Oncidium concolor Hook. 1841 SECTION Concoloria Photos by © Stefan Paeffgen

Different Angle Photo courtesy ofSylvia and Cedrics Orchid Page

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Common Name The Single-Colored Oncidium

Flower Size about 2" [about 5 cm]

A small sized, cool to warm growing epiphyte found in Brazil and northern Argentina in areas frequented by short frosts in montane forests with clustered, narrowly oblong or ovoid-oblong, sulcate in time pseudobulbs carrying 2 apical, rigid, erect spreading, lanceolate-ligulate, acute leaves that blooms with an arcuate to pendant, 12" [30 cm] long, slightly fractiflex raceme with apressed, concave, pale green bracts that has loosely few to many [4 to 12 ] flowers and occurs in the spring and summer. Potting or mounting with treefern works wekk if given warm to cool temperatures, moderately bright light and good air movement. This species and Oncidium ottonis are similar and often considered the same but differ in O concolor having the 2 lamellae of the callus are of unequal height from the top to the bottom and other lip variants, but the easiest way to distinguish the two is that O ottonis always has brown spoltches on the dorsal side of the sepals and O concolor is consistently yellow to yellow green with no spotting.

Synonyms Carenidium concolor (Hook.) Baptista 2006; Cyrtochilum citrinum Hooker 1849; Oncidium normani hort. ex Pritz. 1840; Oncidium ottonis Schltr. 1914; Oncidium unguiculatum Klotsch 1846

References W3 Tropicos, Kew Monocot list , IPNI ; AOS Bulletin Vol 26 No 10 1957 drawing; Flora de Venezuela Foldats Volumen XV Part 5 1970; AOS Bulletin Vol 56 No 6 1987 drawing; Orchids of the High Mountain Atlantic Rainforest in SE Brazil Warren & Miller 1994; Australian Orchid Review Vol 66 No 2 2001 photo; AOS Bulletin Vol 71 No 7 2002 photo; AOS Bulletin Vol 74 No 11 2005 photo; Orchid Species Culture: Oncidium, Bakers 2006; Oncidium Vol 2 Koniger 2005; The Pictoral Encyclopedia of Oncidium Zelenko 2002

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