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Arizona Pine The Arizona Pine {Pinus arizonica) is a medium-sized pine in northern Mexico, southeast Arizona, southwest New Mexico, and western Texas in the United States. It is a tree growing to 25-35 m tall, with a trunk diameter of up 1.2 m. The needles are in bundles of 3, 4, or 5, with 5-needle fascicles being the most prevalent. This variablity may be a sign of hybridization with the closely related Ponderosa Pine (Pinus ponderosa). The cones are single, paired, or in whorls of three, and 5-11 cm long. It has been thought to be a variant of Ponderosa Pine by some botanists in the past, but is now recognized as a distinct species by most authorities. Two varieties are described, possibly better treated as distinct species; see Ponderosa Pine for a table of characters: Another related pine, Cooper's Pine (Pinus cooperi) is also treated as a variety of Arizona Pine by some authors, as Pinus arizonica var. cooperi, but other authors regard this as a distinct species, more closely related to Hartweg's Pine (Pinus hartwegii). This pine is a source of construction timber, and is heavily harvested for firewood. Extensive cutting has reduced the formerly widespread Arizona Pine forests, particularly in Mexico. Pine, Arizona
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