Oncidium nobile (Rchb.f.) M.W.Chase & N.H.Williams

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. (as Odontoglossum nobile)

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Lilianae
order      Asparagales
family       Orchidaceae
genus        Oncidium Sw.