| Locality: | United States. Kentucky. Garrard: Camp Nelson Quarry, an Ordovician limestone quarry, abandoned in 1991, 1.7 mi off KY 1845 from junction of US 27 and 1.0 WNW of Lambert Methodist Church, 12.2 mi. N of Lancaster. |
| Habitat: | An Ordovician limestone quarry, abandoned in 1991. Wet gravel floor. Native annual, abundant. Associates: Cyperus squarrosus, Cyperus strigosus. |
| Collector: | Ralph L. Thompson, Stephanie R. Green 00-516 |