Epidendrum

''Epidendrum'' , abbreviated Epi in the horticultural trade, is a large neotropical genus of the orchid family. With more than 1,500 species, some authors describe it as a mega-genus. The genus name (from Greek ''επί, epi'' and ''δένδρον, dendron'', "upon trees") refers to its epiphytic growth habit.

When Carl Linnaeus named this genus in 1763, he included in this genus all the epiphytic orchids known to him. Although few of these orchids are still included in the genus ''Epidendrum'', some species of ''Epidendrum'' are nevertheless not epiphytic.

Distribution and ecology

They are native to the tropics and subtropical regions of the American continents, from North Carolina to Argentina. Their habitat can be epiphytic, terrestrial (such as '' E. fulgens''), or even lithophytic (growing on bare rock, such as '' E. calanthum'' and '' E. saxatile''). Many are grown in the Andes, at altitudes between 1,000 and 3,000 m. Their habitats include humid jungles, dry tropical forests, sunny grassy slopes, cool cloud forests, and sandy barrier islands.

Members of this genus can be very aggressive colonisers of disturbed habitat, and many species which were once rare in this genus have become more common as the result of human activities. For example, some of these plants can be found in greater abundance growing terrestrially along road cuts throughout their native ranges as the result of road construction.The Orchids, Natural History and Classification, Robert L. Dressler. Illustrated Encyclopedia of Orchids

Many of these species are relatively easy to grow in rich humus compost with some sand. The plants resemble Dendrobiums in form and habit typically, although they tend to be terrestrial rather than lithophytic and epiphytic, and do better in a humus rich, well aerated substrate.

Most of the high altitude members of this genus from cloud forests defy cultivation outside their habitat, and it is reported that even moving a plant from one location to another on the same host tree in habitat will result in the death of the plant, possibly due to dependency on a specific mycorrhizal fungal symbiont.

Characteristics

They are quite varied in flower size and appearance. They grow in tufts, in racemose inflorescences, sometimes in corymbs or panicles. The apical, lateral or basal flowers are mostly small to medium in size and frequently are not marked by a conspicuous display. The inflorescences are frequently dense. Many species are fragrant. The flowers may be produced only once, or during several years from the same or new inflorescences. The ellipsoid fruits are 3-ribbed capsules.

This genus has the following characteristics:

* a slit rostellum (small extension or little beak to the median stigma lobe), producing a transparent or white thick and adhesive liquid.
* the sometimes fringed lip is adnate to ( = united with) the column (forming a nectary tube (but rarely producing nectar), continuing through the pedicel). The genus ''Prosthechea'' was split off because the lip is not completely adnate to the apex of the column.
* the pollinarium contains four pollinia, sometimes two and rarely eight pollinia, and then four very reduced.
* the erect, pendent, or creeping stems are reed-like, simple or branching, or may be pseudobulbs or thickened stems. (The genus ''Coilostylis'', recently split off from ''Epidendrum'', has pseudobulbs, is an artificial genus and does not stand up to molecular analysis)

Synonymy

Initially, European taxonomists applied the generic epithet ''Epidendrum'' to all newly discovered epiphytic orchids. Gradually, many of these "''Epidendrums''" were recognized as being quite diverse and deserving of different generic epithets—many belong to different tribes or subtribes (e.g. ''Vanda''). To add to the confusion, however, many descriptions of closely related species were published with different generic epithets.

As if the confusion caused by these publications were not great enough, many closely related genera (or perhaps subgenera, sections, or subsections) have been recognized and published. According to the modern rules of taxonomy, each new proposed genus that is split off from ''Epidendrum'' must bear the name of the oldest generic epithet published for a member of the new genus. Hence, many genera which have been brought into synonymy with ''Epidendrum'' have later been segregated out again. Because most of these decisions rest on the informed opinions of authorities, the segregated taxa are often then re-published as synonyms. Hence, some of the following information may seem a bit contradictory, especially if the assertion that two names are "synonyms" is misconstrued as an assertion that the two names mean exactly the same thing.

The following genera have been brought into synonymy with ''Epidendrum'':

* ''Amphiglottis'' Salisb.
* ''Auliza'' Small
* ''Coilostylis'' Raf.
* ''Didothion'' Raf.
* ''Diothonea'' Lindl.
* ''Dothilophis'' Raf.
* ''Doxosma'' Raf.
* ''Epicladium'' Small
* ''Epidanthus'' L.O.Williams
* ''Epidendropsis'' Garay & Dunst.
* ''Exophya'' Raf.
* ''Hemiscleria'' Lindl.
* ''Kalopternix'' Garay & Dunst.
* ''Lanium'' (Lindl.) Benth.
* ''Larnandra'' Raf.
* ''Microepidendrum'' Brieger (nom. inval.)
* ''Minicolumna'' Brieger (nom. inval.)
* ''Nanodes'' Lindl.
* ''Neolehmannia'' Kraenzl.
* ''Neowilliamsia'' Garay
* ''Nyctosma'' Raf.
* ''Phadrosanthus'' Neck. ex Raf.
* ''Physinga'' Lindl.
* ''Pleuranthium'' Benth.
* ''Pseudepidendrum'' Rchb.f.
* ''Psilanthemum'' Klotzsch ex Stein (1892)
* ''Seraphyta'' Fisch. & C.A.Mey.
* ''Spathiger'' Small
* ''Stenoglossum'' Kunth
* ''Tritelandra'' Raf..

Genera which have been erected (or resurrected) from ''Epidendrum'' include the following examples:

* ''Anacheilium'' (Lindl.) Withner & P.A.Harding (2004). This genus contains more than 50 species, reclassified from ''Prosthechea'', ''Encyclia'', and ''Epidendrum''.
* ''Barkeria''
* '' Dimerandra''
* ''Caularthron''
* ''Coilostylis'' ( Raf.)Withner & Harding
* ''Encyclia'' This is another "mega-genus" differing from ''Epidendrum'' in that the plants are mostly pseudobulbous, and in that the lip "encircles" the column, rather than being adnate. Like ''Epidendrum'', genera have been and are likely to continue to be split off from this genus.
*''Euchile'' (Dressler & G.E. Pollard) C.L. Withner (1998) was elevated from a section of ''Encyclia'' with two species.
* ''Hormidium'' Lindl. ex Heynh, described by Brieger as having the lip adnate to the proximal part of the column. Brieger placed more than 100 species in this genus. ( Lindley was unsure if this was a genus, subgenus, or section.) Withner and Harding recently transferred two more species into this genus: one from ''Epidendrum'' and one from ''Encyclia''.
* '' Microepidendrum'' Brieger ex W.E.Higgins (2002)
* ''Nanodes''
* '' Oerstedella'' Rchb.f.
* '' Oestlundia'' W.E.Higgins (2002)
* '' Panarica'' Withner & P.A.Harding (2004) contains six species, some from ''Prosthechea'' and some from ''Epidendrum''
* ''Pollardia'' Withner & P.A.Harding (2004) contains seventeen species, some from ''Prosthechea'' and some from ''Epidendrum''.
* ''Prosthechea'' This debatable genus contains the "cockleshell orchids", with lips which are adnate to the column only about halfway to the apex, and which "encircle" the end of the column. Most of the species of this genus were long classified in ''Encyclia''. Some species of this genus have been placed in ''Anacheilium'' (Lindl.) Withner & P.A.Harding (2004) and '' Panarica'' Withner & P.A.Harding (2004).
* '' Pseudencyclia'' Chiron & V.P.Castro (2003)
* '' Psychilis''

Subgenera

* ''Epidendrum'' subg. ''Amphiglottium''
* ''Epidendrum'' subg. ''Aulizeum''
* ''Epidendrum'' subg. ''Epidendrum''
* ''Epidendrum'' subg. ''Hormidium''
* ''Epidendrum'' subg. ''Pleuranthium''
* ''Epidendrum'' subg. ''Spathium''

Species

: ''See List of ''Epidendrum'' species for a full list''

''Epidendrum'' ''sensu lato'' is a huge genus, embracing more than 2,000 binomials (about 1,100 accepted names and the rest have become synonyms of other species). More than 1,000 have been split off into new or resurrected genera. However, it is estimated that there are more than 2,000 ''Epidendrum'' orchids, many of which still have to be discovered. More than 400 new species have lately been described by Eric Hágsater and colleagues (see: Reference).

Several botanists have been honored with an ''Epidendrum'' orchid named after them, including the following:
* '' E. carnevalii'' Hágsater & L.Sánchez, (1999). (named after Carnevali)
* '' E. dunstervilleorum'' Foldats, (1967). (named after G.C.K. and E. Dunsterville, husband and wife)
* '' E. foldatsii'' Hágsater & Carnevali, (1993). (named after Foldats)
* '' E. garayi'' Løjtnant, (1977). (named after Garay)
* '' E. garciae'' Pabst, (1976). (named after Garcia-Cruz)
* '' E. hagsateri'' Christenson, (1995). (named after Hágsater)
* '' E. lueri'' Dodson & Hágsater, (1989). (was named after Dr. Luer of the Missouri Botanical Gardens, author of the series of monographs about the Pleurothallidinae orchids, the ''Icones Pleurothallidinarum'')
* '' E. schlechterianum'' Ames, (1924). (named after Rudolf Schlechter)
* '' E. schweinfurthianum'' Correll, (1947). (named after Schweinfurth)

Hybrids

Only a few natural hybrids within the genus have been named as species, such as ''Epidendrum × doroteae'', ''Epidendrum × gransabanense'' and ''Epidendrum × purpureum''.

''Epidendrum'' orchids hybridize readily with members of other related genera, such as ''Cattleya'' ( × ''Epicattleya'' is the accepted nothogenus for such a hybrid) ''Brassavola'' (producing a × ''Brassoepidendrum''). There are also multi-generic hybrids, for example, × ''Vaughnara'' is the nothogenus for hybrids containing ancestor species from each of the genera ''Brassavola'', ''Cattleya'', and ''Epidendrum'', but no others.

Hybridization is thought to have a strong influence in diversification of this genus sometimes compromising the genetic integrity of the parental species.

Culture

The flowers of many ''Epidendrum'' species are small, but some such as '' E. ibaguense'' are showy, and many are widely cultivated, such as '' E. cinnabarinum'', '' E. ibaguense'', '' E. nocturnum'', '' E. radicans'', '' E. secundum'', and a multitude of hybrids of these species.

Most ''Epidendrum'' species require cool or intermediate to warm conditions for culture, and the commonly cultivated species, such as '' E. radicans'' grow in typically cool conditions. Some, such as '' E. magnoliae'' (syn. ''E. conopseum'') can even tolerate extended freezing conditions. In Auckland and other sub-tropical regions of New Zealand, the cool growing plants will flower all year round. While they are normally grown in pots, it is also possible to grow them in a bark garden or on a tree, although the plants prefer a humus rich well-aerated media.

Gallery

Image:EpidMagnoliae30Jun03.jpg, Wild '' E. magnoliae (syn. conopseum)'', Gadsden Co. FL.
Image:Epidendrum apaganoides.jpg, '' E. apaganoides''
Image:Epidendrum ciliare0.jpg, '' Coilostylis (E.) ciliaris''
Image:Epidendrum embreci - Atlanta Botanical Garden.JPG, '' E. embreci''
Image:Epidendrum porpax.jpg, '' Nanodes (E.) porpax''
Image:Tziscao-TenamPuente 016.jpg, '' E. radicans'' in the wild; Tziscao, Chiapas, Mexico.
Image:episecwayqecha.jpg, '' E. secundum'' in the montane forest of Cusco, southeastern Peru.

References

* Brieger, F. C. and Hunt, P. F. "''HORMIDIUM'', ''MAXILLARIA'' AND '' SCAPHYGLOTTIS'' (ORCH.)", ''Taxon'' 18(5) pp. 601–603 (Oct. 1969)
* Hagsater, E., and Soto, M. 2005. Epidendrum In Pridgeon, A. M., Cribb, P. J., Chase, M. W., and Rasmussen, F. N., (eds.) Genera Orchidacearum 4: Epidendroideae (Part One). Oxford University Press, pp. 236–251.
*Hagsater, E, and Sánchez S., L. 2006. The Genus Epidendrum, Part 5, Species New &O ld in Epidendrum, Icones Orchidacearum 8: pl. 801-900.
* Hagsater, E., and Sánchez S., L. 2007. The Genus Epidendrum, Part 6, Species New and Old in Epidendrum, Icones Orchidacearum 9: pl. 901-1000.
* Hagsater, E., and Sánchez S., L. 2008. The Genus Epidendrum, Part 7, Species New and Old in Epidendrum, Icones Orchidacearum 11: pl. 1101-1200.
* Hagsater, E., and Sánchez S., L. 2009. The Genus Epidendrum Part 8, Species New & Old in Epidendrum, Icones Orchidacearum 12: pl. 1201-1300.
* Hagsater E., and Sánchez S., L. 2010. The Genus Epidendrum, Part 9, Species New and Old in Epidendrum, Icones Orchidacearum 13: pl.1301-1400.
* Hagsater, E., and Sánchez S., L., 2013. The Genus Epidendrum, Part 10, Species New and Old in Epidendrum, Icones Orchidacearum 14: pl. 1401-1500.
* Hagsater, E., and Sánchez S., L., 2015. The Eenus Epidendrum, Part 11, Species New and Old in Epidendrum, Icones Orchidccearum 5(1): pl. 1501-1568.
* Hagsater, E., and Sánchez S., L. 2016. The Genus Epidendrum, Part 11, Species New and Old in Epidendrum, Icones Orchidacearum 15(2): pl. 1569-1600.
* Hagsater, E., Sanchez Saldana, L., and Garcia Cruz, J. (eds.) 1999. Icones Orchidacearum: fascicle 3. The genus Epidendrum: part 2. "A second century of new species in Epidendrum". Herbario AMO, Mexico D.F.
* Hagsater, E., Santiago Ayala, S., and Rodríguez-Martínez, L. 2016. Epidendrum lasiostachyum (Orchidaceae):A New Colombian Species of The Epidendrum Macrostschyum Group. Lankesteriana 16(1): 27-37
* Hagsater, E. 2001. Icones Orchidacearum: Fascicle 4. The Genus Epidendrum. Part 3, "A Third Century of New Species in Epidendrum". Asociacion Mexicana de Orquideologia A.C., Mexico, D.F.
* Hágsater, E. 2004. The genus Epidendrum. Part 4. A fourth century of new species in Epidendrum. Icon. Orchid. 7: pl. 701-800.
* Withner, C. A., ''Cattleyas and Their Relatives. Brassavola, Encyclia, and Other Genera of Mexico and Central America'' (5) Timber Press, 1998
* Withner, C. A. and Harding, P. A., ''Cattleyas and Their Relatives. The Debatable Epidendrums'' Timber Press 2004.

External links

*

Reed-stem ''Epidendrum''s

{{Taxonbar, from=Q133728

Epiphytic orchids
Laeliinae genera
Taxa named by Carl Linnaeus