Biblio

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1962
Robert E. Perdue, J.. (1962).  Two New Varieties and a New Combination in Rudbeckia. Rhodora Journal of the New England Botanical Club. 64, 328-329.
1957
Robert E. Perdue, J.. (1957).  Synopsis of Rudbeckia Subgenus Rudbeckia. Rhodora Journal of the New England Botanical Club. 59,