WordNet (r) 3.0 (2006):

sego lily
    n 1: perennial plant having clusters of one to four showy white
         bell-shaped flowers atop erect unbranched stems; edible
         bulbs useful in times of scarcity; eastern Montana and
         western North Dakota south to northern Arizona and
         northwestern New Mexico [syn: sego lily, Calochortus
         nuttallii]