Title: Biblio RTF Export
Author: Biblio 7.x

N. Lord Britton and Brown, A., An Illustrated Flora of the Northern United States, Canada And The British Possessions, 2nd ed., vol. 3. Charles Scribner?s Sons, 1913.

P.  Hoffmann, ?Compositae?, in Die Natürlichen Pflanzenfamilien, vol. 4(5), A.  Engler and Prantl, K., Eds. Leipzig: Engelmann, 1894, pp. 87-387.

A.  Gray, Synoptical Flora of North America, vol. 2, Part 1. New York, NY: American Book Company, 1884.

S. B.  Jones, Jr., ?Chromosome Numbers in Compositae?, Bulletin of the Torrey Botanical Club, vol. 97, pp. 168-171, 1970.

M. Frotscher Koch, ?Studies in the Anatomy and Morphology of the Composite Flower II. The Corollas of the Heliantheae and Mutisieae?, American Journal of Botany, vol. 17, pp. 995-1010, 1930.

A. B.  Gutierrez and Herz, W., ?Ambrosanolides and other constituents of two rudbeckia species.?, Planta Med., vol. 56, pp. 295-297, 1990.

D. E.  Moerman, Native American Ethnobotany. Portland, OR: Timber Press, Inc., 1998.

J. L.  Strother, Flora of North America, vol. 19. New York: Oxford University Press, Inc., 2006, pp. 202-203.

L. E.  Urbatsch and Cox, P. B., ?Rudbeckia?, in Flora of North America, vol. 21, , Ed. 2006.

N. R. C. S.  USDA, ?The PLANTS Database?. 2010.