24 September 2007.
Texas, United States
Locality: North side of Highway 20, ~3 miles southeast of Tornillo.
Coordinates: 31.4167, -106.0467
(Map it)
Elevation: 1089m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Along irrigation ditch. Sandy loam soil.
Number of plants sampled: 200
Comment: Population size >1000.
Collector(s):