Pinus arizonica var. cooperi
Pino de Cooper [Spanish], Cooper's pine.
Syn: Pinus cooperi C.E. Blanco 1950; P. lutea Blanco ex Martínez 1945 non Walter 1788, nec Gordon & Glendinning 1858; P. lutea var. ornelasi Martínez 1945; Pinus cooperi var. ornelasii (Martínez) C.E. Blanco 1950 (Farjon and Styles 1997). As with the other varieties of P. arizonica, characters distinguishing the varieties vary continuously, thus treatment at the species rank is inappropriate (Farjon and Styles 1997), though. The name "var. ornelasii" was attributed by Martínez to a 5-leaved form with dark green, longer needles and larger cones, but Farjon and Styles (1997) found these differences to be inconsistent (sometimes larger cones and normal needles, or longer needles and unusually small cones) and reduced the variety to synonymy.
Until I get a proper description posted here, these are my field notes from the mountains of Durango: "I saw P. arizonica var. cooperi earlier. I looked quite a bit and only found one tree. The needles are about the same length as on P. durangensis and the cones are about the same size as on P. durangensis but they are attached to the branch like on P. pseudostrobus and the bark resembles P. ponderosa, though not so pretty. Anyway you look for those things as you're flying down the road trying to pick it out from all the P. durangensis which otherwise resembles it closely."
Mexico: Chihuahua and Durango. Locally found with var. arizonica. See Pinus arizonica for an interactive distribution map. Commonly found with P. durangensis, P. leiophylla, P. strobiformis and P. teocote (Farjon and Styles 1997). Also see Thompson et al. (1999). Hardy to Zone 7 (cold hardiness limit between -17.7°C and -12.2°C) (Bannister and Neuner 2001).
The only place I have seen it is at the location shown at left, northeast of El Salto, Durango, at 23.855193°N, 105.309440°W.
This variety is a principal host for the dwarf mistletoes Arceuthobium globosum subsp. globosum, Arceuthobium rubrum, A. vaginatum subsp. vaginatum, and A. verticilliflorum (Hawksworth and Wiens 1996).
Last Modified 2014-10-16