It's housed in the biology institute - a couple of pictures of the interconnected buildings are below. Note the succulent garden in the first picture, and the large cycads in the second picture.
The label tells us a lot of information: it was collected in the Hildalgo region in 1970 by Francisco Gonzalez-Medrano and it was the 2969th collection he made. The name has been in flux as you can see by the addition of the labels.
David tells me that there are 49 pine species in Mexico. It's a biodiversity hotspot for these and many other groups of plants.