Oenothera triloba, with common names stemless evening primrose and sessile evening primrose is a flowering plant in the primrose family. It is native to North America, where it is primarily found in northern Mexico and in the south-central United States. It is found in dry, open areas such as glades, prairies, and sometimes even lawns. It appears to respond positively to soil disturbance.
It is a winter annual that produces large yellow flowers in the spring. The flowers open near sunset.
Oenothera triloba was scientifically described and named by Thomas Nuttall in 1821. It is classified in the genus Oenothera as part of the family Onagraceae. According to Plants of the World Online it has no accepted varieties, but it has synonyms including five species and three varieties.
Among the Zuni people, the plant is used as an ingredient of "schumaakwe cakes" and used externally for rheumatism and swelling. They also grind the roots and use them as food.