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The Single-leaf Pinyon (Pinus monophylla) is a pine in the pinyon pine group, native to the United...

The Single-leaf Pinyon (Pinus monophylla) is a pine in the pinyon pine group, native to the United States and northwest Mexico. The range is in southernmost Idaho, western Utah, Arizona, southwest New Mexico, Nevada, eastern and southern California and northern Baja California. It occurs at moderate altitudes from 1200-2300 m, rarely as low as 950 m and as high as 2900 m. It is widespread and often abundant in this region, forming extensive open woodlands, often mixed with junipers.It is the world's only 1-needled pine. It is a small to medium size tree, reaching 10-20 m tall and with a trunk diameter of up to 80 cm, rarely more. The bark is irregularly furrowed and scaly. The leaves ('needles') are, uniquely for a pine, usually single (not two or more in a fascicle, though trees with needles in pairs are found occasionally), stout, 4-6 cm long, and grey-green to strongly glaucous blue-green, with stomata over the whole needle surface (and on both inner and outer surfaces of paired needles). The cones are acute-globose, the largest of the true pinyons, 4.5-8 cm long and broad when closed, green at first, ripening yellow-buff when 18–20 months old, with only a small number of very