"Mariposa" is Spanish for "Butterfly" and "Sego" is a Shoshonean word for "edible bulb".

    On May 17, 1806, near what is today Kamiah, Idaho, Meriwether Lewis collected for science the first plant of the genus that came to be called "Calochortus".  The plant was given to Frederick Pursh for analysis, he assigned the new genus name, and called the plant Calochortus elegans.

    The first Calochortus gunnisonii was collected in central Colorado in 1853 by Frederick Creutzfeldt, the botanist on the fatal Gunnison Expedition.  (Creuzefeldt, Gunnison, and seven other Gunnison expedition members were murdered in Utah.  More biographical information.)  The first C. flexuosus was collected by Ms. E. P. Thompson in Utah in 1872.  C. nuttallii was collected by Wyeth on his return home from his first western expedition in 1833 and the plant was at first named Calochortus luteus by Nuttall in 1834 but it was renamed Calochortus nuttallii by Torrey and Gray in 1854. 

     Many botanists still place Calochortus in Liliaceae (Lily Family), not in Calochortaceae (the Calochortus Family).

Semi-desert, desert.  Grasslands, shrublands, openings.  Spring.
Canyons of the Ancients National Monument, April 27, 2005.

Calochortus flexuosus is one of three lovely members of this genus that are abundant in the Four Corners area.  Calochortus flexuosus grows in the hot, dry areas of the lower elevations of the Four Corners.  Its lovely petals have a low band of yellow below petals that range from white to light lavender.  Stems flex and bend and leaves are wide and often have a distinctive curl.  Leaves may be present at flowering time or may have already withered.  Seeds are three winged.

Semi-desert, desert.  Grasslands, shrublands, openings.  Spring.
Canyons of the Ancients National Monument, April 5, 2005.

Semi-desert, desert.  Grasslands, shrublands, openings.  Spring.
Canyons of the Ancients National Monument, April 5, 2005 and April 27, 2007.
The Shiprock, New Mexico, May 7, 2007.

Beauty in bud and flower.  C. flexuosus and C. nuttallii often grow by the tens of thousands in a relatively small area.  In favorable years, many of these will flower.

Foothills, montane, subalpine.  Meadows.  Spring, summer.
Spring Creek Trail, Abajo Mountains, Utah, July 10, 2007.

Look for Calochortus gunnisonii from low foothills to high mountain meadows.  Its broad band of yellow hairs above an elliptically shaped glandular structure on each petal distinguish it from C. flexuosus and C. nuttallii.  It can be sparsely scattered or in extensive colonies.  In 2003 Calochortus gunnisonii had a massive flowering in the Four Corners: the low slopes of Mesa Verde National Park were dotted with thousands of these lovely plants.  Color is most often white, but the flower can have tinges of blue and pink.

This lovely flower is named for Captain J. W. Gunnison, 1812-1853, surveyor, explorer, and expedition leader who, with eight companions, was murdered in Utah just after finishing a railroad route survey.  Gunnison is honored in many names: Calochortus gunnisonii, Gunnison Grouse, the Gunnison River, the town of Gunnison, Colorado, etc. (More biographical information.)

Semi-desert, foothills.  Shrublands, woodlands, openings.  Spring, summer.
Canyons of the Ancients National Monument, June 12, 2005.

Calochortus nuttallii  inhabits a range between and overlapping the ranges of C. gunnisonii and C. flexuosus. 

Thomas Nuttall was an acclaimed Harvard Professor, naturalist, and explorer of the 19th century.  (More biographical information.).)

Semi-desert, foothills.  Shrublands, woodlands, openings.  Spring, summer.
Dolores Canyon Overlook Trail, June 19, 2008.

C. nuttallii is distinguished from C. gunnisonii by having a circular gland and a broken band of maroon above the gland  --  as well as by several other minute features.  Petals can be white to lavender.