Literature

Authors	Year	Title
Linnaeus	1753	Species Plantarum
W. Aiton	1789	Hortus Kewensis, or, A catalogue of the plants cultivated in the Royal Botanic Garden at Kew.
A. Gray	1884	Synoptical Flora of North America
P. Hoffmann	1894	Compositae
O. A. Farwell	1904	Contributions to the Botany of Michigan, No. 8
N. Lord Britton, Brown A.	1913	An Illustrated Flora of the Northern United States, Canada And The British Possessions
M. Frotscher Koch	1930	Studies in the Anatomy and Morphology of the Composite Flower II. The Corollas of the Heliantheae and Mutisieae
A. Cronquist	1945	Notes on the Compositae of the Northeastern United States. II. Heliantheae and Heliniae.
Cronquist, Hitchcock, C. L., al, et	1955	Vascular Plants of the Pacific Northwest
R. E. Perdue, Jr.	1957	Synopsis of Rudbeckia Subgenus Rudbeckia
R. E. Perdue, Jr.	1962	Two New Varieties and a New Combination in Rudbeckia
S. B. Jones, Jr.	1970	Chromosome Numbers in Compositae
P. Service	1984	Genotypic Interactions in an aphid-host plant relationship: Uroleucon rudbeckiae and Rudbeckia laciniata
M. Cunningham, Parr P. D.	1990	Successful Culture of the Rare Annual Hemiparasite Tomanthera auriculata (Michx.) Raf. (Scrophulariaceae)
A. B. Gutierrez, Herz W.	1990	Ambrosanolides and other constituents of two rudbeckia species.
J. S. Al-Atabee, Mulligan, B. J., Power, J. B.	1990	Interspecific somatic hybrids ofRudbeckia hirta andR. Laciniata (Compositae)
R. L. Harkess, Lyons R. E.	1994	Floral Initiation in Rudbeckia hirta (Asteraceae) Under Limited Inductive Photoperiodic Treatments
D. E. Moerman	1998	Native American Ethnobotany
N. L. Bradley, A. Leopold, C., Ross, J., Huffaker, W.	1999	Phenological changes reflect climate change in Wisconsin
W. Cullina, Society N. England Wi	2000	The New England Wild Flower Society Guide to Growing and Propagating Wildflowers of the United States and Canada: A Guide to Growing and Propagating Native Flowers of North America
L. E. Urbatsch, Baldwin, B. G., Donoghue, M. J.	2000	Phylogeny of the Coneflowers and Relatives (Heliantheae: Asteraceae) Based on Nuclear rDNA Internal Transcribed Spacer (ITS) Sequences and Chlorplast DNA Restriction Site Data
A. H. Chappelka, Neufeld, H. S., Davison, A. W., Somers, G. L., Renfro, J. R.	2003	Ozone injury on cutleaf coneflower (Rudbeckia laciniata) and crown-beard (Verbesina occidentalis) in Great Smoky Mountains National Park
J. L. Da Silva, Soares, D. J., Barreto, R. W.	2005	Eye-spot of Rudbeckia laciniata caused by Corynespora cassiicola in Brazil
B. Molano-Flores	2005	Population Viability AssessmentforSullivant’s coneflower (Rudbeckia fulgida Aiton var. sullivantii (C. L. Boynt. &Beadle) Cronq.)
M. M. Cimpeanu, Cimpeanu, C. S., Capraru, G., Costea, A.	2005	Preliminary Karyotype Analysis in Members of Asteraceae Family
L. E. Grulke, Neufeld, H. S., Davison, A. W., Roberts, M., Chappelka, A. H.	2006	Stomatal behavior of ozone-sensitive and -insensitive coneflowers ( Rudbeckia laciniata var. digitata ) in Great Smoky Mountains National Park
J. L. Strother	2006	Flora of North America
L. E. Urbatsch, Cox P. B.	2006	Rudbeckia
L. Scott, Molano-Flores B.	2007	Reproductive Ecology of Rudbeckia Fulgida Ait. Var. Sullivantii (C. L. Boynt and Beadle) Cronq. (Asteraceae) in Northeastern Illinois
I. E. Palmer, Ranney, T. G., Lynch, N. P., Bir, R. E.	2009	Crossability, Cytogenetics, and Reproductive Pathways in Rudbeckia Subgenus Rudbeckia
N. R. C. S. USDA	2010	The PLANTS Database

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