Echinocereus ×roetteri var. lloydii Echinocereus ×roetteri var. lloydii (Britton & Rose) Backeb., Cactaceae 4: 2027. 1960 sec. ???≡Echinocereus lloydii Britton & Rose, Cactaceae 3: 37–38. 1922 syn. sec. IPNI 2000+11. IPNI 2000+: International Plant Names Index. – The Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries and Australian National Botanic Gardens – http://www.ipni.orgContent
