The Collaborative International Dictionary of English v.0.48:

Lavandula \Lavandula\ n.
   A genus of plants of the mint family including the
   lavender[1].

   Syn: genus Lavandula.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Lavandula
    n 1: lavender [syn: Lavandula, genus Lavandula]