Hamatocactus Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 104, 1922

Hamatocactus bicolor (Teran & Berland.) I.M. Johnston, Contributions from the Gray Herbarium of Harvard University 70: 87, 1924

Hamatocactus crassihamatus (A. Weber) F. Buxbaum, Osterr. Bot. Zeitschr. 98. 60, 1951

Hamatocactus hamatacanthus (Muehlenpf.) F. M. Knuth in Backeberg & F. M. Knuth, Kaktus-ABC 353., 1935

Hamatocactus hamatacanthus v. davisii (Houghton) Marshall in Marshall & T. M. Bock, Cactaceae (Berlin) 145, 1941

Hamatocactus hamatacanthus v. papyracanthus

Hamatocactus hamatocanthus (Houghton) W.T. Marshall 

Hamatocactus hamatocanthus v. davisii (Houghton) Marshall in Marshall & T. M. Bock, Cactaceae (Berlin) 145. as hamatacanthus, 1941

Hamatocactus longihamatus

Hamatocactus longihamatus v. crassispinus Engelmann 

Hamatocactus mathssonii

Hamatocactus setispinus (Engelmann) Britton & Rose, The Cactaceae; descriptions and illustrations of plants of the cactus family 3: 104-106, f. 110, 111, 112, 113, 114, 1922

Hamatocactus setispinus f. cachetianus (Monv) Backeberg et Knuth, Kakteen (H. Krainz) Lief. 31-32: C VIIIb., 1965

Hamatocactus setispinus f. flavibaccatus G. Unger, Kakteen und Andere Sukkulenten 32: 290-291, 1981

Hamatocactus setispinus f. orcuttii (K. Schumann) Krainz, Kakteen (H. Krainz) Lief. 31-32: C VIIIb., 1965

Hamatocactus setispinus v. hamatus  

Hamatocactus setispinus v. longispinus Miller 

Hamatocactus setispinus v. marisianus Gelotti 

Hamatocactus setispinus v. mertellii Gerde Frer 

Hamatocactus setispinus v. setaceus

Hamatocactus sinuatus (A. Dietrich) Orcutt, Cactography, 6., 1926

Hamatocactus sinuatus v. papyracanthus

Hamatocactus uncinatus (Gal) F. Buxbaum, Cactography, 6, 1926

Hamatocactus uncinatus ssp. crassihamatus (F.A.C. Weber) C.E. Glass, Guía Identific. Cact. Amenazadas México, 1: (1998 publ.): 1997

Hamatocactus uncinatus v. wrightii (Engelmann) F. Buxbaum, Cact. Suc. Mex., 25 (3): 65: 1980

Hamatocactus wrightii Orcutt, Cactography, 6, 1926