28 August 2007.
Iowa, United States
Locality: Roosevelt Elementary School, 921 9th Street, Ames.
Coordinates: 42.0311, -93.6231
(Map it)
Elevation: 285m.
Environment description: Pavement crack between an east facing brick wall and cement pavement.
Number of plants sampled: 80
Comment: Stand mixed with Setaria italica subsp. viridis.
Collector(s):