19 October 1983.
México, Mexico
Locality: Road between Santa Marta and Huitzilac, near Lagunas de Zempoala, approximately 13 km from Tres Marias.
Coordinates: 19.0333, -99.3333
(Map it)
Elevation: 2900m.
Environment description: On a slope below the road, under Pinus and Dahlia.