Evening primrose

Evening primrose, any of various wildflowers of family Onagraceae, native to North America. These annual, biennial, or perennial plants are 1–6 ft (30–180 cm) high, with hairy leaves and saucer-shaped white, yellow, or pink flowers. The name refers especially to Oenothera biennis, a biennial 3–5 ft (90–150 cm) tall, with yellow flowers 1–2 in. (3–5 cm) in diameter that open in the evening.