- A taxonomic genus within the family Onagraceae — 7-10 species of flowering plants, most commonly known as enchanter's nightshades.
Hyponyms Circaea canadensis (syn. Circaea lutetiana subsp. canadensis)Circaea cordataCircaea erubescensCircaea glabrescensCircaea lutetiana (enchanter's-nightshade)Circaea mollisCircaea quadrisulcata (syn. Circaea canadensis subsp. quadrisulcata)Circaea repens
From Ancient Greek Κίρκη (Kirke, “Circe”), the mythical enchantress who used the plant in her magic.