Named for Scottish-born American botanist and explorer in Southern Mexico Thomas Baillie MacDougall (1895–1973). Cutak: “It is my pleasure to name it Peniocereus Macdougallii, dedicating it to Thomas MacDougall, who for many years has been an enthusiastic student and collector of plants in the Isthmian region of Mexico.”
Maarten H.J. van der Meer (2022 Feb 27). Acanthocereus macdougallii. Dictionary of Cactus Names. Retrieved from https://www.cactusnames.org/acanthocereus-macdougallii