Oncidium stenobulbon Kraenzl. 1922 SECTION Oblongata Photo by © Daniel Jimenez
Plant and Flowers in situ Panama Photos by © Wilfried Löderbusch
THROUGH 
Common Name or Meaning The Thin Pseudobulbed Oncidium
Flower Size 1 to 1.2" [2.5 to 3 cm]
Found in Costa Rica in deciduous forests at elevations of 800 to 1000 meters as a small sized, warm growing, caespitose epiphyte with elliptic-ovoid to suborbicular, strongly laterally compressed, furrowed when dry pseudobulbs enveloped basally by 2 to 4, imbricate, leaf-bearing sheaths and carrying 1 to 2 [3], apical, sessile to shortly petiolate, strongly carinate abaxially, elliptic to obovate, obtuse, coriaceous, conduplicate towards the base leaves that blooms in the fall and spring on a lateral, erect to arcuate, paniculate, longer than the leaf, 20 to 32" [50 to 80 cm] long, fractiflex, 2 to 5 flowered per branch, several to many flowered inflorescence.
This species is often cited as a synonym of Oncidium ansiferum but it differs from O stenobulbum in having yellow green color pseudobulbs, shorter leaves that also are much squatter or shorter, less hatchet shaped column wings and most notably spotted tepals and also is found most often around 1350 meters. So we follow Atwood and Retana here and keep them separate.
Synonyms Oncidium naranjense Schltr. 1923
References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 drawing ok; Repert. Sp. Nov. Regni. Veg. Beih. 19: 259. Costa Rica Schlechter 1923 as O naranjense; Icones Planetarum Tropicarum Plate 372 Dodson 1980; Fieldiana Botany Flora Costaricensis Family #39 Orchidaceae Atwood & Retana 1999 drawing fide; Native Ecuadorian Orchids Vol 2 Dodson 2002; Oncidium Vol 1 Koniger 2004 as O ansiferum; Manual de Plantas de Costa Rica Vol 3 Hammel, Grayum, Herrera and Zamora 2003;Icones Orchidacearum 9 Plate 903 Hagsater 2007
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