Echinocactus longihamatus var. gracilispinus Engelm. in Proc. Amer. Acad. Arts 3: 273. 1856 Echinocactus longihamatus var. gracilispinus Engelm. in Proc. Amer. Acad. Arts 3: 273. 1856Taxon for this nameEchinocactus longihamatus var. gracilispinus Engelm.
