01 October 1993.
Tamaulipas, Mexico
Locality: 18.8 km SW Tula on Hwy 101 toward San Luis Potosi. Both sides of hwy extending several m up hillside.
Coordinates: 23.8333, -99.8833
(Map it)
Elevation: 1100m.
Environment description: Soil gravelly clay. Assoc. sp. Opuntia, Larrea, Acacia, Yucca.
Number of plants sampled: 10
Comment: Population small. Plants mixed with those with dull yellow flowers.
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