| Locality: | United States. Kentucky. Madison: Cowbell Reservoir, 16.8 surface acres, created in 1954, elevation 988 feet. 1.0 mi W of US 421-25 and Ky 21 at Bighill. 1.7 mi S on maintenance road, Berea College Forest, Knobs Section. |
| Habitat: | Western Mesophytic Forest. Seasonally Dewatered Flats [Polygonum-Leersia-Scirpus]; occasional. Associates: Bidens ssp., Microstegium vimineum, Rotala ramosior, Impatiens capensis, Carex frankii, C. lurida. |
| Collector: | Ralph L. Thompson, Rudy A. Gelis R-371 |