The Collaborative International Dictionary of English v.0.48:

Leonurus \Leonurus\ n.
   A genus of stout Old World herbs having cut-lobed leaves and
   flowers in whorls.

   Syn: genus Leonurus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Leonurus
    n 1: genus of stout Old World herbs having flowers in whorls
         [syn: Leonurus, genus Leonurus]