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Pinus leiophylla var. chihuahuana
http://www.fs.fed.us/database/feis/plants/tree/pinleic/
Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
Pinus leiophylla var. chihuahuana
http://www.botanik.uni-bonn.de/conifers/pi/pin/leiophyz.htm
Description of the Chihuahua Pine.