13 October 2008.
Pennsylvania, United States
Locality: Along west shore of Allegheny River, just south of Dennison Run, Venango County.
Coordinates: 41.2731, -79.8469
(Map it)
Environment description: Gravel/cobble margin of the large river. Primarily dominated by dense Spartica pectinata with some other herbs scattered about, such as Hypericum ascyon, Vernonia gigantea, Eutrochium maculatum, Salix interior, Phalaris arundinace.
Number of plants sampled: 50
Comment: Panicum virgatum is definitely native.
Collector(s):