Spelling variant (perhaps intended as a correction) of Torreycactus.
Maarten H.J. van der Meer (2022 Feb 05). Torreyocactus. Dictionary of Cactus Names. Retrieved from https://www.cactusnames.org/torreyocactus
David Hunt (2006): The New Cactus Lexicon
Maarten H.J. van der Meer (2022 Feb 05). Torreyocactus. Dictionary of Cactus Names. Retrieved from https://www.cactusnames.org/torreyocactus