Collected
09 June 1992.
Arizona, United States
Locality: Santa Cruz Co., ca. 100 m from end of pavement, E of I-19 exit S of Tumacacori, on road to Rock Corral Canyon. 31 33'30"N, 111 03'12"W. 803 m elevation.
Environment description: Dense population along gravel shoulders of road.
Number of plants sampled: 50