Common Names: Common evening-primrose, evening star, sun drop, weedy evening primrose, German rampion, hog weed, King's cure-all, fever-plant
Sub-category: Evening primrose family
Grows to 30 to 150 cm tall. The leaves are lanceolate, 5 to 20 cm long and 1 to 2.5 cm broad, produced in a tight rosette the first year, and spirally on a stem the second year. The flowers are produced on a tall spike and only last until the following noon. They open visibly fast every evening producing an interesting spectacle, hence the name 'evening primrose.' The blooms are pale yellow, 2.5 to 5 cm diameter, with four petals and hermaphrodite. The flower structure has an invisible to the naked eye bright nectar guide pattern. This pattern is apparent under ultraviolet light and visible to its pollinators, moths, butterflies and bees. The fruit is a capsule 2 to 4 cm long and 4 to 6 mm broad, containing numerous 1 to 2 mm long seeds, released when the capsule splits into four sections at maturity.
Blooming lasts from late spring to late summer.
Primary Flower Color: Yellow
Secondary Flower Color: Yellow