The Collaborative International Dictionary of English v.0.48:

Layia \Layia\ n.
   A genus of Western U. S. annuals with showy yellow or white
   flowers.

   Syn: genus Layia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Layia
    n 1: genus of western United States annuals with showy yellow or
         white flowers [syn: Layia, genus Layia]