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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Juniperus comitana Martínez

Distributed in southern Mexico and northern Guatemala where it is under threat from deforestation for agricultural purpose and for timber Read full species entry >

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Juniperus deppeana var. robusta Martínez

Distributed in northern Mexico where threats include unsustainable logging, grazing by goats and general environmental degradation Read full species entry >

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Juniperus deppeana var. sperryi Correll

Endemic to northern Mexico and southern USA where there are very few locations which are threatened by grazing and fire Read full species entry >

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Juniperus deppeana var. zacatecensis Martínez

Endemic to northwestern Mexico where it is threatened by logging, land clearance for agricultural purposes and livestock grazing Read full species entry >

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Juniperus flaccida var. martinezii (Pérez de la Rosa) Silba

Distributed in several States across central Mexico where threats include land clearance for agriculture, grazing by goats and fire Read full species entry >

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Juniperus jaliscana Martínez

Distributed in three States of northern Mexico here it is threatened by forest clearance for agriculture and farming, fire is also a threat Read full species entry >

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Juniperus saltillensis M.T.Hall

Distributed in northern Mexico and in decline due to intensive grazing and deforestation for agricultural purposes. Read full species entry >

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Picea chihuahuana Martínez

Endemic to México where it is severely fragmented due to deforestation and increasingly threatened by poor regeneration as well as warming and drying associated with climate change. Read full species entry >

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