Hooker evening primrose

Oenothera elata

Formerly Oenothera hookeri. Tall native biennial or short-lived perennial with fragrant yellow flowers, blooming nocturnally April to November. One of the largest and showiest of the evening primroses. Occurs on open slopes, roadsides, moist lowlands and streams; up to 10,000 ft. elevation. Attracts night pollinators, including hawkmoths.