Oenothera pallida

Oenothera pallida, the pale evening-primrose, is a species of flowering plant in the family Onagraceae. It is native to British Columbia, the western United States, and northern Mexico. Flowers start out white and fade to pink.

Subtaxa
The following subspecies are accepted:
 * Oenothera pallida subsp. latifolia (Rydb.) Munz – Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Utah, Wyoming
 * Oenothera pallida subsp. pallida – British Columbia, Arizona, Colorado, Idaho, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming, northern Mexico
 * Oenothera pallida subsp. runcinata (Engelm.) Munz & W.E.Klein – Arizona, Colorado, New Mexico, Texas, Utah, northeastern Mexico
 * Oenothera pallida subsp. trichocalyx (Nutt.) Munz & W.E.Klein – Arizona, Colorado, New Mexico, Utah, Wyoming