The Collaborative International Dictionary
Calochortus Nuttallii
Sego \Se"go\, n. (Bot.) A liliaceous plant ( Calochortus Nuttallii) of Western North America, and its edible bulb; -- so called by the Ute Indians and the Mormons.
Wikipedia
Calochortus nuttallii
Calochortus nuttallii, with the common name sego lily, is a bulbous perennial which is endemic to the Western United States.
It is the state flower of Utah.