Collected
21 August 2008.
Arizona, United States
Locality: Willow Springs Road, N of Willow Springs Ranch along large arroya draining to east N 32 44.03' x W 110 53.74'
Elevation: 3850m.
Environment description: Arroyo banks and sandbars in channel. Xeroriparian woodland in semidesert grassland
Number of plants sampled: 40