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Sclerocactus wrightiae
''Sclerocactus wrightiae'' is a rare species of cactus known by the common names Wright's little barrel cactus〔Van Buren R, Cooper JG, Shultz LM, Harper KT. 2011. Woody Plants of Utah: A Field Guide with Identification Keys to Native and Naturalized Trees, Shrubs, Cacti, and Vines. Logan: Utah State University Press. 513 pp.〕 and Wright's fishhook cactus.
Dr. Lyman Benson named this species for North American cactus expert Dorde Wright Woodruff, who initially discovered it in 1961 and brought it to the attention of Dr. Benson.〔Benson LD. 1966. A review of Sclerocactus. Cactus and Succulent Journal 38(2):55-57. 〕 Dr. Benson and Ms. Woodruff later collaborated in connection with other ''Sclerocactus'' taxa in the Intermountain West.
==Distribution==
It is endemic to Utah in the United States, where it is known only from Emery, Sevier, Wayne, and Garfield Counties.〔USFWS. (''Sclerocactus wrightiae'' Five-year Review. ) August 2008.〕 It occurs at Capitol Reef National Park〔USFWS. (''Sclerocactus wrightiae'' Five-year Review. ) August 2008.〕 and the San Rafael Swell.〔(''Sclerocactus wrightiae''. ) Flora of North America.〕 It is numerous threats and is federally listed as an endangered species of the United States (listed under the Endangered Species Act on October 11, 1979).
This plant grows in shrublands on a specific type of soil. It is usually fine or sandy in texture and there is a large amount of material scattered on the land, including pebbles, gravel, and fossil oyster shells. An important component of the substrate is the cryptobiotic crust that lies on top. The cactus is absent from areas where this crust has been destroyed.〔
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