Massimo Afferni, Il “cuscino della suocera” a quale genere di Cactaceae appartiene? – Piante Grasse 42:1 (2022)

Echinocactus grusonii has a quite complicated taxonomic history, since there have been several attempts to move it to different genera during the last few years. The author summarizes the main results of the phylogenetic studies which have been published so far and outlines the future prospects of the research on this species.