02 October 2006.
Iowa, United States
Locality: Near the east end of Reindeer Ridge, Ledges State Park, NE 1/4 of NE 1/4 of NW 1/4 of Section 21, T83N, R26W, Worth Township, Boone County.
Coordinates: 41.9939, -93.8844
(Map it)
Elevation: 329m.
Environment description: Large slump below sandstone cliff outcrop. Few feet up from Pea's creek floodplain. Partial sun. Northwest facing. Moist-wet clay soil.
Associated species: Agalinis tenuifolia, Dalea candida, D. purpurea, Gentiana alba, Lobelia siphilitica, Pedicularis canadensis, Polygala senega, and Zizia aurea.
Comment: Population of 30-40 plants.
Collector(s):