Osmoglossum dubium Rosillo 1983 TYPE Photo by © S.Rosillo The AMO Herbaria Website

Another Flower Photo by Gustavo Anceps and his Flickr Orchid Photo Websote.


Common Name The Dubious Osmoglossum

Flower Size .6 to .7" [1.5 to 1.8 cm]

Found in southwestern Mexico in Jalisco, Guerrero and Michoacan at elevations of 1500 to 2200 meters as a medium sized, cool to cold growing epiphyte or lithophyte with closely spaced, clump forming, slender, broader at the base, tapering towards the apex, somewhat laterally compressed, ancipitous pseudobulbs enveloped partially at the base by several, distichous, imbricating, somewhat triangular, acute, thin, uppermost leafbearing sheaths carrying 2 erect, to somewhat arching, leathery, linear to strap-shaped, acute, flat becoming conduplicate towards the base leaves that blooms in the mid winter and spring on a stiff, suberect, basal, along the axils of the sheaths, laterally compressed, to 8" [20 cm] long, rachis to 3" [7.5 cm] long, racemose, to 7 flowered inflorescence.

O. dubium may be recognized by the totally free lateral sepals which distinguishes it from O. egertonii. and O. convallarioides in which the sepals are united for at least half its length. From O. pu1lchellum, its closest ally, it may be distinguished by the smaller and rounder flowers, the sub-pentagonal to sub-elliptic lip which is some times narrowed near the base and the slightly acute sepals, 1 cm or less long, O. pu1lchellum has more acute, elongate segments, acuminate sepals and a panduriform lip, and the acute sepals more than 1 cm long.

Synonyms Cuitlauzina dubia (S.Rosillo) Yañez & Soto Arenas ex Solano 2011

References W3 Tropicos, Kew Monocot list , IPNI ; *ORQUIDEA (Méx.) 9(1): 85 Rosillo 1983 drawing/photo fide; Orchid Species Culture Oncidium/Odontoglossum Alliance Bakers 2006;