Distribution

Endemic to northeast Mexico: Coahuila, Nuevo Leon, and San Luis Potosi. The extent of occurrence (EOO) estimated on the basis of recorded herbarium specimens is 37,912 km². The area of occupancy is estimated to be 320 km². There are four locations and the subpopulations are severely fragmented.

The size of subpopulations of this variety is generally smaller than of the southern variety australis with the majority covering less than 1,000 ha.

Habitat and Ecology

This northern variety is mainly found on alkaline soils (pH 7-8) derived from limestone. It is most commonly found scattered in mixed pine-oak forest.

Conservation Status

Global Status

Near Threatened

Global Rationale

Unlike the southern variety, this northern variety occurs in areas which are less intensively affected by land clearance for agriculture. Some decline may occur, but it is possibly balanced by regeneration elsewhere as this pine also establishes in secondary forest. Its area of occupancy (AOO) is very likely within the threshold for an Endangered listing, and the population is certainly fragmented, but it does not meet the continuing decline criterion under B which is needed to be listed as threatened. It is therefore listed as Near Threatened.

Conservation Actions

No collections were recorded from protected areas. These should be established to include this taxon.