The following Participating Institutions are custodians for this species in the CPC National Collection:
Red Butte Garden and Arboretum
The conservation of Pediocactus winkleri is fully sponsored.
Sylvia Torti contributed to this Plant Profile.
This rare cactus is considered endangered by the World Conservation Union (IUCN) and listed in Appendix I of the Convention on the International Trade in Endangered Species (CITES). In this designation, P. winkleri joins the ranks of other endangered species such as tigers, Asian elephants, chimpanzees and humpback whales. CITES was set up by the IUCN to address the international trade in wildlife, which processes billions of dollars annually while causing massive declines in the numbers of many species of animals and plants. CITES is a voluntary agreement among countries, and signatory countries to CITES ban commercial international trade in an agreed list of endangered species (Appendix I) and their products and by regulating and monitoring trade in others that might become endangered (Appendix II). Species that are on Appendix I, such as Pediocactus winkleri, are threatened with extinction and are or may be affected by international commercial trade. This and other Appendix I species cannot be traded internationally for commercial purposes. (USFWS 2002)
This small, subglobose to ovoid cactus produces large peach to pink flowers between March and May, depending on temperature and moisture. The cactus shrinks underground or back to the ground surface during the summer and winter months.
Distribution & Occurrence
This species grows in fine textured, mildly alkaline soils derived from siltstone and shale substrates of the Dakota formation, Brushy Basin member of the Morrison formation, and Emery sandstone of the Mancos formation. It occurs on benches, hill tops and gentle slopes, usually with southern exposure. Usually occurs in Atriplex (saltbush) dominated desert shrub communities. (USFWS 1998)
|Known from four populations, totaling about 20,000 individuals. Populations are widely separated on parcels of habitat between 2.4 acres and 48 acres in size. (USFWS 1998a)|
Conservation, Ecology & Research
Grazing and mining development could
Determine the taxonomic relationship between P. winkleri and D. despainii. (USFWS 1998)
Clayton, P.W; Hubstenberger, J.F.; Phillips, G.C.; Butler-Nance, S.A. 1990. Micropropagation of Members of the Cactaceae Subtribe Cactinae. Journal of the American Society for Horticultural Science. 115, 2: 337-343.
USFWS. 1993. Proposal to Determine the Plant Pediocactus winkleri (Winkler Cactus) to be an Endangered Species. Federal Register. 58, 192: 52059-52062.
USFWS. 1995. Availability of a Draft Recovery Plan for the Utah Pediocactus: San Rafael Cactus (Pediocactus despainii) and Winkler Cactus (Pediocactus winkleri) for Review and Comment. Federal Register. 60, 187: 49855-49856.
USFWS. 1998. Final Rule To Determine the Plant Pediocactus winkleri (Winkler Cactus) To Be a Threatened Species. Federal Register. 63, 161: 44587-44595.
USFWS. 1998. Reopening of the Comment Period on the Proposed Endangered Status and Notice of Availability of the Draft Conservation Agreement for Review and Comment for Pediocactus winkleri (Winkler cactus) in central Utah. Federal Register. 63, 119: 3390