20 September 2010.
Arizona, United States
Locality: Northwest side of FR 486 (Helvetia Road), north of FR 410, Santa Rita Experimental Range of the University of Arizona, Pima County.
Coordinates: 31.8249, -110.8604
(Map it)
Elevation: 1127m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Wash valley, but above the level of recent floods. Full sunlight. Level ground. Near grasses, Opuntia, and Prosopis.
Number of plants sampled: 100
Comment: Plants were flowering and have mature seeds. Plants pull up easily since the root system is minimal.
Collector(s):