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This paper is based partly on a dissertation submitted to the faculty of the Department of Botany of Indiana University. The investigation has been aided by grants from the Indiana University Graduate School Research Committee and Sigma Xi. I wish to express my appreciation to Dr. C. B. Heiser and to the curators of the herbaria (abbreviated herein according toIndex Herbariorum ed. 4, 1959) who kindly made material available. Also, thanks are due the numerous persons who supplied seed or otherwise assisted in this study.
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Torres, A.M. Taxonomy of zinnia. Brittonia 15, 1–25 (1963). https://doi.org/10.2307/2805035
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DOI: https://doi.org/10.2307/2805035