Acanthocalycium rhodotrichum Lectotype: Paraguay, near the Arroyo La Cruz, 6 km from the now deserted S. Salvador, at the Río Tagatiya-mi”, 25 Jan 1898, Anisits Cact. 25 (B, in spirit: B810006945)) Isolectotype: Paraguay, near the Arroyo La Cruz, 6 km from the now deserted S. Salvador, at the Río Tagatiya-mi”, 25 Jan 1898, Anisits Cact. 25 (B, in spirit: B810006946) Syntype: Paraguay, near the Arroyo La Cruz, 6 km from the now deserted S. Salvador, at the Río Tagatiya-mi, Anisits Cact. 20 (B, in spirit)