Rudbeckia triloba (browneyed susan, brown-eyed susan, thin-leaved coneflower, three-leaved coneflower) is a plant native to the United States. It is sometimes grown in gardens, but it is usually seen in old fields or along roadsides.
It is a herbaceous biennial to weak perennial native to Central and Eastern United States. Height is 2–3 ft with a spread of 1.0 to 1.5 ft. The species needs full sun and medium water. It is easy to grow. Spent flowers should be removed to encourage additional bloom and/or to prevent any unwanted self-seeding. This plant is in part distinguished from black-eyed susan by having a more profuse bloom of smaller flowers that usually have fewer rays per flowerhead. The basal leaves are often trifoliate (three leaflets, sometimes each of the three also divided.)