Oncidium macropetalum Lindl. 1841 SECTION Barbata

Photo by © Jay Pfahl

Flower closeup

Photo by © José Luis Panozo Añez

Flowering Inflorescence

Photo by © Weyman Bussey


Common Name The Large Petal Oncidium

Flower Size 1 1/4" [3.2 cm]

Found in Paraguay, Minas Gerais, Goias, Matto Grosso and Sao Paulo states of Brazil and Bolivia? in the hot lowlands and savannahs at elevations of 200 to 300 [1000] meters as a miniature sized, warm growing species from and has conical, somewhat laterally compressed, fluted pseudobulbs subtended by 1 to 2 leaf-bearing sheaths and carries 1 or 2, apical, arching, acute leaves and blooms in the winter and spring on an axillary, slender, arcuate to pendulous, 18" [40 cm] long, few to many flowered, paniculate inflorescence arising on a mature pseudobulb.

Similar to O chrysopteranthum and O culuense with their large petals but O macropetalum is distinguished by the different callus of the lip.

Supplying warm temperatures with moderate light, plenty of water while growing and less when not, as well as good air movement will ensure a happy plant.

Synonyms Alatiglossum macropetalum ( Lindl. ) Baptista 2006; Gomesa macropetala (Lindl.) M.W.Chase & N.H.Williams 2009; Oncidium juscopetalum Hoehne 1910; Oncidium macropetalum Lindl. var. micranthum G.F.J.Pabst 1977

References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 drawing good; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 drawing fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997; Orchids of The Brazilian Central Plateau Menezes 2004 photo fide; Orchid Species Culture: Oncidium, Bakers 2006; AOS Bulletin Vol 76 No 2 2007 as Alatiglossum macropetalum photo fide; Oncidium Vol 3 Koniger 2007 photo/drawing fide; AOS Bulletin Vol 80 #6 2011 photo fide; Orchids of Brazil Vol 1 Oncidinae Baptista, Harding & Neto 2011 photo fide