Oenothera primiveris is a species of flowering plant in the evening primrose family known by the common names yellow desert evening primrose, bottle evening-primrose, and desert evening-primrose. Calflora Database: Oenothera primiveris Lady Bird Johnson Wildflower Center-NPIN: Oenothera primiveris
Habitat It is native to the southwestern United States and northern Mexico.USDA: Oenothera primiveris
It grows below in many types of flat desert habitats, including Creosote bush scrub, Joshua tree woodland, and Pinyon-juniper woodland. It is found in the Mojave Desert.
Description Oenothera primiveris is a hairy annual herb producing a dense rosette of leaves in which the inflorescence occurs. There is generally no true stem.Jepson eFlora: Oenothera primiveris
The green or grayish leaves are up to 28 centimeters long and have wavy or crinkled edges, or are cut into deep lobes or teeth.
Flowers arise from the axils of the leaves. Each flower has yellow petals up to in length which fade orange or red with age. Its bloom period is February through May.
The fruit is a straight or curving capsule up to in length.
Subspecies Oenothera primiveris subsp. bufonis — Large yellow desert primrose, endemic to the Mojave Desert in California & Nevada.Calflora Database: Oenothera primiveris ssp. bufonis Oenothera primiveris subsp. primiveris Calflora Database: Oenothera primiveris ssp. primiveris
References
External links Calflora Database: Oenothera primiveris (Yellow desert evening primrose) Jepson Manual eFlora (TJM2) treatment of Oenothera primiveris UC CalPhotos gallery of Oenothera primiveris images