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For Rudbeckia

Campbell, J.J.N., and W.R. Seymour, Jr. 2013. Towards a revision of the Rudbeckia fulgida complex (Asteraceae), with description of a new species from the blacklands of southern USA. Phytoneuron 2013-91: 1-27.

Cronquist, A. 1980. Asteraceae, Volume I, Vascular flora of the Southeastern United States. University of North Carolina Press, Chapel Hill, N.C.

Kelley, J.M. 2023a. Rudbeckia grandiflora var. alismifolia (Asteraceae) in Oklahoma. Phytologia 105(1): 15-17.

Perdue, R.E., Jr. 1957. Synopsis of Rudbeckia subgenus Rudbeckia. Rhodora 59: 293-299.

Urbatsch, L.E., and P.B. Cox. 2006a. Rudbeckia. In Flora of North America Editorial Committee. 2006c. Flora of North America north of Mexico. Volume 21, Magnoliophyta: Asteridae, part 6: Asteraceae, part 3. Oxford Univ. Press, New York, NY. 616 pp.

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