01 October 1993.
Tamaulipas, Mexico
Locality: Roadside area. N side of road 200 m SW bridge across Rio Chihue, Hwy 101, 45.9 km SW Ciudad Victoria near Ejido San Antonio.
Coordinates: 23.5833, -99.3333
(Map it)
Elevation: 650m.
Environment description: Soil clay. Assoc. sp. Acacia, Lippia, Ambrosia.
Number of plants sampled: 20
Comment: Population very large, extends along roadside ca. 100 m.
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