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Publication 617, Department of Botany and Plant Pathology, The Ohio State University.
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Fisher, T.R. Natural hybridization between silphium laciniatum and silphium terebinthinaceum. Brittonia 11, 250–254 (1959). https://doi.org/10.2307/2805009
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DOI: https://doi.org/10.2307/2805009