| Locality: | United States. Kentucky. Garrard: Camp Nelson Quarry, an Ordovician limestone quarry, abandoned in 1991, 1. 7 mi of KY 1845 from junction of US 27 and 1.0 mi WNW of Lambert Methodist Church, 12. 2 mi N of Lancaster. |
| Habitat: | An Ordovician limestone quarry, abandoned in 1991. Wet gravel floor. Native annual, frequent. Associates: Cyperus flavescens, Cyperus strigosus. |
| Collector: | Ralph L. Thompson, Stephanie R. Green 00-538 |