For Heuchera
Folk, R.A., and J.V. Freudenstein. 2014. Phylogenetic relationships and character evolution in Heuchera (Saxifragaceae) on the basis of multiple nuclear loci. Amer. J. Bot. 101: 1532-1550.
Folk, R.A., and J.V. Freudenstein. 2015. "Sky islands" in the eastern U.S.A.? – Strong phylogenetic structure in the Heuchera parviflora group (Saxifragaceae). Taxon 64: 254-271.
Folk, R.A., J.C. Ginori, D.E. Soltis, and A.J. Floden. 2018. Integrative identification of incipient lineages in Heuchera longiflora (Saxifragaceae). Bot. J. Linn. Soc. 2018, 187, 327-345.
Rosendahl, C.O., F.K. Butters, and O. Lakela. 1936. A monograph on the genus Heuchera. Minnesota Studies in Plant Science 2: 1-180.
Schuette, S., R.A. Folk, J.T. Cantley, and C.T. Martine. 2018. The hidden Heuchera: How science Twitter uncovered a globally imperiled species in Pennsylvania, USA. PhytoKeys 96: 87-97. https://doi.org/10.3897/phytokeys.96.23667
Soltis. 2007. In Kubitzki, K., C. Bayer, and P.F. Stevens, eds. 2007. The families and genera of vascular plants. IX. Flowering plants – Eudicots – Berberidopsidales, Buxales, Crossosomatales, Fabales p.p., Geraniales, Gunnerales, Myrtales p.p., Proteales, Saxifragales, Vitales, Zygophyllales, Clusiaceae alliance, Passifloraceae alliance, Dilleniaceae, Huaceae, Picramniaceae, Sabiaceae. Springer, Berlin. 509 pp.
Wells, E.F. 1979. Interspecific hybridization in eastern North American Heuchera (Saxifragaceae). Syst. Bot. 4: 319-338.
Wells, E.F. 1984. A revision of the genus Heuchera (Saxifragaceae) in eastern North America. Systematic Bot. Monographs 3: 45-121.
Wells, E.F., and B.G. Shipes. 2009. Heuchera. In Flora of North America Editorial Committee. 2009. Flora of North America north of Mexico. Volume 8, Magnoliophyta: Paeoniaceae to Ericaceae. Oxford Univ. Press, New York, NY. 585 pp.
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