Global Range: Definitely present in the Chisos Mountains, Big Bend National Park, Brewster County, Texas, where it appears to be "local" overall (Flora of North America Editorial Committee 2003) but reasonably common within the vegetation belts where it occurs; Anthony (1956) reports that it is "the most conspicuous and abundant cactus in encinal and montane belts from Upper Green Gulch all through the Basin and up the slopes of the higher peaks", and Powell and Weedin (2004) state that it is "common in the wooded areas". Also almost certainly found in the nearby Maderas del Carmen (igneous, wooded portion of the Sierra del Carmen) in Coahuila, Mexico (Ferguson 1986, cited in Powell and Weedin 2004). Beyond these known locations, the species may range more widely in both the United States and Mexico. Ferguson (1986, cited in Powell and Weedin 2004) notes that the species is "to be expected elsewhere in Mexico", while Powell and Weedin (2004) note that "the uncommon presence of certain yellow-spined prickly pears in the Davis, Guadalupe, and Franklin mountains suggests that O. chisosensis occurs outside the Chisos Mountains", although Ferguson (pers. comm., cited in Powell and Weedin 2004) speculates that those plants are not O. chisosensis.
Catalog Number: US 2346113
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): M. S. Anthony
Year Collected: 1948
Locality: Texas, United States, North America
- Isotype: Anthony, M. S. 1956. Amer. Midl. Naturalist. 55: 252.
Comments: Middle to upper slopes and canyons of desert mountains, in the encinal and montane vegetation belts. Often in oak-juniper-pinyon pine woodland communities, also found in mixed conifer forests and grassy meadows. 1600 - 2200 m.
Life History and Behavior
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
NatureServe Conservation Status
Rounded Global Status Rank: G3 - Vulnerable
Reasons: Known from the Chisos Mountains in Brewster County, Texas, where it appears to be "local" overall but reasonably common within the encinal and montane vegetation belts of these desert mountains. Also almost certainly found in the nearby Maderas del Carmen in Coahuila, Mexico. It is possible that this species ranges more widely in both the United States and Mexico, and additional range information is needed to clarify its status. Often occurs in oak-juniper-pinyon pine woodland communities and is also found in mixed conifer forests and grassy meadows from 1600 to 2200 m elevation.
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