History
Orizaba Pinyon is the most recent pinyon pine to be described, discovered by Dana K. Bailey in 1983 when examining an unusual pinyon cultivated at the Royal Botanic Gardens, Kew; it was found to match wild specimens from the Pico de Orizaba. At first it was described as a subspecies of Mexican Pinyon, but further research by Bailey & Hawksworth and others has shown that it is better treated as a distinct species. Some botanists still include it in Mexican Pinyon though, despite their occurring together in some sites without evidence of hybridisation. Orizaba Pinyion shows better adaptacion to rainy temperate climate like England than Pinus cembroides which grows in dryer habitats.
Orizaba Pinyon is most closely allied to Johann's Pinyon and Potosi Pinyon, with which it shares the leaf structure with the stomata confined to the inner faces; it differs from these in the larger cones and seeds, and from the latter in fewer needles per fascicle (3-4 vs 5). Like these two, the white-glaucous inner surfaces of the needles make it a very attractive small tree, suitable for parks and large gardens.
The edible (pine nut) seeds are collected in Mexico to a small extent.
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