Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Hartweg's Pine (Pinus hartwegii; syn. P. rudis, P. donnell-smithii) is a pine native to the mountains of Mexico and Central America east to Honduras. It is a very high altitude species, growing at altitudes of 2500-4300 m, and forms the alpine tree line on most of Mexico's higher mountains. It is named after Karl Theodor Hartweg, who discovered it in 1838. It grows on both mountain ranges Sierra Madre Occidental and Sierra Madre Oriental (29° North latitude) from Chihuahua State and Nuevo Leon (26°) to the highest peaks on the Mountains of El Salvador- Honduras border (15° North latitude).

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