For Gentiana
Drake, J. 2011. Gentians of the eastern United States. Breath O' Spring Press, Suwanee, GA. 219 pp.
Favre, A., J.S. Pringle, J. Heckenhauer, E. Kozuharova, Q. Gao, E. Moriarty Lemmon, A.R. Lemmon, H. Sun, N. Tkach, S. Gebauer, S.‐S. Sun, P.-C. Fu. 2020. Phylogenetic relationships and sectional delineation within Gentiana (Gentianaceae). Taxon 69(6): 1221-1238.
Halda, J.J. 1996. The genus Gentiana. SEN, Dobré.
Ho, T.-N., and S.-W. Liu. 1990. The infrageneric classification of Gentiana (Gentianaceae). Bull. Br. Mus. Nat. Hist. (Bot.) 20: 169-192.
Ho, T.-N., and S.-W. Liu. 2001. A worldwide monograph of Gentiana. Science Press, Beijing.
Pringle, J.S. 1967. Taxonomy of Gentiana, section Pneumonanthe, in eastern North America. Brittonia 19: 1-32.
Pringle, J.S. 1977. Gentiana linearis (Gentianaceae) in the Southern Appalachians. Castanea 42: 1-8.
Pringle, J.S., and A.S. Weakley. 2009. Gentiana latidens (Gentianaceae), the Balsam Mountain gentian. Rhodora 111: 389-397.
Struwe, L., and J.S. Pringle. 2018. Gentianaceae. In Kadereit, J., & V. Bittrich. 2018. The families and genera of flowering plants. XV. Flowering plants. Eudicots. Apiales, Gentianales (except Rubiaceae). Springer, Cham.
Weakley, A.S., and D.B. Poindexter. 2020a. Continued recognition of Hexastylis, with two species transferred to Hexastylis from Asarum. In Weakley, A.S., D.B. Poindexter, H.C. Medford, B.A. Sorrie, C.A. McCormick, E.L. Bridges, S.L. Orzell, K.A. Bradley, H.E. Ballard, Jr., R.N. Burwell, S.L. Lockhart, and A.R. Franck. 2020. Studies in the vascular flora of the southeastern United States. VI. J. Bot. Res. Inst. Texas 14: 199-240.
Yuan, Y.-M., P. Küpfer, & J.J. Doyle. 1996. Infrageneric phylogeny of the genus Gentiana (Gentianaceae) inferred from nucleotide sequences of the internal transcribed spacers (ITS) of nuclear ribosomal DNA. Amer. J. Bot. 83: 641-652.
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