Pinus nelsonii, Nelson's pinyon, is a species of pine native to the mountains of northeastern Mexico, in Nuevo León, San Luis Potosí and Tamaulipas at 1,800–3,200 m altitude. It has very singular characteristics and is not closely related to any other pines in either morphology or genetics. It is placed in subgenus Strobus either in its own section Nelsonia or subsection Nelsoniae.
'Pinus nelsonii is exceptional. Evidence from three nuclear genes (Syring et al., 2005) and cpDNA (Gernandt et al., ...
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* Al information er baseret på offentliggjort videnskabelig forskning