United States, Missouri, Stoddard, Mingo National Wildlife Refuge, just NW of Puxico on W side of State Highway 51; Sassafras Ridge (Cow Knoll Ridge), on W side of Red Mill Drive, N of Pool 6 and S of juncytion with seasonal E-W road, E portion of property open upland unit with corn planting surrounded by open grassy area having small depressions; locally common in depressionswith Carex, Eryngium, Juncus, Eleocharis