 The subspecies epithet "kimnachii" honours Myron Kimnach (1922-2018), a botanist mainly working with epiphytic cacti and Crassulaceae, and for many years working at the University of California, Berkeley and Huntington Gardens.Kimnach was director of the Huntington Botanical Gardens for 25 years and editor of the Cactus and Succulent Society of America's Journal, and Managing Editor of its peer-reviewed, technical yearbook, "Haseltonia" for ten years.This species is very distinct.