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.[1] [2]
It is native to the southwestern United States and northern Mexico.[2] [3]
It grows below 4500feet in many types of flat desert habitats, including Creosote bush scrub, Joshua tree woodland, and Pinyon-juniper woodland.[1] It is found in the Mojave Desert.[1] [2]
Oenothera primiveris is a hairy annual herb producing a dense rosette of leaves in which the inflorescence occurs. There is generally no true stem.[4]
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.[4]
Flowers arise from the axils of the leaves. Each flower has yellow petals up to 4cm (02inches) in length which fade orange or red with age.[4] Its bloom period is February through May.[1] [2]
The fruit is a straight or curving capsule up to 6cm (02inches) in length.[4]