Melocactus curvispinus Lectotype: Cuba, [Sancti Spíritus Province], Boca Chica, Sierra de Jatibonico del Sur, Apr 1934, Guitart 16106 (HAC) Neotype: Mexico, Veracruz, cerca de Laguna Verde, selva baja saxicola, 28 Jul 1986, Taylor & Guzmán 365 (MEXU: MEXU 00474886)