I’m not sure my grandmother ever wore a nightcap quite like this but Grandmother’s nightcap is just one of the vernacular names for the luminous Wood anemone (Anemone nemorosa). Others include Windflower, and, in parts of Deryshire, where a moggie is a mouse not a cat, Moggie nightgown, as well as Smell foxes, due to the musky smell a large colony of Wood anemones will sometimes emit.