The Collaborative International Dictionary of English v.0.48:

Mentzelia \Mentzelia\ prop. n.
   A genus of bristly herbs or subshrubs of Western America
   lacking stinging hairs.

   Syn: genus Mentzelia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mentzelia
    n 1: genus of bristly herbs or subshrubs of western America
         lacking stinging hairs [syn: Mentzelia, genus
         Mentzelia]