Vanda sumatrana Schltr. 1911 Photo courtesy of Nik Fahmi and his Vortex Orchid Page.
Common Name The Sumatran Vanda
Flower Size 2.4" [6cm]
Found in Sumatra at elevations of 300 to 1000 meters as a large to giant sized, hot to warm growing monopodial epiphyte or lithophyte on rock faces with an elongate, erect to pendant stem carrying many, strap-shaped, curved, obliquely bilobed apically and irregularly toothed leaves that blooms in the spring on an axillary, 5.4" [13.5 cm] long, few  flowered inflorescence carrying flowers that smell of creosote.
Very similar to V helvola but differs in being a larger plant with longer inflorescence and larger flowers
References W3 Tropicos, Kew Monocot list , IPNI ; Encyclopedia of Cultivated Orchids Hawkes 1965 Orchid Digest Vol 46 No 6 1982 photo fide; Die Orchideen lieferung 19/20 Schlechter/Brieger 1988; Vandas Motes 1997 photo fide; Orchids of Sumatra Comber 2002 photos good