Accepted By:
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Flora of North America Editorial Committee. 2019. Magnoliophyta: Tetrachondraceae to Orobanchaceae. 17: i–xxiv, 1–737. In Flora of North America Editorial Committee (eds.) Fl. N. Amer.. Oxford University Press, New York.
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Gleason, H. A. 1968. The Sympetalous Dicotyledoneae. vol. 3. 596 pp. In H. A. Gleason Ill. Fl. N.E. U.S.. New York Botanical Garden, New York.
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Gleason, H. A. & A. J. Cronquist. 1991. Man. Vasc. Pl. N.E. U.S. (ed. 2) i–910. New York Botanical Garden, Bronx.
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Sánchez, J. A., M. M. Martínez Ortega, S. Cafferty & E. Rico. 2012. A contribution toward clarifying the nomenclature of Veronica L. (Plantaginaceae). Taxon 61(4): 867–870.
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Voss, E. G. 1996. Michigan Flora, Part III: Dicots (Pyrolaceae-Compositae). Cranbrook Inst. of Science, Ann Arbor.
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