Tephrocactus recurvatus Holotype: Argentina, San JUan, Ullum, 10 km N of San Juan, nr RN 40, Sierra Villicum, Márquez s.n. (SI: 28459) Isotype: Argentina, San JUan, Ullum, 10 km N of San Juan, nr RN 40, Sierra Villicum, Márquez s.n. (ZSS)