Bulbophyllum grandiflorum

Bulbophyllum grandiflorum is found in Sumatra, Sulawesi, the Moluccas, and New Guinea at elevations of 100 to 800 meters in primary rainforests on the lower trunks of large trees as a hot growing epiphyte that blooms on a basal, erect to arching, to 25 cm long, single flowered, green inflorescence with foul smelling flowers that is longer than the leaves and occurs in the fall.

Very similar to Bulbophyllum burfordiense but it differs in a ciliate labellum, triangular petals, free, acute to obtuse lateral sepals, and a smaller dorsal sepal, while the other has a glaborous labellum, ovate petals that are apically acute, tapering lateral sepals with the apex acuminate, and a larger dorsal sepal of at least 14 cm long x 4 cm wide.