Oenothera nuttallii

Oenothera nuttallii, the white-stemmed evening-primrose, is a species of flowering plant in the family Onagraceae. It is native to western Canada (except British Columbia), and the north-central United States, and it has been introduced to Illinois. A perennial reaching 60 cm, it is found in grasslands, sagebrush steppes, and plains, usually in sandy soils.