Camissonia, sometimes commonly known as sun cup or sundrop, is a genus of annual and perennial plants in the evening primrose family Onagraceae.

Previous circumscriptions of the genus had recognized up to 62 species before it was split among other closely related genera.

Camissonia species are used as food plants by the larvae of some Lepidoptera species including Schinia cupes and Schinia deserticola, both of which feed on C. claviformis, the latter exclusively.

The genus is named after the botanist Adelbert von Chamisso.

According to The Plant List, the genus includes the following accepted species:[2]