sego lily

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A western North American bulbous plant (Calochortus nuttallii) having large white to lavender cup-shaped flowers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun 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