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Epidendrum flexuosum
''Epidendrum flexuosum'', a reed-stemmed ''Epidendrum'' common at mid-altitudes in Central America, is a species of orchid commonly called ''Epidendrum imatophyllum''. It grows exposed to intense sunlight in the forest canopy,〔 as ''Epidendrum imatophyllum'' in Stefan Laube and Gerhard Zotz: "Neither Host-specific nor Random: Vascular Epiphytes on Three Tree Species in a Panamanian Lowland Forest" ''Annals of Botany'' 97: 1103-1114, 2006, downloaded Oct 21, 2010 from http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2803392/pdf/mcl067.pdf〕 particularly on ''Guava'' species. ''E. flexuosum'' bears non-resupinate lavender flowers on a congested raceme at the end of a long peduncle.
In the wild, ''Epidendrum flexuosum'' grows naturally together with a nest of ants,〔Alec M. Pridgeon, ''The Illustrated encyclopedia of orchids'' p. 121, Timber Press, 1992 -- as ''Epidendrum imatophyllum'' Lindley〕 and sometimes bees, wasps, or hornets,〔(The super-nettles. A dermatologist's guide to ants-in-the-plants ) in BoDD – Botanical Dermatology Database -- as ''Epidendrum imatophyllum'' Lindley〕 which protect it from predators. This species is very difficult to grow without the ants, a phenomenon found in other genera such as ''Caularthron'', ''Coryanthes'', and ''Sievekingia''.
== Description ==
''Epidendrum flexuosum'' has been placed in the subgenus ''E''. subg. Amphiglottium〔as ''E. imatophyllum'' with the notation "? ''Epidendrum flexuosum'' Meyer Fl. Essequeb. p. 260. LO. n. 34." H. G. Reichenbach "Orchides" nr. 277, C. Müller, Ed. ''Walpers. Annales Botanices Systematicae'' 6(1861) p. 391. Berlin.〕 and shares the characteristics of that subgenus: it exhibits a sympodial growth habit with slender, unswollen stems covered by close distichous sheathes which are foliaceous on the upper sections of the stem; the inflorescence is terminal and covered from its base by distichous sheathes; and the lip is adnate to the column to its apex. The ligulate leaves have a small notch in the obtuse end.〔J. Lindley, "Epidendrum imatophyllum", pp. 106—107, #52. ''The Genera and Species of Orchidaceous Plants.'' Ridgeway, London. (1830-1840)〕 The stem, including the peduncle, is flattened.〔C. Dodson & D. Bennett, "EPIDENDRUM IMATOPHYLLUM Lindl.", plate 0063 of ''Icones Plantarum Tropicarum, Series II: Orchids of Peru'. Missouri Botanical Garden, St. Louis. 1989〕 As is typical of the section ''E''. sect. ''Schistochila'', the inflorescence is a raceme, and the lip is lacerate. The lilac flowers are non-resupinate. The dorsal sepal is lanceolate and recurved, the lateral sepals are falcate, and the petals are rhombic〔J. Lindley, "Epidendrum ? fexuosum", p. 103, #34. ''The Genera and Species of Orchidaceous Plants.'' Ridgeway, London. (1830-1840)〕 with lightly fringed to irregular margins. As is typical of the subsection ''E''. subsect. ''Carinata'', the lip is trilobate and has a keel, or carina, running down the center. In the case of ''E. flexuosum'' the lip is almost oval-shaped: Dodson & Bennett 1989 use the phrase "lip obscurely 3-lobed." The column is slightly s-shaped.
The chromosome number of an individual collected in Mamirauá, Brazil has been determined as 2n = 28〔Fábio Pinheiro, Samantha Koehler, Andréa Macêdo Corrêa, Maria Luiza Faria Salatino, Antonio Salatino & Fábio de Barros. "Phylogenetic relationships and infrageneric classification of ''Epidendrum'' subgenus ''Amphiglottium'' (Laeliinae, Orchidaceae)", ''Plant Systematics and Evolution'' published online 25 September 2009. Springer Wien. http://www.springerlink.com/content/k70111rh6ww5437l/〕
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