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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Abies hidalgensis Debreczy, Rácz & Guizar

Endemic to the State of Hidalgo in eastern Mexico where fire is a potential threat to the small population Read full species entry >

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Cupressus arizonica var. montana (Wiggins) Little

Endemic to Baja California in Mexico where the main threat is likely to be from an increase in the severity and frequency of fires due to fire suppression policies, coupled with the likely impacts of climate change. Read full species entry >

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Cupressus arizonica var. nevadensis (Abrams) Little

Endemic to the USA in southern California and threatened mainly by fire Read full species entry >

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Cupressus arizonica var. stephensonii (C.B.Wolf) Little

Endemic to the US-Mexican border where fire is a major threat Read full species entry >

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Cupressus goveniana Gordon

Endemic to California, USA where it is facing a range of threats including changes to fire regimes, urbanisation, invasive non-native plants and agriculture. Read full species entry >

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Cupressus goveniana var. abramsiana (C.B.Wolf) Little

Endemic to California, USA where fire and urbanisation are the mian threats Read full species entry >

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Cupressus goveniana var. goveniana

Endemic to California, USA where altered fire regimes and ubanisation are the main threats Read full species entry >

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Cupressus guadalupensis S.Watson

Endemic to Baja California, Mexico and the border area of California, USA. Threatened by fire and urbanisation. Read full species entry >

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