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.

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; Flora de Venezuela Foldats Volumen XV Part 5 1970 as O orthostates drawing fide; 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; Venezuela; Paraiso de Orquideas Romero 1997 photo fide; Rudolf Schlechter Die Orchideen Lieferung 33-6 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 Photo as Coppensia orthostates; 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;

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