2. Thismia americana Pfeiffer (1914: 123)

Homotypic synonym: — Sarcosiphon americanus (N.Pfeiff.) Schlechter (1921: 39) .

Type: — USA. Illinois State: Cook County, Chicago, in open prairie, 1912–1913, N.E. Pfeiffer s.n. (holotype F: F0360794F!; possible isotypes ILL: ILL00009940!, K, L, MO: MO-202885!, NY) .

Distribution: — USA (Illinois: Jonker 1938, Lewis 2003); extinct (Merckx & Smets 2014).