| Locality: | United States. Kentucky. Madison: Lower Silver Creek Reservoir (B Lake), 19.3 surface acres, created in 1939, elevation 980 feet, 1.9 mi W of US 421-25 and Ky 21 at Bighill, and 0.7-1.1 mi S of Ky 21 on maintenance road, Berea College Forest, Knobs Section, Western Mesophytic Forest. |
| Habitat: | Western Mesophytic Forest. Emergent Marsh [Typha-Carex-Eleocharis]; infrequent. Associates: Acorus calamus, Scirpus cyperinus, Sagittaria australis, Polygonum amphibium, Ludwigia alternifolia, Leersia oryzoides. |
| Collector: | Ralph L. Thompson, Rudy A. Gelis R-272 |