Echinocereus engelmannii subsp. magnursensis Berresf. & M.Terry in Echinocereenfreund 32(4). 2019 sec. Berresford & Terry 2019
- Holotype: United States of America, California: San Bernardino County, northeast of Big Bear City, alt. 2059 m, 19 Jul 2017, P. Berresford & M. Terry PB7479 (SRSC: 10092)