Medium sized terrestrial, epiphyte or epilith. Leaves 4?9, strap-like, to 30 cm long, to 4 cm wide, green. Flowers usually 2?5, to 8 cm wide; summer. Dorsal sepal ovate, slightly larger than laterals, white with purplish veins. Petals linear, much narrower and longer than dorsal sepal, drooping, twisted, mostly reddish-purple. Labellum helmet-shaped, yellowish with brown veins.

Philippines.

P. rothschildianum (Rchb. f.) Stein from Borneo is a medium to large terrestrial or epilith with bright green leaves, 2?4 very large flowers that are mostly white to yellow with maroon veins, dorsal sepal much broader than petals and a large, protruding, reddish, pouched labellum.

Source: Jeanes, J. (2005). Orchidaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 5. Flowering plants. Monocotyledons. The identification of garden and cultivated plants. University of New South Wales Press.