The Collaborative International Dictionary of English v.0.48:

Dendroaspis \Dendroaspis\ prop. n.
   a genus of African snakes comprising the mambas.

   Syn: Dendraspis, genus Dendroaspis, genus Dendroaspis.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Dendroaspis
    n 1: mambas [syn: Dendroaspis, genus Dendroaspis,
         Dendraspis, genus Dendraspis]