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Oncidium pulvinatum (6)
mesquens Gold Star Critiquer/Gold Note Writer [C: 150 W: 9 N: 201] (1364)
Flower Size to almost 1" [to almost 2.5 cm]
Found in Brazil as a compact, medium sized, hot to warm growing epiphyte with compressed, suborbicular-oblong psuedobulbs carrying a single, apical, rigid, erect, oblong, acute leaf that blooms on a slender, erect or arching, flexuous, 5 to 8' [150 to 240 cm] long, loosely paniculate, many flowered inflorescence with linear-triangular, very acute floral bracts occuring in the summer and fall. Cited as a synonym of Oncidium divaricatum but there are many discrepancies so I leave them as separate species.
Synonyms Aurinocidium pulvinatum ( Lindl. ) Romowicz & Szlach. 2006; Grandiphyllum pulvinatum ( Lindl. ) Docha Neto 2006; Oncidium sciurus Scheidw. 1839
References W3 Tropicos, Kew Monocot list , IPNI ; Orchids of the High Mountain Atlantic Rainforest in SE Brazil Warren & Miller 1994; Orchid Species Culture: Oncidium, Bakers 2006; The Pictoral Encyclopedia of Oncidium Zelenko 2002
www.orchidspecies.com/oncpulvinatum.htm
See a closer view from flowers in WS.

Altered Image #1

mesquens Gold Star Critiquer/Gold Note Writer [C: 150 W: 9 N: 201] (1364)
Macro
Edited by:mesquens Gold Star Critiquer/Gold Note Writer [C: 150 W: 9 N: 201] (1364)

A closer view from the flowers fom Oncidium pulvinatum.