Oncidium pirarense Rchb.f. 1850 SECTION Synsepala

Photo courtesy of Botanická zahrada a arboretum Mendelova zemedelská a lesnická univerzita v Brne, Brno, Czech

Common Name The Pirara Oncidium [A town in Sao Paulo State of Brazil]

Flower Size 1" [2.5 cm]

Found southern Venezuela, Guyana and Surinam and Rondonia, Roraima, Goias, Minas Gerais and Sao Paulo states of Brazil on dry plains and savannas or on rocky outcrops in shrublands and forest margins at elevations of 350 to 1600 meters as a medium sized, hot to cool growing terrestrial, lithophyte or epiphyte with clustered, ovate to elliptical, slightly compressed laterally, ancipitous, longitudinally rugose pseudobulbs partially enveloped by 2 leaf-bearing sheaths, one small and the other large and carrying 1 to 2, erect to slightly spreading, linear-lanceolate, conduplicate below into the elongate base that blooms in the fall on an axillary, oval in cross-section, dark brown flecked with green, racemose, to 39" [to 100 cm] long, several [to 10] flowered, closely spaced inflorescence arising on a newly matured pseudobulb.

CAUTION Pabst's drawing of O pirarense is what I have as O barbaceniae and his drawing of O orthostates is what I have here O pirarense. What a mess, I need better references. See also O barbaceniae/montanum! SO PLEASE USE EITHER OF THESE DETERMINATIONS WITH EXTREME CAUTION!!!!!

Synonyms Ampliglossum orthostates (Ridl.) Campacci 2006; Ampliglossum pirarense (Rchb.f.) Campacci 2006; Coppensia orthostates (Ridl.) Campacci 2006; Coppensia pirarensis (Rchb.f.) Campacci 2006; Gomesa pirarensis (Rchb.f.) M.W.Chase & N.H.Williams 2009; Nohawilliamsia pirarensis (Rchb.f.) M.W.Chase & Whitten 2009; Oncidium orthostates Ridl. 1887

References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 drawing ok; Venezuelan Orchids Illustrated Vol 1 Dunsterville & Garay 1959 drawing as O orthostates fide; AOS Bulletin Vol 33 #8 1964 as O orthostates; Flora de Venezuela Volumen XV Part 5 Foldats 1970 as O orthostates drawing fide; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 as O orthostates drawing fide; Orchidaceae Brasilenses Band 2 Pabst & Dungs 1977 drawing not = O barbaceniae; Orchids of Venezuela, An Illustrated Field Guide Vol 2 Dunsterville & Garay 1979 as O orthostates drawing fide; AOS Bulletin Vol 62 No 7 1993 photo not = O barbacenae?; Venezuela; Paraiso de Orquideas Romero 1997 photo fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997; Orchids of Venezuela [An illustrated field guide] Vol. 2 Ramiro and Carnevali 2000 as O orthostates drawing fide; The Pictoral Encyclopedia of Oncidium Zelenko 2002; Flora of the Venezuelan Guayana Vol 7 Steyermark, Berry, Yatskievych and Holst 2003 drawing fide; Orchid Species Culture: Oncidium, Bakers 2006; AOS Bulletin Vol 76 No 8 2007 as Coppensia pirarensis; AOS Bulletin Vol 76 No 8 2007 as Coppensia orthostates; AOS Bulletin vol 78 No 9 2009 as Nohawilliamsia orthostates; photo fide; Orchid Digest Vol 73 #3 2009 photo fide; Orchids of Brazil Vol 1 Oncidinae Baptista, Harding & Neto 2011 as Neohawilliamsia pirarensis photo fide; Orquideas de Roirama Luz & Franco 2012 as Nohawilliamsia orthostates [Sic] photo fide;