Another flower

Photo courtesy of Noble Bashor

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Common Name Cloud Forest Oncidium

Flower Size 2" [5 cm]

Oaxaca Mx., 35 klm beyond Mitla on gravel rd, epiphytic on oaks.

Found in Sinaloa, Durango, Jalisco, Michoacan, Guerrero, Morelos and Oaxaca states of Mexico and Guatemala on oak trees in oak/pine forests at elevations of 1500 to 2300 meters as a large sized, cold to cool growing epiphyte with ovoid-elliptic, laterally compressed, ancipitous pseudobulbs enveloped basally by several, imbricating dry sheaths and a few [one on each side] leaf-bearing ones and carrying two, apical, erect-spreading, leathery, linear-elliptic, acute leaves that are shortly conduplicate below into the petiole-like base that blooms in the winter on an axillary, erect or arching, few [to 10] flowered, to 20" [50 cm] long, racemose or simply loosely paniculate inflorescence arising on a newly matured pseudobulb.

CAUTION Current references add O klotzschianum as a synonym of this species but I have kept them and their synonyms separate for now.

Similar to O obrazatum but O nebulosum differs in the short isthmus of the lip, by the different callus which has 3 forward directed teeth almost equal in length, by the rounded cheek-like thickenings of the tabula of the column that is pilose dorsally and by the well developed column wings.

Synonyms Oncidium culex Königer 2008; Oncidium fulgens Schltr. 1922; Oncidium hoppii Schltr. 1924; Oncidium meliosmum Rchb.f. 1882; Oncidium microcachrys Rchb.f. ex Kraenzl. 1922; Oncidium varians Schltr. 1923

References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 drawing ok; The Orchids of Panama L.O. Williams & P Allen 1946; Encyclopedia of Cultivated Orchids Hawkes 1965; Flora Novo-Galaciana Vol 16 McVaugh 1985; The Pictoral Encyclopedia of Oncidium Zelenko 2002; Orchid Species Culture: Oncidium, Bakers 2006; Oncidium Vol 3 Koniger 2007 drawing/photo fide; ; Orchid Species of Peru Zelenko Bermudez 2009 photo fide; Orchid Genera and Species in Guatemala Archila, Szlachchetko, Chiron, Lipinska, Mystkowska and Bertolini 2018

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