Oncidium

Oncidium
Oncidium altissimum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Tribe: Cymbidieae
Subtribe: Oncidiinae
Genus: Oncidium
Sw.
Type species
Oncidium altissimum
(Jacq.) Sw.
Synonyms[1]
  • Anachaste Lindl.
  • Chamaeleorchis Senghas & Lückel
  • Cochlioda Lindl.
  • Collare-stuartense Senghas & Bockemühl
  • Heteranthocidium Szlach., Mytnik & Romowicz
  • Matalbatzia Archila, the word "Type" or equivalent not used.
  • Mexicoa Garay
  • Miltoniastrum (Rchb.f.) Lindl.
  • Miltonioides Brieger & Lückel
  • Odontoglossum Kunth
  • Petalocentrum Schltr.
  • Roezliella Schltr.
  • Sigmatostalix Rchb.f.
  • Solenidiopsis Senghas
  • Symphyglossum Schltr., nom. cons.
  • Xeilyathum Raf.

Oncidium, abbreviated as Onc. in the horticultural trade,[2] is a genus that, as of December 2023, contains about 340 species of orchids from the subtribe Oncidiinae of the orchid family Orchidaceae. It is distributed across tropical and subtropical America from Mexico, Central America and the West Indies to northern Argentina, with one species (O. ensatum) extending into Florida.[3][4] Common names for plants in this genus include dancing-lady orchid[5] and golden shower orchid.

A 2008 molecular phylogenetic study labeled the Oncidium alliance "grossly polyphyletic."[6] In the same year, the American Orchid Society labeled the genus a "dumping ground".[7] A consensus announced in April 2013 resulted in major taxonomic changes to Oncidium, Gomesa, Odontoglossum, Miltonia, and others.[8] Much of this debate and subsequent housekeeping was initiated by significant research for the scientific publication Genera Orchidacearum Volume 5.[9] As a result, much of the information in this article is now deprecated, but still of great value. One significant change is the move of most Brazilian Oncidium with a fused lateral sepal to the genus Gomesa.[7][6] The Royal Horticultural Society system, the World Checklist of Monocots database[10] and the American Orchid Society have updated their databases to reflect most of these changes.

Description

This genus was first described by Olof Swartz in 1800 with the orchid Oncidium altissimum, which has become the type species. Its name is derived from the Greek word ὀγκος, onkos, meaning "swelling". This refers to the callus at the lower lip.

Most species in the genus are epiphytes (growing on other plants), although some are lithophytes (growing on rocks) or terrestrials (growing in soil). They are widespread from northern Mexico, the Caribbean, and some parts of South Florida to South America. They usually occur in seasonally dry areas.

They can be divided into three categories, according to their growth pattern:

  • Some have green pseudobulbs and long racemes with small flowers and a dominant lip. They are mostly golden yellow with or without reddish-brown barring, but some are brown or yellowish-brown. Other Oncidium species have white and pink blooms, while some even have startling, deep red colors in their flowers.
  • Another group has extremely small pseudobulbs and stiff, erect, solitary leaves. These cylindrical leaves act as a water reserve. They have long racemes with yellow flowers that seem to fan out at the top. Sizes of these orchids can vary from miniature plants of a couple of centimetres to giants with 30 cm-long leaves and racemes of more than one metre long. These species, known as the Mule-Ears, are now classed as Psychopsis.
  • Formerly there was a third group, called the Variegata or equitant oncidiums. They have no pseudobulbs, giving fan-shaped shoots of less than 15 cm, with triangular section leaves. These oval, broad and spongy leaves act as storage organs. Their flowers are most complicated with exquisite colors. The sepals are somewhat fleshy. The petals and the lip are membranaceous. These orchids are now classified as Tolumnia. Cyrtochilum is another genus that many Oncidium species have been reclassified into; Cyrtochilum species have extremely long, winding inflorescences that can sometimes reach 20' or more, curled petals that result in three-pointed blooms, and rambling growth habits in which each new pseudobulb appears on top of the old one.

Oncidium species are characterised by the following properties :

  • presence of column wings,
  • presence of a complicated callus on the lip (this can be used to separate the taxa),
  • pseudobulbs with one to three leaves,
  • several basal bracts at the base of the pseudobulbs.

The flowers come in shades of yellow, red, white and pink. The petals are often ruffled on the edges, as is the lip. The lip is enormous, partially blocking the small petals and sepals.

Some Oncidium orchids are very tall: Oncidium altissimum and Oncidium baueri can grow to a height of 5 m.

They are known as 'spray orchids' among some florists. They are very varied and are easily hybridised with other closely related genera forming the Oncidium alliance (Miltonia, Cuitlauzina, Miltoniopsis, Leochilus, Comparettia, Cyrtochilum, Tolumnia, Rhynchostele [formerly Lemboglossum], Psychopsis, etc.). Some of the best Oncidium alliance hybrids originate from Oncidium tigrinum and Oncidium incurvum when crossed with species formerly placed in Odontoglossum, although hybridization possibilities of this group of orchids are endless, and there are literally hundreds of thousands of hybrids in the Oncidium alliance.

Oncidium incurvum - another view
Florida orchid (Oncidium ensatum)
Oncidium

Selected species

Selected species accepted by Plants of the World Online as of December 2023:

Former species

Selected species not accepted by Plants of the World Online as of December 2023:

Nothogenera

Many hybrids have been created artificially involving species of Oncidium, often with species of other genera. Named hybrid genera (nothogenera) are listed in the table below, together with their parent genera. As of December 2023, Cochlioda and Odontoglossum are included within Oncidium,[1] and Baptistonia within Gomesa,[11] so that nothogenus names which include these three genera are redundant.

Nothogenera involving Oncidium[12]
Nothogenus Parents
× Adacidium Ada × Oncidium
× Adoncostele Ada × Oncidium × Rhynchostele
× Aliceara Brassia × Miltonia × Oncidium
× Arthurara Brassia × Miltonia × Oncidium × Rhynchostele
× Aspacidopsis Aspasia × Miltoniopsis × Oncidium
× Aspacidostele Aspasia × Oncidium × Rhynchostele
× Aspasium Aspasia × Oncidium
× Brapacidium Aspasia × Brassia × Oncidium
× Brascidostele Brassia × Oncidium × Rhynchostele
× Brassidiocentrum Brassia × Oncidium × Trichocentrum
× Brassidium Brassia × Oncidium
× Brassidomesa Brassia × Gomesa × Oncidium
× Brassoncidopsis Brassia × Miltoniopsis × Oncidium
× Crawshayara Aspasia × Brassia × Miltonia × Oncidium
× Cuitlacidium Cuitlauzina × Oncidium
× Cyrtocidistele Cyrtochilum × Oncidium × Rhynchostele
× Cyrtocidium Cyrtochilum × Oncidium
× Cyrtoncidopsis Cyrtochilum × Miltoniopsis × Oncidium
× Dunningara Aspasia × Miltonia × Oncidium
× Gomiltidium Gomesa × Miltonia × Oncidium
× Gomonciada Ada × Gomesa × Oncidium
× Gomoncidochilum Cyrtochilum × Gomesa × Oncidium
× Howeara Leochilus × Oncidium × Rodriguezia
× Lockcidium Lockhartia × Oncidium
× Milenkocidium Miltonia × Oncidium × Zelenkoa
× Milmilcidium Miltonia × Miltoniopsis × Oncidium
× Milonzina Cuitlauzina × Miltonia × Oncidium
× Miltadium Ada × Miltonia × Oncidium
× Miltoncentrum Miltonia × Oncidium × Trichocentrum
× Miltoncidostele Miltonia × Oncidium × Rhynchostele
× Miltonidium Miltonia × Oncidium
× Oncidesa Gomesa × Oncidium
× Oncidettia Comparettia × Oncidium
× Oncidopsis Miltoniopsis × Oncidium
× Oncidpilia Oncidium × Trichopilia
× Oncidumnia Oncidium × Tolumnia
× Oncostele Oncidium × Rhynchostele
× Oncostelopsis Miltoniopsis × Oncidium × Rhynchostele
× Otorhynchocidium Oncidium × Otoglossum × Rhynchostele
× Pettitara Ada × Brassia × Oncidium
× Psychocidium Oncidium × Psychopsis
× Reicheara Aspasia × Miltonia × Miltoniopsis × Oncidium
× Rodricidium Oncidium × Rodriguezia
× Scelodium Oncidium × Scelochilus
× Schunkeara Brassia × Miltonia × Miltoniopsis × Oncidium
× Trichocidium Oncidium × Trichocentrum
× Warneara Comparettia × Oncidium × Rodriguezia
× Zelencidiostele Oncidium × Rhynchostele × Zelenkoa
× Zelencidopsis Miltoniopsis × Oncidium × Zelenkoa
× Zelenkocidium Oncidium × Zelenkoa

References

  1. ^ a b "Oncidium Sw." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-12-22.
  2. ^ "My Huge List of Orchid Abbreviations". 13 June 2014.
  3. ^ "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org.
  4. ^ Flora of North America, v 26 p 648, Oncidium ensatum
  5. ^ NRCS. "Oncidium". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 22 July 2015.
  6. ^ a b Chase, Mark W.; Williams, Norris H.; Faria, De; Donisete, Aparacida; Neubig, Kurt M.; Amaral, Maria do Carmo E.; Whitten, W. Mark (1 August 2009). "Floral convergence in Oncidiinae (Cymbidieae; Orchidaceae): an expanded concept of Gomesa and a new genus Nohawilliamsia". Annals of Botany. 104 (3): 387–402. doi:10.1093/aob/mcp067. PMC 2720657. PMID 19346522 – via aob.oxfordjournals.org.
  7. ^ a b Lindleyana : The scientific journal of the American Orchid Society. December 2008 Pg 20
  8. ^ "Kew News - Orchid community agree name changes in Oncidium". Archived from the original on 2013-06-24.
  9. ^ Alec M. Pridgeon; Phillip Cribb; Mark W. Chase; Finn N. Rasmussen (eds.). "Genera Orchidacearum Volume 5 Epidendroideae (Part II)".
  10. ^ "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org.
  11. ^ "Baptistonia Barb.Rodr." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-12-24.
  12. ^ "Alphabetical One-Table List of Genera and Intergeneric Hybrids" (PDF). Royal Horticultural Society. 2017. Archived from the original (PDF) on 2023-03-23. Retrieved 2023-12-24.
  • Media related to Oncidium at Wikimedia Commons
  • Data related to Oncidium at Wikispecies

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