Thelocactus tulensis subsp. buekii Thelocactus tulensis subsp. matudae Thelocactus matudae Thelocactus nidulans subsp. matudae Thelocactus tulensis var. buekii Thelocactus tulensis var. matudae Echinocactus buekii Thelocactus buekii subsp. matudae
Taxonomic data from World Flora Online, accessed June 20, 2024