Evening primrose is a flowering plant native to North America, known for its bright yellow blooms that open in the evening. Its scientific name is Oenothera biennis, and it typically grows in fields and along roadsides. The plant can reach heights of up to 1.2 meters (4 feet) and has slender, lance-shaped leaves. The seeds of evening primrose are rich in oil, which is often extracted for use in dietary supplements. This oil contains gamma-linolenic acid (GLA), an omega-6 fatty acid believed to have various health benefits, including support for skin health and hormonal balance.