Rudbeckia triloba L.
* Species Plantarum 2:907. 1753
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.
* Rudbeckia hirta - Herbaceous perennial. Native to central-eastern United States. Height is 2–3 feet with a spread of 1 to 1.5 feet. Needs full sun and medium water. Easy to grow. Deadhead spent flowers to encourage additional bloom ad/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.
Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License