Medium sized epiphyte, variable. Pseudobulbs ovoid, to 9 cm long, compressed. Leaves 2, lanceolate, to 28 cm long, to 2.5 cm wide. Flowers 10?25, to 6 cm wide, white, often with pink suffusions, labellum callus yellow; spring. Sepals and petals similar, ovate, margins wavy. Labellum obscurely 3-lobed, midlobe notched with a small apical tooth, margins wavy. Syn. O. pescatorei Lindl. & Paxt.

Colombia.

O. crispum Lindl. from Colombia is a very variable species that can only reliably be differentiated from O. nobile by the character in the above key.

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.