Trachoma (plant)

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Trachoma
Naturalis Biodiversity Center - L.2096091 - Saccolabium rhopalorrhachis J. J. Smith - Artwork - cropped.jpg
Illustration of Trachoma rhopalorrhachis by Johannes Jacobus Smith
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Tribe: Vandeae
Subtribe: Aeridinae
Genus: Trachoma
Garay [1]
Type species
Trachoma rhopalorrhachis

Trachoma, commonly known as spectral orchids, [2] is a genus of flowering plants in the family Orchidaceae. Orchids in this genus are epiphytic plants with leafy stems, crowded, leathery leaves arranged in two ranks and a large number of relatively small, short-lived flowers that often open in successive clusters. The sepals and petals are free from and more or less similar to each other, except that the petals are often smaller. The labellum is rigidly fixed to the column and is more or less sac-shaped. There are about 17 species distributed from Assam to the Western Pacific Ocean. Most species grow in rainforests, often on emergent trees such as hoop pine ( Araucaria cunninghamii ).

Contents

Description

Orchids in the genus Trachoma are evergreen, epiphytic, monopodial herbs with long branching roots mostly adhering to the trees on which they grow. The stems are relatively short, thick and leafy. The leaves are leathery, crowded and arranged in two ranks with their bases sheathing the stem. A large number of relatively small resupinate flowers are arranged on a short, sometimes club-shaped flowering stem. The flowers are usually short-lived, sometimes only lasting for a few hours. The sepals are free from and more or less similar to each other. The petals are free from each other and usually narrower than the sepals. The labellum is stiffly attached to the column with a short, sac-like spur and three lobes. The side lobes large and erect, the middle lobe often fleshy. [2] [3] [4]

Taxonomy and naming

The genus Trachoma was first formally described in 1972 by Leslie Andrew Garay in Botanical Museum Leaflets, Harvard University. [1] [5] The name Trachoma is an Ancient Greek words meaning "roughness", [6] referring to "the short inflorescence which is quite rough because of the remnants of densely packed bracts." [5]

Within the family Orchidaceae, the genus is classified in the subfamily Epidendroideae, tribe Vandeae, and subtribe Aeridinae. [7] It is closely related to Tuberolabium . [7]

Species

The following is a list of species of Trachoma recognised by the World Checklist of Selected Plant Families as of January 2019:

Distribution and habitat

Orchids in the genus Trachoma usually grow in rainforest often on emergent trees such as hoop pine. They are found in Assam, Myanmar, Thailand, Vietnam, Borneo, Java, Peninsular Malaysia, the Maluku Islands, the Philippines, Indonesia, New Guinea, the Solomon Islands, northern Australia, Fiji, Niue, New Caledonia, Vanuatu, the Cook Islands, the Society Islands, Tubuai and the Northern Mariana Islands. Three species occur in Australia and one in New Guinea. [1] [2] [4]

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<i>Robiquetia</i> Genus of orchids

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<i>Grosourdya</i> Genus of orchids

Grosourdya is a genus of flowering plants from the orchid family, Orchidaceae. As of May 2022, it contains 26 known species, native to Southeast Asia.

  1. Grosourdya appendiculata(Blume) Rchb.f. - widespread from Hainan to the Andaman Islands to the Philippines and Maluku
  2. Grosourdya bicornutaJ.J.Wood & A.L.Lamb - Sabah
  3. Grosourdya bigibba (Schltr.) Kocyan & Schuit.
  4. Grosourdya calliferaSeidenf. - Thailand
  5. Grosourdya ciliata (Ridl.) Kocyan & Schuit.
  6. Grosourdya decipiens (J.J.Sm.) Kocyan & Schuit.
  7. Grosourdya emarginata (Blume) Rchb.f.
  8. Grosourdya fasciculata (Carr) Kocyan & Schuit.
  9. Grosourdya incurvicalcar(J.J.Sm.) Garay - Java, Peninsular Malaysia, Sulawesi
  10. Grosourdya leytensis (Ames) Kocyan & Schuit.
  11. Grosourdya lobata Kocyan & Schuit.
  12. Grosourdya milneri P.O'Byrne, Gokusing & J.J.Wood
  13. Grosourdya mindanaensis (Ames) Kocyan & Schuit.
  14. Grosourdya minutiflora(Ridl.) Garay - Pahang
  15. Grosourdya minutissima P.T.Ong & P.O'Byrne
  16. Grosourdya multistrata P.O'Byrne, J.J.Verm. & S.M.L.Lee
  17. Grosourdya muscosa(Rolfe) Garay - Peninsular Malaysia, Thailand, Andaman Islands
  18. Grosourdya myosurus (Ridl.) Kocyan & Schuit.
  19. Grosourdya nitida (Seidenf.) Kocyan & Schuit.
  20. Grosourdya pulvinifera(Schltr.) Garay - Sabah, Sulawesi
  21. Grosourdya quinquelobata(Schltr.) Garay - Sulawesi
  22. Grosourdya reflexicalcarP.O'Byrne & J.J.Verm.
  23. Grosourdya tripercus(Ames) Garay - Leyte
  24. Grosourdya urunensisJ.J.Wood, C.L.Chan & A.L.Lamb - Sabah
  25. Grosourdya vietnamica (Aver.) Kumar & S.W.Gale
  26. Grosourdya zollingeri(Rchb.f.) Rchb.f. - Java, Maluku
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<i>Micropera</i> Genus of orchids

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<i>Octarrhena</i> Genus of orchids

Octarrhena, commonly known as grub orchids, is a genus of flowering plants from the orchid family, Orchidaceae. Plants in this genus are small, orchids with short stems, thin roots, short, thick, fleshy leaves arranged in two ranks and tiny flowers. The labellum is rigidly attached to the base of the column. There are about fifty species native to areas from Sri Lanka and Malesia to the Western Pacific.

<i>Pomatocalpa</i> Genus of orchids

Pomatocalpa, commonly known as bladder orchids, or 鹿角兰属 , is a genus of about twenty five species from the orchid family, Orchidaceae. Plants in this genus are epiphytes or lithophytes with thick, leathery leaves and a large number of small flowers with a three-lobed labellum. There are about twenty five species found from tropical and subtropical Asia to the south-west Pacific.

<i>Saccolabiopsis</i> Genus of orchids

Saccolabiopsis, commonly known as pitcher orchids, is a genus of flowering plants from the orchid family, Orchidaceae. Plants in this genus are small epiphytes with short, fibrous stems, smooth, thin roots, a few thin, oblong to lance-shaped leaves in two ranks and large numbers of small green flowers on an unbranched flowering stem. There are about fifteen species found from the eastern Himalayas to the south-west Pacific.

<i>Schoenorchis</i> Genus of orchids

Schoenorchis, commonly known as flea orchids, or 匙唇兰属 in Chinese, is a genus of flowering plants from the orchid family, Orchidaceae. Plants in this genus are small epiphytes with thin roots, thin leafy stems with leaves in two ranks and tiny fragrant, almost tube-shaped flowers with a prominently spurred labellum. There are about twenty five species found from tropical and subtropical Asia to the Western Pacific.

References

  1. 1 2 3 "Trachoma". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. 1 2 3 Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 457. ISBN   1877069124.
  3. D.L.Jones; T.Hopley; S.M.Duffy (2010). "Trachoma". Australian Tropical Rainforest Orchids . Centre for Australian National Biodiversity Research (CANBR), Australian Government . Retrieved 29 May 2021.
  4. 1 2 "Genus Trachoma". Orchids of New Guinea. Retrieved 8 January 2019.
  5. 1 2 Garay, Leslie Andrew (1972). "On the systematics of the monopodial orchids". Botanical Museum Leaflets, Harvard University. 23 (4): 207. doi: 10.5962/p.168559 . S2CID   89682736 . Retrieved 8 January 2019.
  6. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 810.
  7. 1 2 Chase, M. W.; Cameron, K. M.; Freudenstein, J. F.; Pridgeon, A. M.; Salazar, G.; van den Berg, C.; Schuiteman, A. (2015). "An updated classification of Orchidaceae". Botanical Journal of the Linnean Society. 177 (2): 151–174. doi: 10.1111/boj.12234 .