15 September 1983.
Querétaro, Mexico
Locality: Hwy 120, Jalpan to San Juan del Rio, just beyond Madrono, about 4 km NW along the track to the microwave tower.
Coordinates: 21.1000, -99.7000
(Map it)
Elevation: 2850m.
Environment description: 45 degree S-facing slope in mountainous oak forest; protected by rocks and shrubs; soil red, with leaf litter.