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Calochortus nuttallii facts for kids

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Sego lily
Sego lily cm.jpg
Scientific classification
  • Calochortus luteus Nutt. 1834, illegitimate homonym not Douglas ex Lindl. 1833
  • Calochortus watsonii M.E.Jones
  • Calochortus rhodothecus Clokey
Calochortus nuttallii Sego lily Utah
Near Kolob Canyon in Zion National Park, Utah

Calochortus nuttallii — known as sego lily — is a bulbous perennial which is endemic to the Western United States.

It is the state flower of Utah.


The plant is native to a number of western states, being found throughout Utah and Wyoming, large parts of eastern Nevada, and parts of Idaho, Montana, North Dakota, South Dakota, Nebraska, Colorado, Arizona, and New Mexico.


Sego or Mariposa Lily (NGM XXXI p512)
Painting by Mary E. Eaton

Calochortus nuttallii are around 15–45 cm (6–18 inches) in height and have linear leaves.

Plants have 1 to 4 flowers, each with 3 white petals (and 3 sepals) which are tinged with lilac (occasionally magenta) and have a purplish band radiating from the yellow base. A yellow petaled form with deep purple bands is known from Petrified Forest National Park. The yellow petaled form was also observed in a "super bloom" near the Orange Cliffs District of Glen Canyon National Recreation Area, on the north side of the Colorado River near Hite, Utah in May 2019. The plant blooms in early summer, with flowers that can be up to 3 inches across.


Calochortus nuttallii is a species within the genus Calochortus, in a sub-group generally referred to as Mariposa Lilies. The specific epithet nuttallii, named for the English botanist and zoologist, Thomas Nuttall, was ascribed to the species by the American botanists John Torrey and Asa Gray when it was officially described in 1857.

Former varieties

A number of former varieties of Calochortus nuttallii have been reclassified as distinct species:



Native Americans had culinary uses for the bulbs, seeds, and flowers of the plant. Bulbs were roasted, boiled, or made into a porridge by the Hopi, Havasupai, Navajo, Southern Paiute, Gosiute, and Ute peoples. The Hopi used the yellow flower ceremonially.

The Shoshone taught the Mormon pioneer immigrants to use the bulb for badly needed food. This resulted in the sego lily being formally designated as the Utah State Flower in 1911. Sego is derived from the Shoshone word seego. The sego lily was commemorated by the Sego Lily Dam, a flood-prevention infrastructure project in the shape of a giant sego lily, built in Sugar House Park in Salt Lake City in 2017.


Calochortus nuttallii is cultivated as an ornamental plant for its attractive tulip-shaped flowers and to attract/support native pollinator species. It prefers a deep, sandy soil with good drainage, and is cold-hardy. Plants can be propagated from newly formed bulblets which take two years to flower.

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