Narrowleaf Evening Primrose (Oenothera fruticosa)

Also known as Sundrops, the native Narrowleaf Evening Primrose brings a bright yellow pop to meadows and native plant gardens. They enjoy lots of sun and wet but well draining soil. 
Although evening is in their name, they bloom in the morning - blooms lasting a few days. 
Native Americans once used this plant for a variety of ailments - weight loss, upset stomach, hemorrhoids, and to treat bruises. A compound found in the seeds is showing promise in treating breast cancer.