Epidendrum isomerum Schltr. 1906 GROUP Ramosum SUBGROUP Ramosum
Photo by © Bogarin, Used under permission of Epidendra Website CR
TYPE Drawing by © Jimenez, Hágsater & E.Santiago and The AMO Herbario Website
THROUGH 
Common Name The Equal Count Epidendrum
Flower Size .8" [2 cm]
Found in Mexico, Guatemala, Belize, Honduras, Nicaragua, Costa Rica, Panama, Colombia, Guyana and Ecuador in tropical forests at elevations around 100 to 1000 meters as a large to giant sized, hot to warm growing epiphyte with a branched stems that can reflower after elongating with evenly distributed, articulate, very narrowly lanceolate, coriaceous, acute leaves that blooms in the summer through fall on a single flowered, sessile inflorecence carrying an often not opening well, nocturnally scented flower.
Known by its hanging, epiphytic large to giant sized plant with branching stems carrying lanceolate, very narrow, fleshy, coriaceous leaves and a single flowered inflorescence arising on the short, lateral branches. Similar to E guanacastense but it has much thicker stems and carries 2 to 3 flowers.
"Epidendrum isomerum Schltr. 1906 is part of the GROUP Ramosum SUBGROUP Ramosum characterized by the monopodial, branching stems the spike-like, distichous inflorescence, and the single callus. The species is recognized by the long, hanging, branching plants, with very narrow, fleshy, coriaceous leaves up to .28" [7 mm] wide, flowering from short lateral branches with only one flower per inflorescence, the flowers green to greenish-yellow, with the floral segments very narrow." Hagaster etal 1990
Synonyms Epidendrum guayasense Schltr.1921
References W3 Tropicos, Kew Monocot list , IPNI ; *Repert. Spec. Nov. Regni Veg. 2: 132 Schlechter 1906; Repert. Spec. Nov. Regni Veg. 8: 73. Ecuador Schlechter 1921 as E guayasense; Repert. Spec. Nov. Regni Veg. Beih. Figuren-Atlas 57: 344 Schlechter 1929 as E guayasense drawing fide; The Genus Epidendrum Ames 1936; The Orchids of Panama L.O. Williams & P Allen 1946; Ceiba Vol 5 No 1 L O Williams 1956; AOS Bulletin Vol 28 No 5 1959; Bot Notiser 130 Lojtnant 1977; Die Orchideen 3 Auflage Bd 1 Sonderabdruck aus Schlechter Lieferung 9 513 - 576 Brieger, Maatsch and Senghas 1977; Icones Planetarum Tropicarum Plate 83 Dodson 1980 drawing fide; Icones Planetarum Tropicarum Plate 720 Hamer 1982 drawing fide; Selbyana Vol 10 Orchids of Central America Hamer 1988 drawing fide; Icones Orchidacearum 1 Plate 32 Hagsater 1990 drawing fide; Field Guide to the Orchids of Costa Rica and Panama Dressler 1993; Native Ecuadorian Orchids Vol 2 Dodson 2001 drawing fide; Manual de las Plantas de Costa Rica Vol 3 Hammel, Grayum, Herrera and Zamora 2003; Orquideas Nativas del Tachira Cesar Fernandez 2003 photo fide; Vanishing Beauty, Native Costa Rican Orchids Vol 1 Pupulin 2005 photo fide; Orchids of Mexico Hagsater, Soto, Salazar, Jimenez, Lopez and Dressler 2005 photo ok; Orquideas de la Serrania del Baudo Misas Urreta 2005 drawing/photo fide; Icones Orchidacearum 9 Plate 944 Hagsater 2007 see recognition section; Icones Orchidacearum 11 Plate 1200 Hagsater 2008 see recognition section; Orchids of Costa Rica Vol 3 Morales 2009 photo fide; Guia de Orquideas de Chiapas Carlos Rommel Beutelspacher Baigts 2013 photo fide; Icones Orchidacearum 14 Plate 1443 Hagsater & Santiago 2013 See recognition section; Orchids of the Department of Valle De Cauca Colombia Vol 2 Kolanowska, Hagsater etal. 2014 drawing/photo fide; Orquideas, Tesoro de Colombia Vol 2 Ortiz & Uribe 2017 Drawing/Photo fide; Orchid Genera and Species in Guatemala Archila, Szlachchetko, Chiron, Lipinska, Mystkowska and Bertolini 2018; Icones Orchidacearum 17(2) Plate 1769 Hagsater & Jimenez 2020 see recognition section
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