old-woman cactus References old-woman cactus plant Ask Anything Homework Help Also known as: Mammillaria hahniana Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: old man cactus…golden old man (Pilosocereus chrysacanthus); old woman (Mammillaria hahniana); Chilean old lady (Eriosyce senilis); and old man of the mountain (Cleistocactus trollii). Read More…golden old man (Pilosocereus chrysacanthus); old woman (Mammillaria hahniana); Chilean old lady (Eriosyce senilis); and old man of the mountain (Cleistocactus trollii). Read More