Northern Mexico / SW USA

The Mexican and southwest USA Threatened Conifer Region stretches from central southern California south to the Guatemalan border. In the north a broadly Mediterranean climate prevails with summer droughts a major limiting factor. In Mexico, conifers occur in a range of climates that include cold subalpine areas of the highest volcanoes and the lush, lowland tropical forests. Most species are found in the pine-oak woodlands that once covered extensive areas of the many mountain ranges in Mexico.  This region is important for conifer diversity and is the main centre for the genus Pinus with over 50 species which represents 50% of all known species. Unfortunately this region has the highest number of threatened taxa with more than 60  mostly being threatened mainly by widespread over-exploitation, fire and the conversion of forests for agriculture. Many species are narrow endemics of relictual origin with small populations close to the tops of mountains. These taxa are particularly vulnerable to the impacts of changes to precipitation associated with climate change. 

Taxa in the category - Northern Mexico / SW USA :

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Picea martinezii T.F.Patterson

Only known from six stands in the Sierra Madre Oriental in México where it is threatened by logging Read full species entry >

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Picea mexicana Martínez

Native to northern México where it has been reduced by 50% since 1950 mainly as a result of logging, grazing and fire. Read full species entry >

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Pinus arizonica var. stormiae Martínez

Endemic to northern Mexico where many years of logging has caused a decline of mature individuals Read full species entry >

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Pinus cembroides subsp. lagunae (Rob.-Pass.) D.K.Bailey

Endemic to Baja California in Mexico. The small population is vulnerable to fire and grazing Read full species entry >

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Pinus cembroides subsp. orizabensis D.K.Bailey

Endemic to a small part of eastern Mexico where its habitat is being encroached by agricultural activities Read full species entry >

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Pinus culminicola Andresen & Beaman

Endemic to a few mountain summits in northeastern Mexico where it is severely fragmented and threatened by fire Read full species entry >

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Pinus greggii var. australis Donahue, Jeffrey K. & Lopez A.,R.

Endemic to east-central Mexico where this species is severely fragmented due to deforestation, fire, grazing and agricultural activities Read full species entry >

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Pinus maximartinezii Rzed.

Endemic to two locations in northern Mexico where the main threats are grazing by livestock and fire Read full species entry >

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