Aurantioideae

Aurantioideae (sometimes known as Citroideae) is the subfamily within the rue and citrus family (Rutaceae) that contains the citrus. The subfamily's center of diversity is in the monsoon region of eastern Australasia, extending west through South Asia into Africa, and eastwards into Polynesia.^[1]

Aurantioideae
Swinglea glutinosa, tabog
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Sapindales
Family:	Rutaceae
Subfamily:	Aurantioideae Eaton
Genera
See text.
Synonyms
Citroideae

Notable members include citrus (genus Citrus), bael (Aegle marmelos), curd fruit (Limonia acidissima), species of genus Murraya such as curry tree (M. koenigii) and orange jessamine (M. paniculata), and the small genus Clausena.

Description

Micromelum minutum

Aurantioideae are smallish trees or large shrubs, or rarely lianas. Their flowers are typically white and fragrant. Their fruit are very characteristic hesperidia, usually of rounded shape and colored in green, yellowish or orange hues.^[1]

Taxonomy

The subfamily has been divided into two tribes, the ancestral Clauseneae and the more advanced Citreae, as in a 1967 classification.^[1] A 2021 classification by Appelhans et al. based on a molecular phylogenetic study of almost 90% of the genera of the family Rutaceae places about 27 genera in the subfamily, stating that it was not yet feasible to produce a division into tribes.^[2] Other sources vary in the precise genera they accept.

Genera

Genera placed in Aurantioideae in Appelhans et al.'s 2021 classification of the Rutaceae into subfamilies are:^[2]

• Aegle Corrêa – bael
• Aeglopsis Swingle
• Afraegle Engl.
• Atalantia Corrêa
• Balsamocitrus Stapf
• Bergera J.Koenig ex L. – may be included in Murraya^[3]
• Burkillanthus Swingle
• Citropsis (Engl.) Swingle & M.Kellerm. – cherry oranges
• Citrus L. – citrus fruits (including Eremocitrus, Microcitrus and Poncirus)
• Clausena Burm.f.
• Feroniella Swingle – may be included in Citrus^[4]
• Glycosmis Corrêa
• Limnocitrus Swingle – may be included in Pleiospermium^[5]
• Limonia L. – curd fruit
• Luvunga Buch.-Ham. ex Wight & Arn.
• Merope M.Roem.
• Merrillia Swingle
• Micromelum Blume
• Monanthocitrus Tanaka
• Murraya J.Koenig ex L.
• Naringi Adans.
• Pamburus Swingle
• Paramignya Wight
• Pleiospermium Swingle
• Swinglea Merr.
• Triphasia Lour.
• Wenzelia Merr.

Genera that are not listed by Appelhans et al. include:^[2]

• Clymenia Swingle – may be included in Citrus^[6]

References

1. Swingle, W. T. & Reece, P.C. (1967), The botany of Citrus and its wild relatives, University California Press, Los Angeles, CA., archived from the original on 2011-07-19
2. Appelhans, Marc S.; Bayly, Michael J.; Heslewood, Margaret M.; Groppo, Milton; Verboom, G. Anthony; Forster, Paul I.; Kallunki, Jacquelyn A. & Duretto, Marco F. (2021). "A new subfamily classification of the Citrus family (Rutaceae) based on six nuclear and plastid markers". Taxon. doi:10.1002/tax.12543. hdl:11343/288824.
3. "Bergera J.Koenig ex L.". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-09-14.
4. "Feroniella Swingle". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-09-16.
5. "Limnocitrus Swingle". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-09-14.
6. Stevens, P.F., "Rutaceae Genera", Angiosperm Phylogeny Website, Missouri Botanical Garden, retrieved 2021-09-12

Bibliography

• de Araújo, E. Freitas; de Queiroz, L. Paganucci & Machado, M.A. (2003): What is Citrus? Taxonomic implications from a study of cp-DNA evolution in the tribe Citreae (Rutaceae subfamily Aurantioideae). Organisms Diversity & Evolution 3(1): 55-62. doi:10.1078/1439-6092-00058 (HTML abstract)