odo`ntos, tooth. Cf.
   Lion's-tooth, Dandelion.] (Bot.)
   A genus of liguliflorous composite plants, including the fall
   dandelion (Leontodon autumnale), and formerly the true
   dandelion; -- called also lion's tooth.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Leontodon
    n 1: hawkbit [syn: Leontodon, genus Leontodon]