For Hydrangeaceae
Freeman, C.C. 2016a. Hydrangeaceae. In Flora of North America Editorial Committee. 2016. Flora of North America north of Mexico. Volume 12, Magnoliophyta: Vitaceae to Garryaceae. Oxford Univ. Press, New York, NY. 603 pp.
Hufford (2004) In Kubitzki, K., ed. 2004. The families and genera of vascular plants. VI. Flowering plants – Dicotyledons – Celastrales, Oxalidales, Rosales, Cornales, Ericales. Springer, Berlin. 489 pp.
Morgan, D.R., and D.E. Soltis. 1993. Phylogenetic relationships among members of Saxifragaceae sensu lato based on rbcL sequence data. Ann. Mo. Bot. Gard. 80: 631-660.
Soltis, D.E., Q.-Y. Xiang, and L. Hufford. 1995. Relationships and evolution of Hydrangeaceae based on rbcL sequence data. Amer. J. Bot. 82: 504-514.
Spongberg, S.A. 1972. The genera of Saxifragaceae in the southeastern United States. J. Arnold Arb. 53: 409-498.
Xiang, Q.-Y. (Jenny), M.L. Moody, D.E. Soltis, C.z. Fan, and P.S. Soltis. 2002. Relationships within Cornales and circumscription of Cornaceae – matK and rbcL sequence data and effects of outgroups and long branches. Molecular Phylogenetics and Evolution 24: 35-57.
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