10 September 2006.
Iowa, United States
Locality: Near center of NW 1/4 of Section 21, T69N, R9W, Keosauqua, Van Buren County.
Coordinates: 40.7658, -91.9039
(Map it)
Elevation: 175m.
Georeference protocol: Lat/Lon determined via Map location
Environment description: Muddy, rocky bed of Rock Creek. Partial shade; nearly flat slope, open to the south. Alluvium soil mixed with rocks; very stony with good drainage. Rare population abundance. Floodplain forest.
Number of plants sampled: 1
Associated species: Populus deltoides, Acer negundo, Morus alba. Closely associated with Lobelia siphilitica, Bidens (rayless), Pilea pumila, and Phalaris arundinacea.
Collector(s):