The Collaborative International Dictionary of English v.0.48:

camash \camash\ n.
   same as camass.

   Syn: camas, camass, quamash, camosh.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

camash
    n 1: any of several plants of the genus Camassia; North and
         South America [syn: camas, camass, quamash, camosh,
         camash]