|Scientific Name:||Obregonia denegrii|
|Taxonomic Source(s):||Hunt, D., Taylor, N. and Charles, G. (compilers and editors). 2006. The New Cactus Lexicon. dh Books, Milborne Port, UK.|
|Taxonomic Notes:||Accepted as a valid species by Anderson (2001) and Hunt (1999).|
|Red List Category & Criteria:||Endangered B1ab(iii,v)+2ab(iii,v) ver 3.1|
|Assessor(s):||Gómez-Hinostrosa, C. & Guadalupe Martínez, J.|
|Reviewer(s):||Superina, M., Goettsch, B.K. & Chanson, J.S.|
Obregonia denegrii is considered to be Endangered due to a very small geographic range (extent of occurrence ca 2,000 km2) and ongoing declines due to illegal overcollecting and habitat modification due to grazing. The area of occupancy is estimated to be 350 km² and there are no more than five subpopulations, all of them are found in one location. The population consists of less than 5,000 plants, and it continues to decrease due to collecting.
|Previously published Red List assessments:|
|Range Description:||This species is endemic to the Mexican state of Tamaulipas. It occurs at an altitude of about 1,000 m asl.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||W.A. and B. Fitz Maurice (pers. comm. 2009) have visited the population three times. The total population is estimated to have decreased by about 50% in the past 50 years. The current population is estimated to be about 5,000 individuals.|
This species has been the object of several surveys during the past 20 years. An international team sponsored by WWF studied it in 1986 (Anderson et al. 1994), and a CITES-funded project monitored a major population in the early 1990s (Cante and Desert Botanical Garden 1997).
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||This cactus grows in semi-desert (or Tamaulipan Shrubland according to Anderson et al. (1994)), in the Valley of Jaumave. The generation length is 10 years.|
|Continuing decline in area, extent and/or quality of habitat:||Yes|
|Generation Length (years):||10|
|Use and Trade:||This species is illegally collected as an ornamental and is also widely cultivated. It is collected by local people for medicinal purposes (used to treat rheumatism).|
|Major Threat(s):||Erosion is being accelerated by the grazing activities of livestock, and uprooted plants have been recorded as a result (Anderson et al. 1994). Illegal commercial collecting and collecting by local people affect some subpopulations. Road construction and urban development at one site may also pose a threat.|
The species is listed on CITES Appendix I, but the laws governing imports in the countries of destination need to be enforced. The species is widely propagated.
A micropropagation technique is under development at the Cadereyta Regional Botanical Garden (E. Sánchez pers. comm. 2011).
This species is legally protected in Mexico by the national list of species at risk of extinction, NOM-059-SEMARNAT-2010, where it is listed under category “threatened” (A; SEMARNAT 2010).
|Citation:||Gómez-Hinostrosa, C. & Guadalupe Martínez, J. 2013. Obregonia denegrii. The IUCN Red List of Threatened Species 2013: e.T40968A2948122.Downloaded on 27 August 2016.|
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