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Orchidoideae
	Neotinea tridentata subsp. commutata
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Orchidaceae
Subfamily:	Orchidoideae
Tribes
	See text

The Orchidoideae, or the orchidoid orchids, are a subfamily of the orchid family (Orchidaceae) that contains around 3630 species.^[1] Species typically have a single (monandrous), fertile anther which is erect and basitonic.

Description

The subfamily Orchidoideae and the previously recognized subfamily Spiranthoideae are considered the closest allies in the natural group of the monandrous orchids because of several generally shared characters:

a shared terrestrial habit
sectile (capable of being severed) or granular pollinia
erect anthers.

Taxonomy

Phylogeny of the Orchidoideae is volatile and still subject to change.^[2] Historically, the Orchidoideae have been partitioned into up to 6 tribes, including Orchideae, Diseae, Cranichideae, Chloraeeae, Diurideae, and Codonorchideae. However, the most recent molecular phylogenetics analysis led by Chase et al. in 2015 and subsequently by Chen et al. in 2017 indicates that the Orchidoideae should be split into 4 tribes: the Orchideae, Cranichideae, Diurideae, and Codonorchideae.^[2]^[3]^[4]

Codonorchideae

This monophyletic tribe consists of only one genus, Codonorchis, found in South America.^[2]

Cranichideae

This cosmopolitan tribe comprises 8 currently accepted subtribes. Molecular evidence suggests that the former Chloraeeae are sister to the rest of the Cranichideae. As such, the Chloraeeae are now considered a subtribe of the Cranichideae.^[2] Moreover, based on morphological and genetic evidence, the genus Discyphus was elevated out of the Spiranthinae to form its own monophyletic subtribe, the Discyphinae.^[2]

Cranichideae

	Discyphinae

	Cranichidinae

Orchideae

Once divided into the Orchidinae and Habenariinae^[3] (a nonsystematic paraphyletic splitting), the Orchideae now comprise 6 subtribes.^[5]^[4] Along with previous molecular studies, Chase et al's 2015 analysis confirmed that Diseae was a polyphyletic grouping. Consequently, the former subtribes of Diseae have been redistributed within the Orchideae (for instance, Satyrium is now classified in the Orchidinae). In his 2015 study Chase recommended further study of historically problematic genera in the former Diseae such as Huttonaea and Pachites. Further molecular analysis by Chen et al. in 2017 led to the following reorganization:^[2]^[4]

Orchideae

	Coryciinae

	Disinae

Diurideae

The Diurideae, a predominantly Australasian tribe, retain their previous subtribal organization and comprise 9 taxa:^[2]

Acianthinae (monophyletic)
Caladeniinae (polyphyletic)
Cryptostylidinae (monophyletic)
Diuridinae (monophyletic)
Drakaeinae (monophyletic)
Megastylidinae (monophyletic)
Prasophyllinae (monophyletic)
Rhizanthellinae (monophyletic)
Thelymitrinae (monophyletic)

References

^ "Types of Orchids: A Visual Compendium". FTD.com. 1 March 2018. Retrieved 11 December 2021.
^ ^a ^b ^c ^d ^e ^f ^g Chase, Mark W.; Cameron, Kenneth M. (2015). "An updated classification of Orchidaceae". Botanical Journal of the Linnean Society. 177 (2): 151–174. doi:10.1111/boj.12234 – via Oxford Academic.
^ ^a ^b RICHARD M. BATEMAN; PETER M. HOLLINGSWORTH; JILLIAN PRESTON; LUO YI-BO; ALEC M. PRIDGEON; MARK W. CHASE (May 2003). "Molecular phylogenetics and evolution of Orchidinae and selected Habenariinae (Orchidaceae)". Botanical Journal of the Linnean Society. 142 (1): 1–40. doi:10.1046/j.1095-8339.2003.00157.x.
^ ^a ^b ^c Chen, Gui-Zhen; Huang, Jie; Zhang, Guo-Qiang; Ma, Liang; Chen, Shi-Pin (2017-11-28). "New subtribe Pachitinae (Orchideae) of Orchidaceae: Evidence from morphological and molecular analyses". Phytotaxa. 329 (2): 114. doi:10.11646/phytotaxa.329.2.2. ISSN 1179-3163.
^ Jin, Wei-Tao; Schuiteman, André; Chase, Mark W.; Li, Jian-Wu; Chung, Shih-Wen; Hsu, Tian-Chuan; Jin, Xiao-Hua (2017). "Phylogenetics of subtribe Orchidinae s.l. (Orchidaceae; Orchidoideae) based on seven markers (plastid matK, psaB, rbcL, trnL-F, trnH-psba, and nuclear nrITS, Xdh): implications for generic delimitation". BMC Plant Biology. 17 (1): 222. doi:10.1186/s12870-017-1160-x. PMC 5702240. PMID 29178835.

Pridgeon, A.M., P.J. Cribb, M.W. Chase and F.N. Rasmussen [eds.]. 2003. Genera Orchidacearum vol. 3: Orchidoideae part 2, Vanilloideae. Oxford University Press, Oxford, U.K.
Salazar, G.A., M.W. Chase, M.A. Soto Arenas and M. Ingrouille. 2003. Phylogenetics of Cranichideae with emphasis on Spiranthinae (Orchidaceae, Orchidoideae): evidence from plastid and nuclear DNA sequences. American Journal of Botany 90: 777-795.
Salazar, G.A., L.I. Cabrera, S. Madriñán and M.W. Chase. 2009. Phylogenetic relationships of Cranichidinae and Prescottiinae (Orchidaceae, Cranichideae) inferred from plastid and nuclear DNA sequences. Annals of Botany 104: 403-416. [1]