Wordnet 3.0
NOUN (1)
1. 
 any of several plants of the genus Gutierrezia having tiny flower heads that resemble the heads of matches; 
[syn: matchweed, matchbush]
The Collaborative International Dictionary of English v.0.48:
matchbush \match"bush`\ n.
   any of several plants of the genus Gutierrezia having tiny
   matchlike flowerheads.
   Syn: matchweed.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
matchbush
    n 1: any of several plants of the genus Gutierrezia having tiny
         flower heads that resemble the heads of matches [syn:
         matchweed, matchbush]