What is a liliaceous plant (Calochortus Nuttallii) of Western North America, and its edible bulb; -- so called by the Ute Indians and the Mormons called?

sego — A liliaceous plant (Calochortus Nuttallii) of Western North America, and its edible bulb; -- so called by the Ute Indians and the Mormons. (Webster's 1913.)

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