Hydrangeaceae

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.^[3]

Hydrangeaceae
Hydrangea macrophylla, a member of the subfamily Hydrangeoideae
Fendlera rupicola, a member of the subfamily Jamesioideae
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Cornales
Family:	Hydrangeaceae Dumort.[1]
Genera
See text
Synonyms[2]
Kirengeshomaceae Nakai Philadelphaceae Martinov

Hydrangea hydrangeoides, a member of the now-synonymised genus Schizophragma

Description

The genera are characterised by leaves in opposite pairs (rarely whorled or alternate), and regular, bisexual flowers with four (rarely 5–12) petals. The fruit is a capsule or berry containing several seeds, the seeds with a fleshy endosperm.^[4]

Genera

The following genera are accepted:^[5]

• Carpenteria Torr.
• Deutzia Thunb.
• Fendlera Engelm. & A.Gray
• Fendlerella A.Heller
• Hydrangea Gronov. ex L.
• Jamesia Torr. & A.Gray
• Kirengeshoma Yatabe
• Philadelphus L.
• Whipplea Torr.

Phylogeny

The family Hydrangeaceae has two subfamilies, namely Jamesioideae and Hydrangeoideae. The subfamily Jamesioideae comprises the genera Jamesia and Fendlera.^[6][7] They are the sister group to the remaining Hydrangeaceae.^[7][8] The subfamily Hydrangeoideae has two tribes:^[9][7][8] Hydrangeae consists of Hydrangea s.l.,^[9] and Philadelpheae consists of Philadelphus, Carpenteria, Deutzia, Kirengeshoma, Whipplea, and Fendlerella.^[7][8] Carpenteria is the sister group to Philadelphus. Deutzia is the sister group to Kirengeshoma, and Fendlerella is the sister group to Whipplea.^[8][6][7] However the relationships among those three clades within the tribe Philadelphae are a bit unclear.^[8] The following cladogram summarizes results from different studies, and for each node it is noted which studies support the sister group positions of the following branches:

Hydrangeaceae[7][8]	Hydrangeoideae[7][8] Hydrangeae[7] Hydrangea s.l. (including Broussaisia, Cardiandra, Decumaria, Deinanthe, Dichroa, Pileostegia, Platycrater, and Schizophragma)[9] Philadelpheae[7] [7][6][9][8] Philadelphus Carpenteria [7] [6][7][8] Deutzia Kirengeshoma [6][7][8] Whipplea Fendlerella Jamesioideae[7][6][8] Jamesia Fendlera

References

1. Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. hdl:10654/18083.
2. "Family: Hydrangeaceae Dumort., nom. cons". Germplasm Resources Information Network. United States Department of Agriculture. 2003-01-17. Retrieved 2012-07-31.
3. Christenhusz, M. J. M.; Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
4. "Hydrangeaceae - FNA". floranorthamerica.org. Retrieved 2023-06-20.
5. "Hydrangeaceae Dumort". Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 30 June 2021.
6. Kim, C., Deng, T., Wen, J., Nie, Z. L., & Sun, H. (2015). "Systematics, biogeography, and character evolution of Deutzia (Hydrangeaceae) inferred from nuclear and chloroplast DNA sequences." Molecular Phylogenetics and Evolution, 87, 91-104.
7. Hufford, L., Moody, M. L., & Soltis, D. E. (2001). "A phylogenetic analysis of Hydrangeaceae based on sequences of the plastid gene matK and their combination with rbcL and morphological data." International Journal of Plant Sciences, 162(4), 835-846.
8. Kubitzki, K. (2013). "Flowering Plants. Dicotyledons: Celastrales, Oxalidales, Rosales, Cornales, Ericales." p. 206. Springer Berlin Heidelberg.
9. Samain, M. S., Wanke, S., & Goetghebeur, P. (2010). "Unraveling extensive paraphyly in the genus Hydrangea s.l. with implications for the systematics of tribe Hydrangeeae." Systematic Botany, 35(3), 593-600.