Opuntia megarrhiza Rose is a species of plant in the family Cactaceae. It is endemic to the state of San Luís Potosí in northeastern Mexico.H.M. Hernández, C. Gómez-Hinostrosa, & R.T. Barcenas. 2001. Studies on Mexican Cacti II: Opuntia megarrhiza, a poorly known endemic from San Luís Potosí, México. Brittonia 528-533.
Distribution and habitat It is known only from five populations, around the summits of La Trinidad and Álvarez Mountain Ranges, in San Luis Potosí, northeastern Mexico. Its natural habitat is subtropical or tropical dry lowland grassland.
It is an endangered species, threatened by habitat loss, grazing, and harvest for traditional medicinal uses.
Synonyms Opuntia megarrhiza Rose, Contr. U.S. Natl. Herb. 10:126. 1906.Rose, Contr. U.S. Natl. Herb. 10:126. 1906 Opuntia macrorhiza var. potosina Hernández-Valencia, Acta Cientifica Potosina 10:155-162. 1988.Hernández-Valencia, Acta Cientifica Potosina 10:155-162. 1988.
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