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In Epidendrum, considered a monophyletic genus, diverse groups can be recognized by their similar vegetative and floral characteristics. The revision of one of these groups, the E. macrostachyum group, recognized by the monopodial habit, with sub-apical branching, apical, erect inflorescence, non-resupinate, fleshy flowers, and entire lip, embracing the column, pubescent at least at the base, has led to the description of several new species, including a new species from Colombia that is here described and illustrated. The species is similar to Epidendrum microrigidiflorum , but differs in the inflorescence (distichous, 6 flowered vs. racemose, 8-16 flowered), the shape (trullate vs. widely rhombic) and ornamentation of the lip (sericeous vs. minutely papillose), and the lack of calli on the disc of the lip (ecallose vs. bicallose). In addition, a key to the 41 species of the group is provided. rEsuMEn: En Epidendrum, siendo considerado un genero monofiletico, se pueden reconocer diversos grupos de especies con caracteristicas vegetativas y florales similares. La revision de uno de estos grupos, el grupo E. macrostachyum, el cual se reconoce por su habito monopodial con ramificaciones subapicales, inflorescencia apical, erecta y flores no resupinadas, carnosas con el labelo entero abrazando la columna y pubescente por lo menos en la base, ha permitido la descripcion de varias especies nuevas, entre ellas la nueva especie que se describe y se ilustra aqui. Es una especie colombiana similar a Epidendrum microrigidiflorum , sin embargo difiere por la inflorescencia (distica, 6 flores vs. racemosa, 8-16 flores), en la forma (trulado vs. anchamente rombico) y ornamentacion del labelo (densamente sericeo vs. diminutamente papiloso) y en la ausencia de callos en el disco del mismo (ecalloso vs. bicalloso). Se presenta ademas una clave de las 41 especies del grupo.

Epidendrum lasiostachyum (Orchidaceae): a new Colombian species of the Epidendrum macrostachyum group