The Collaborative International Dictionary of English v.0.48:

Atriplex \Atriplex\ n.
   a genus of plants of the goosefoot family (Chenopodiaceae);
   its members include species called orach and saltbush.

   Syn: genus Atriplex.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Atriplex
    n 1: orach; saltbush [syn: Atriplex, genus Atriplex]