Oncidium onustum Lindley 1833 SECTION Onustum
Photo by Dalton Holland Baptista
Photo courtesy of Jay Pfahl
Photo courtesy of Dale and Deni Borders
Drawing by © Willibald Koniger
to 
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Common Name The Luxurious Oncidium
Flower Size 3/4" [2 cm]
Found in Panama, Colombia, Guayas, Manabi and Loja provinces of Ecuador and Piura departemnt of Peru from areas that have a long dry winter and is found at elevations of 25 to 1200 meters as a miniature sized, hot to cool growing epiphyte with small, 1" pseudobulbs are conical-ovoid, longitudinaly grooved, spaced close together on the rhizome and have a gray green appearance with purple spots, and carrying a single apical, erect, very coriaceous, 4" leaf. The racemose inflorescence is basal, and fairly lax, with few to many, longlasting, non-fragrant flowers that appear in the summer and fall.
Bright light with some shade and even waterings while in growth and then after blooming they need a decided rest with no water or fertilizer until new growth appears.
Synonyms Oncidium holochrysum Rchb. f. 1862; Zelenkoa onusta (Lindl.) M.W.Chase & N.H.Williams 2001
References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922; The Orchids of Panama L.O. Williams & P Allen 1946; AOS Bulletin Vol 28 No 8 1959 photo fide; AOS Bulletin Vol 32 No 4 1963 photo fide; AOS Bulletin Vol 35 No 5 1966 photo fide; AOS Bulletin Vol 37 #4 1968 photo fide; Orquideologia Vol 14 No 1 1979 photo; Icones Planetarum Tropicarum plate 186 Dodson 1980 drawing fide; Orchids from The Coast Of Ecuador Arosemana, Jurado, Estrada and Konanz 1988 photo fide; Icones Planetarum Tropicarum Series II Orchids of Peru Plate 0137 Dodson & Bennett 1989 drawing fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 33 - 36 2057 - 2308 Brieger 1997; Lindleyana Vol 16 No 2 2001 as Zelenkoa onustum; The Pictoral Encyclopedia of Oncidium Zelenko 2002 as Zelenkoa onusta; Native Ecuadorian Orchids Vol 4 Dodson 2003 photo fide; Orquideologia Vol. 23 No 2 2004 photo fide; Native Ecuadorian Orchids Vol 5 Dodson 2004 as Zelenkoa onusta drawing/photo fide; Orquideologia Vol. 23 No 2 2004; Oncidium Vol 1 Koniger 2004 drawing/photo fide; Orchid Species Culture: Oncidium, Bakers 2006 as Zelenkoa onusta; Orchid Species Of Peru Zelenko & Bermudez 2009 photo fide; AOS Bulletin Vol 86 #9 2017 as Zelenkoa onusta photo fide;
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