Oenothera rhombipetala, the four-point evening-primrose, greater four-point evening-primrose, or diamond petal primrose, is a species of flowering plant in the family Onagraceae.

[2] It is native to the central United States.

[1] A biennial, it is often found alongside roads.

[2] It can grow up to 5 feet (1.5 metres) tall.

[2] The dusk and night flying bee Lasioglossum texanum only collects pollen from the four-point evening-primrose.