United States, Missouri, Saint Louis Co., West Tyson County Park, Manchester; 7.5 min topo quadrangle, along Meramac River. T44N, R4E, SW ¼; SW ¼, Section 28.
38.597 -90.5093
Sandy-loam riverbanks, S side of slough; in partial shade; with silver maple.
{"habit":"Flowers pale cream-green; locally common, clonal herb 1 m tall."}