Phaius tankervilleae, commonly known as the greater swamp-orchid, swamp lily, swamp orchid, nun's-hood orchid, nun's orchid, veiled orchid, Lady Tankerville's swamp orchid, is a species of orchid native to areas from Asia to islands in the Pacific Ocean. Phaius tankervilleae is an evergreen, terrestrial herb that has cone shaped or more or less spherical pseudobulbs mostly 60β80 mm (2β3 in) long and 30β60 mm (1β2 in) wide. Between two and eight pleated linear to lance-shaped leaves 300β1,000 mm (10β40 in) long and 80β200 mm (3β8 in) wide develop from the pseudobulb.