06 October 1993.
Guanajuato, Mexico
Locality: Road from San Miguel de Allende to Celaya. 5.8 km NE Presa Allende.
Coordinates: 20.8500, -100.7833
(Map it)
Elevation: 1900m.
Environment description: Grassy roadside area, rocky, silty, clay loam. Assoc. sp. Tithonia, Tagetes, Mimosa, Numerous grasses.
Comment: Population large, sample moderate.
Collector(s): - Campos, Alvaro, Universidad National Autonoma de Mexico
- Fuentes-Granados, Roger, Iowa State University
- Roath, William W., USDA, ARS
- Widrlechner, Mark P., USDA, ARS