|Scientific Name:||Turbinicarpus laui|
|Species Authority:||Glass & R.A.Foster|
Pediocactus laui (Glass & R.A.Foster) Halda
|Taxonomic Notes:||Accepted as a valid species by Anderson (2001) and Hunt (1999). Some hobbyists refer to the genus as Gymnocactus. Anderson et al. (1994) indicate that T. laui may be part of clinal variation within T. knuthianus, if so the latter has priority.|
|Red List Category & Criteria:||Critically Endangered B2ab(iii,v) ver 3.1|
|Assessor(s):||Fitz Maurice, W.A., Sotomayor, M., Smith, M. & Fitz Maurice, B|
|Reviewer(s):||Superina, M. & Goettsch, B.K.|
There are six known disjunct subpopulations of Turbinicarpus laui, which are distributed over an area of 250 km² (extent of occurrence) and add up to an area of occupancy of less than 5 km². The population of about 4,000 mature individuals is severely fragmented and is suffering from a continuing decline due to illegal collecting and fires. Its distribution is highly dependent on edaphic conditions. The type locality appears to have been quarried for limestone at some point in the past, but it seems unlikely that quarrying would be reactivated. Hence, the species is listed as Endangered under criterion B1ab(iii,v).
|Range Description:||This species occurs in the Cerritos and Villa Juárez Municipalities, San Luis Potosí, Mexico at about 1,000 m asl. Six disjunct subpopulations are known in a restricted area of about 250 km² and an area of occupancy of less than 5 km². There are about 6 known localities, which comprise 5 locations.|
Native:Mexico (San Luis Potosí)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The total population is estimated to comprise 4,000 mature individuals.|
|Habitat and Ecology:||This cactus grows in semi-desert (Chihuahuan Desert, although not typical) among bare areas with Helieta parvifolia and Ptelea trifoliata as neighboring vegetation. It occurs on gypsum-calcareous or gypsum soils (a stenoendemic). One of the localities is characterized by massive, dark-colored limestone rocks (Anderson et al. 1994). The habitat is locally classified as matorral submontano (Rzedowski 1965).|
|Use and Trade:||This species is grown in cultivation as an ornamental.|
|Major Threat(s):||Illegal collecting and fires are the major threats. The type locality has been quarried for limestone in the past, but it seems unlikely that this would be reactivated. There is intense road construction in the area. One of the areas where there is a hybrid between this species and T. pseudopectinatus was destroyed by urban expansion (housing).|
This cactus is listed on CITES Appendix I, but the laws governing imports in the countries of destination need to be enforced. This species is widely propagated, yet the demand for field collected plants remains. It does not occur in any protected area.
The 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 the category “subject to special protection” (Pr; SEMARNAT 2010).
The Cadereyta Regional Botanic Gardens has developed a universal technique to reproduce species of the genus Turbinicarpus (including Gymnocactus), with a rate of 5x/4 weeks and 95% soil adaptation success (E. Sánchez pers. comm. 2011).
|Citation:||Fitz Maurice, W.A., Sotomayor, M., Smith, M. & Fitz Maurice, B 2013. Turbinicarpus laui. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 31 August 2015.|
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