Here is a more typical example of enchanter's nightshade, with green sepals. The red variety is not common. I've never seen it described in any of the technical material. If you Google it, there are a few images of red scattered among the typical whites. One would expect a plant named for Circe would have an extensive history of witchcraft and herbal medicine, but references are relatively sparse. The Iroquois used it to make their 'little water medicine', which they used to wash wounds. The history of the technical name is a little complicated, involving at least three species names; C. canadensis, C. lutetiana, and C. quadrisulcata. Don't know why the North American version now takes precedence.