As classified in WFO snapshot
December 2023
Warning: older classification
variety
Echinocactus sessiliflorus var. tetracanthus
(Lem.) Monv. ex Lem.
This variety name was first published in Cact. Gen. Sp. Nov.: 88. 1839.
This variety name has been reclassified since this snapshot. Its current preferred usage is a synonym .