Oncidium luteum Rolfe 1893 SECTION Rostrata
Photo by © Piotr Markiewicz and his Flickr Orchid Photo Website
Photo by Daniel Jimenez
to 
Common Name The Egg-Yellow Oncidium
Flower Size 2/5" [1 cm]
Found in Costa Rica and Panama in windy cloudforests at elevations of 650 to 1700 meters as a mini-miniature sized, warm to cool growing epiphyte with small, laterally compressed pseuobulbs completely enveloped by several pairs of conduplicate, imbricating leaf-bearing sheaths and carrying a single, apical, leathery, narrowly to broadly elliptic, acute, dorsally keeled, narrowing below into a conduplicate base leaf that blooms in the fall on 1 or 2, erect, axillary, paniculate, many fractiflex branched, 18" [45 cm] long, many flowered inflorescence.
Synonyms Oncidium cheirophoroides Kraenzl. 1922; Oncidium pittieri Schltr. 1910
References W3 Tropicos, Kew Monocot list , IPNI ; The Epidendra Website; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as Oncidium cheirophoroides drawing fide; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as O pittieri; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922; Repert. Sp. Nov. Regni. Veg. Beih. 19: 151. Costa Rica Schlechter 1923 as O pittieri; Repert. Sp. Nov. Regni. Veg. Beih. 19: 261. Costa Rica Schlechter 1923 as O pittieri; Icones Planetarum Tropicarum plate 1572 Atwood 1993 drawing fide; Fieldiana Biology, Flora Costa Ricensis Family # 39 Orchidaceae, subtribes Maxillariinae and Oncidiinae Atwood & Mora 1999 drawing fide; Manual de Plantas de Costa Rica Vol 3 Hammel, Grayum, Herrera and Zamora 2003; Orquideologia Vol. 23 No 2 2004 as O luteum; Orchid Species Culture: Oncidium, Bakers 2006; Oncidium Vol 3 Koniger 2007 Photo/drawing fide; Orchids of Costa Rica Vol 2 Morales 2009 photo fide; Lankesteriana 12[3] 2014 photo/drawing fide; Lankesteriana 19(1). 31 - 55 2019 photo fide; Vanishing Beauty, Native Costa Rican Orchids Vol 2 Lacaena to Pteroglossa Pupulin 2020 photo fide
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