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Odontoglossum williamsianum is an orchid species identified by Rchb.f. in 1881. Culture information and photos for this orchid are commonly detailed under the currently accepted name of Rossioglossum williamsianum.
ORIGIN: A medium to large sized, warm to cold growing epiphyte found on trees in dense forests at elevations up to 1000 meters.
DESCRIPTION: A medium to large sized, warm to cold growing epiphyte found on trees in dense forests at elevations up to 1000 meters with oblong-ellipsoid, laterally compressed, ancipitous pseudobulbs enveloped basally by 2 or more, large sheaths and carrying 1 to 2 apical, arching, elliptic, coriaceous, subacute or obtuse, shortly grooved petiolate leaves that blooms on an axillary, erect, to 12 [30 cm] long, several [to 8] flowered inflorescence arising on a recently matured pseudobulb along the axil of a basal sheath with spathaceous, subacuminate bracts occurring in the spring and summer and is a rare find in Mexico, Guatemala and Honduras.
FLOWER SIZE: To 6 inches [to 15 cm]
-- information provided by Jay Pfahl, author of the
Internet Orchid Species Encyclopedia (IOSPE).
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