Missouri evening primrose

Oenothera macrocarpa

Formerly Oenothera missouriensis. Drought tolerant, trailing native perennial with large fragrant canary yellow flowers, blooming nocturnally April to July. Common on dry open prairies, rocky hillsides, roadsides and disturbed areas; below 6,000 ft. elevation. Useful for erosion control or beautification. Attracts night pollinators such as hawkmoths.