Thismia americana, known as thismia or banded Trinity, was a species of flowering plant that was first discovered in 1912 by Norma Etta Pfeiffer in the wetlands surrounding Chicago's Lake Calumet, and described by her in 1914. The type specimen was found in what was then a wet-mesic sand prairie at 119th Street and Torrence Avenue in what would become the industrial neighborhood of South Deering. The plant has not been seen since 1916, and the ground where it was observed has since been extensively altered by industrial development. The species is believed to be extinct. Several extensive searches have not uncovered any living specimens of the vanished species.