For Alnus
Banaev, E.V., and R.V. Adel'shin. 2009. Structure of Alnus fruticosa Rupr. s. l. and its relationships with other taxa of subgenus Alnobetula (Ehrhart) Peterman. Contemporary Problems of Ecology 2 (6): 601-610.
Chen, Z. D., and J. Li. 2004. Phylogenetics and biogeography of Alnus (Betulaceae) inferred from sequences of nuclear ribosomal DNA ITS region. Int. J. Plant Sci. 165: 325-335.
Chery, J. 2015. New nomenclature combinations in the green alder species complex (Betulaceae). PhytoKeys 56: 1-6.
Furlow, J.J. 1990. The genera of Betulaceae in the southeastern United States. J. Arnold Arb. 71: 1-67.
Furlow, J.J. 1997. Betulaceae. In Flora of North America Editorial Committee. 1997. Flora of North America north of Mexico. Volume 3, Magnoliophyta: Magnoliidae and Hamamelidae. Oxford Univ. Press, New York, NY. 590 pp.
Gray, A. 1842. Notes of a botanical excursion to the mountains of North Carolina, &c.; with remarks on the botany of the higher Alleghany Mountains (in a latter to Sir Wm. J. Hooker. Am J. Sci. 42 (1): 1-49.
Hardin, J.W. 1971a. Studies of the southeastern United States flora. I. Betulaceae. J. Elisha Mitch. Sci. Soc. 87:39-41.
Kubitzki, K., J.G. Rohwer, and V. Bittrich, eds. 1993. The families and genera of vascular plants. II. Flowering plants – Dicotyledons – Magnoliid, Hamamelid and Caryophyllid families. Springer, Berlin. 653 pp.
Navarro, E., J. Bousquet, A. Moiroud, A. Munive, D. Piou, and P. Normand. 2003. Molecular phylogeny of Alnus (Betulaceae), inferred from nuclear ribosomal DNA ITS sequences. Plant and Soil 254: 201-217.
Schrader, J.A., and W.R. Graves. 2002. Infraspecific systematics of Alnus maritima (Betulaceae) from three widely disjunct populations. Castanea 67: 380-401.