Taxonomic status: Unresolved

homotypic synonyms:
Echinomastus unguispinus (Engelm.) Britton & Rose; Neolloydia unguispina (Engelm.) L.D. Benson; Pediocactus unguispinus (Engelm.) Halda; Sclerocactus unguispinus (Engelm.) N.P. Taylor; Thelocactus unguispinus (Engelm.) G.D. Rowley;

protologue: Mem. Tour N. Mexico : 111 (1848)
URL protologue: https://archive.org/stream/mobot31753000562196#page/111/mode/2up

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