The Collaborative International Dictionary of English v.0.48:

Xerophyllum \Xe*ro"phyl*lum\, pr. n.
   A small genus of North American herbs having grasslike basal
   leaves: squaw grass; sometimes placed in family
   Melanthiaceae.

   Syn: genus Xerophyllum.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Xerophyllum
    n 1: small genus of North American herbs having grasslike basal
         leaves: squaw grass; sometimes placed in family
         Melanthiaceae [syn: Xerophyllum, genus Xerophyllum]