Oncidium oblongatum Lindl. 1844 SECTION Oblongata TYPE for the section
Photo by © Lourens Grobler
Photo by Weyman Bussey
to 
Common Name The Lengthened Oncidium [refers tothe long inflorescence]
Flower Size 1 1/5" [3 cm]
Found in southwestern Mexico in dry forests at elevations up to 2100 meters as uncommon, medium sized, cool to cold growing, compact, epiphytic species with ovoid to ovoid-ellipsoid, compressed pseudobulbs partially enveloped basally by 2 to 4, imbricate, leaf-bearing sheaths and carrying 2, apical, oblong-ligulate to linear-lanceolate, subcoriaceous, suberect, narrowed basally, acute to obtuse leaves that blooms with an axillary, erect, 4'8" [1.4 meter] long, short branched, many flowered panicle with showy, fragrant flowers.
Similar to O fasciculatum but O oblongatum differs in the lanceolate petals instead of oblong, the basal area of the midlobe of the lip is distinctly cordate, instead of the basal line being straight, and the rachis only produces a single branch from each node instead of 3 arising from a single node and the smaller pseudobulbs and leaves of O oblongatum.
Synonyms Oncidium brevifolium A.Rich. & Galeotti 1845;
References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 drawing fide; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as Oncidium brevifolium; Las Orquedias De El Salvador Vol 2 Hamer 1974 drawing fide/photo ok; Orquídea (Mexico City). 8(1) 1981 photo/drawing fide; Las Orquedias de El Salvador Vol 3 Hamer 1981 drawing ok; The Manual Of Cultivated Orchid Species Bechtel, Cribb & Launert 1992 drawing fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997 drawing fide/photo ok; Guatemala Y Sus Orquideas Behar & Tinschert 1998 photo fide; The Pictoral Encyclopedia of Oncidium Zelenko 2002 Orchid Species Culture: Oncidium, Bakers 2006; Oncidium Vol 3 Koniger 2007 Photo/drawing fide; Algunas Orquideas de Mexico Tomo 1 Suarez 2013 photo fide; Orchid Genera and Species in Guatemala Archila, Szlachchetko, Chiron, Lipinska, Mystkowska and Bertolini 2018
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