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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Ordo: Asparagales

Familia: Orchidaceae
Subfamilia: Epidendroideae
Tribus: Vandeae
Subtribus: Polystachyinae
Genera: (2)
Hederorkis – Polystachya
Name

Polystachyinae Schltr. Orchideen, 292. (1914)

Typus: Polystachya Hook. Exot. Fl. 2: t. 103 (1824), nom. cons.

References

Schlechter, F.R.R. (1914) Die Orchideen 292.
Mytnik, E.J. (2011) A Monograph of the Subtribe Polystachyinae Schltr. (Orchidaceae), Koenigstein: Koeltz.#
Pridgeon, A.M., Cribb, P.J., Chase, M.W. & Rasmussen, F.N. (eds.) 2014. Genera Orchidacearum Volume 6: Epidendroideae (Part three); page 450 ff., Oxford: Oxford University Press. ISBN 978-0-19964-651-7
Tropicos.org (2012). Polystachyinae. Missouri Botanical Garden. Published online. Accessed: 13 Oct. (2012).
Emonocot.org 2013. Polystachyinae in The Orders and Families of Monocotyledons. Published online. Accessed: 2013 May 12.

Polystachyinae is a subtribe within the tribe Vandeae in family Orchidaceae. It consists of 4 genera and about 228 known species. The type genus of this subtribe is Polystachya. The group is pantropical, being native to tropical Africa primarily, but also to tropical America.[1] Members of this group are epiphytic and are distinguished from the other subtribes in the tribe Vandeae by their sympodial growth habit and the presence of four pollinia. Pollination is mostly by small species of bees, however some species (e.g. Polystachya concrete) exhibit auto-pollination.[2]
Genera

Genera in this subtribe are listed below:

Hederorkis Thouars, 1809 (2 sp.)
Imerinaea Schltr., 1924 (1 sp.)
Neobenthamia Rolfe, 1891 (1 sp.)
Polystachya Hook., 1824 (224 spp.)

References

Dressler, Robert L. Phylogeny and classification of the orchid family. (1993). p. 128. Cambridge University Press.
Cingel, Nelis A. An Atlas of orchid pollination: America, Africa, Asia and Australia. (2001) CRC Press.

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