Pinus arizonica var. stormiae
Syn: Pinus ponderosa D. Douglas ex P. Lawson var. stormiae (Martínez) Silba 1990 (Farjon and Styles 1997).
This species is one of many principal hosts for the dwarf mistletoe Arceuthobium vaginatum subsp. vaginatum, and is also a principal host for A. vaginatum subsp. cryptopodum (Hawksworth and Wiens 1996).