Oncidium bifolium Sims 1812 SECTION Synsepala Photo by © Dalton Holland Baptista © Photo by Martin Batiti and Orchidstudium

Another Flower? Photo by © Dario Melgar

Common Name The Two-Leaf Oncidium

Flower Size 3/4" to 1" [2 to 2.5 cm]

Found in Bolivia, Parana, Santa Catarina and Rio Grande do Sul States of Brazil, Uruguay and Argentina in hot lowlands along shady streams, to cooler montane forests at elevations of 100 to 1300 meters as a small sized, cool growing epiphyte with ovoid or ovoid-oblong, deeply sulcate with age pseudobulbs carrying 1 or rarely 2 apical, slightly coriaceous, linear-oblong, acute leaves that blooms in the spring and fall on an axillary, often nodding, 9 to 12" [20 to 35 cm] long, few to several [5 to 20] flowered, racemose or rarely paniculate inflorescence with rigid, narrowly triangular, acute floral bracts occuring in the late winter and early spring.

Grow in a pot in cool temperatures, with moderate shade, high humidity and a lessening of water in the winter.

Synonyms Ampliglossum bifolium (Sims) Campacci 2006; Coppensia bifolia [Sims] Dumort. 1835; Gomesa bifolia (Sims) M.W.Chase & N.H.Williams 2009; Gomesa chrysothyrsus (Rchb.f. ex R.Warner) M.W.Chase & N.H.Williams 2009; Oncidium batemanianum Griseb 1879; Oncidium beyrodtianum Schltr 1910; Oncidium bifolium var. majus hort. ex B.S. Williams; Oncidium celsianum A.Rich 1844; Oncidium celsissimum Hoffmanns. 1844; Oncidium chrysothyrsus Rchb.f. ex R.Warner 1865; Oncidium martianum var bicolor Lindl. 1837

References W3 Tropicos, Kew Monocot list , IPNI ; Die Orchideen Schlechter 1915; Atlas des Orchidees Cultivees Constantin 1920 drawing ok; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as O chrysothyrsus drawing ok; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 as O celsianum; Encyclopedia of Cultivated Orchids Hawkes 1965; AOS Bulletin Vol 36 #9 1967 as O bicolor; AOS Bulletin Vol 37 No 1 1968 photo fide; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 as O chrysothyrsus drawing good; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 drawing fide; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 as O maculosum drawing hmm; Orchid Digest Vol 44 no 2 1980 photo ok as O chrysothyrsus; The Manual Of Cultivated Orchid Species Bechtel, Cribb & Launert 1992 photo fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997 photo hmm; The Pictoral Encyclopedia of Oncidium Zelenko 2002; Oncidium Vol 1 Koniger 2004 photo/drawing ok; Orchids of The Brazilian Central Plateau Menezes 2004 photo fide; 100 Orquideas Argentinas Freuler 2005 photo ok; Orchid Species Culture: Oncidium, Bakers 2006; AOS Bulletin Vol 76 No 8 2007 as Coppensia bifolia Photo fide; Orchids of Brazil Vol 1 Oncidinae Baptista, Harding & Neto 2011 as Coppensia bifolia photo fide

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