Hydrangeaceae is a family of flowering plants in the order Cornales, with a wide distribution in Asia and North America, and locally in southeastern Europe. it comprises nine (or fewer) genera with 223 known species.
In its broad sense (as treated by the Angiosperm Phylogeny Group), the family includes 17 genera, but some botanists divide the family into two, with seven genera split off into a separate family, Philadelphaceae.
The genera are characterised by leaves in opposite pairs (rarely whorled or alternate), and regular, bisexual flowers with 4 (rarely 5-12) petals. The fruit is a capsule or berry containing several seeds, the seeds with a fleshy endosperm.
- Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 2013-07-06.
- "Family: Hydrangeaceae Dumort., nom. cons.". Germplasm Resources Information Network. United States Department of Agriculture. 2003-01-17. Retrieved 2012-07-31.
- Christenhusz, M. J. M., and Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa (Magnolia Press) 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
- "GRIN Genera of Hydrangeaceae". Germplasm Resources Information Network. United States Department of Agriculture. Retrieved 2012-07-31.
- Hydrangeaceae and Philadelphaceae in L. Watson and M.J. Dallwitz (1992 onwards). The families of flowering plants.
- "Hydrangeaceae". Integrated Taxonomic Information System. Retrieved 29 June 2003.
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