|Other names:||common evening primrose, hoary eveningprimrose, common eveningprimrose, king's-cureall, common evening-primrose, field primrose, coffee plant, fever plant, cureall|
Leaves are long and narrow, resembling willow leaves. Upright habit with one or several dominant stems and a fleshy taproot. Height can reach 6 ft. or more. Flowers are 1 inch across with 4 petals. Seeds can be viable in the soil for 70 years.