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. It is native to the central United States. A biennial, it is often found alongside roads. It can grow up to tall.
Oenothera rhombipetala was scientifically described and named by botanist Thomas Nuttall in 1840. It is classified in the genus Oenothera within the Onagraceae family. It has no varieties, but was described as a variety of Oenothera heterophylla in 1942. It has two heterotypic synonyms.
The dusk and night flying bee Lasioglossum texanum only collects pollen from the four-point evening-primrose.