Common Name

Scientific Name

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Photo by Ben Franklin
Photo Courtesy of Utah Division of Wildlife Resources

Siler pincushion cactus, Pediocactus sileri, is a Federally listed threatened plant that occurs in Kane and Washington counties, Utah, and adjacent Coconino and Mohave counties, Arizona; the center of its distribution is in Mohave County. A member of the cactus family, this species is a small, globose cactus with solitary, occasionally clustered, stems typically 10 cm tall (as great as 45 cm), and spines that become white with age. Its flowers are yellow with purple veins, and bloom during March and April (May). Siler pincushion cactus is found on the white, occasionally red, gypsiferous and calcareous sandy or clay soils derived from the various members of the Moenkopi Formation. It is sometimes found, however, on the nearly identical Kaibab Formation. Siler pincushion cactus occurs on rolling hills, often with a badlands appearance, in warm desert shrub, sagebrush-grass, and, at its upper limits, pinyon-juniper communities, at elevations ranging from 805 to 1650 meters. This species and its habitat are vulnerable to disturbance from off-road vehicle use, trampling by livestock, and possibly mining.


  • U. S. Fish and Wildlife Service. 1986. Recovery plan for the Siler pincushion cactus (Pediocactus sileri). USDI Fish and Wildlife Service, Albuquerque, NM. 57 pp.

  • Hughes, L.E. 1987. Final: Siler pincushion cactus Habitat Management Plan (HMP). USDI Bureau of Land Management, Arizona Strip District, AZ, and Cedar City District, UT. 16 pp. + appendix.

  • Hreha, A.M. and T. Meyer. 1994. Distribution and demographic study of Pediocactus sileri (Engelm.) L. Benson on the Cedar City BLM District, Washington and Kane Counties, Southern Utah. Prepared for USDI Bureau of Land Management, Utah State Office, Salt Lake City. Red Butte Garden and Arboretum, Salt Lake City, UT. 54 pp. + appendices.