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Brunton, D.F. and Sokoloff, P.C. 2020. A Review of North American Isoetes engelmannii (Isoetaceae) complex hybrids, including the description of I. × fernaldii, hyb. nov. and I. × karenae, hyb. nov. Webbia. 75, 1 (Jul. 2020), 35–50. DOI:https://doi.org/10.36253/jopt-8355.