26 September 1983.
Durango, Mexico
Locality: Just before km 103 on Hwy 39 between Santa Teresa and Santigo Papasquiaro.
Coordinates: 24.8000, -105.1333
(Map it)
Elevation: 2150m.
Environment description: S-facing slope in a hilly area; under Opuntia and Acacia, in black soil.