The Circaea, or enchanter's nightshades, are a genus of flowering plants in the evening primrose family Onagraceae.

The generic name Circaea refers to the enchantress Circe from Greek mythology who is said to have used the herb as a charm.

Molecular evidence indicates the closest relative to Circaea is the lineage that gave rise to the genus Fuchsia, which diverged from it around 41 million years ago.

[8] Members of genus Circaea occur throughout the temperate and boreal forests of the Northern Hemisphere, from near sea level to 5,000 meters (16,000 ft) altitude, and from 10°–70° N latitude.

[7] Likewise Circaea canadensis ranges across continents, in North America, European Russia, and Asia.