This biennial usually has a central light green or red stem with alternate leaves. A panicle of pale yellow flowers, with four petals and prominent stamens, sits atop each major stem. The flowers have a mild lemony scent and remain open from evening to early morning--even longer on cloudy days.
Oenothera biennis, Evening Primrose
Height: 3-5'. Yellow blooms appear in late spring. Prefers sun with some afternoon shade. Native. Attracts pollinators.