Sobralia panamensis Schltr. 1922 Photo by © , Alex K. The Green Man and hisFlickr Orchid Photo Website
Another Flower Photos courtesy of Fritz Hamer Copyright © , and the Dr Leslie Garay Archives
LATE 
Common Name The Panamanian Sobralia
Flower Size 4" [10 cm]
Found in Panama at elevations of 400 to 600 meters in lower montane forests as a large sized, hot to warm growing, erect or ascending, epiphytic or terrestrial orchid with a simple to branching, lepidote to furfurescent stem carrying elliptic to broadly elliptic-lanceolate acuminate leaves that are slightly furfurescent towards the base on the back and with densly pubescent leaf sheaths below that blooms on a short, terminal single flowered inflorescence with white to purple, fragrant flowers.
Sometimes cited as a synonym of Sobralia decora but I will leave them separate for now pending more information. Appears to me that it is a more concolor flower and does not have a central ridge to the lip apex.
Synonyms
References W3 Tropicos, Kew Monocot list , IPNI ; *Repert. Sp. Nov. Regni. Veg. Beih. 17: 11. Panama Schlechter 1922; The Orchids of Panama L.O. Williams & P Allen 1946 drawing good; Encyclopedia of Cultivated Orchids Hawkes 1965; Die Orchideen lieferung #13 753 - 816 Bulbophyllinae Brieger 1983 drawing ok;
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