Oncidium polyadenium Lindl. 1855 SECTION Excavata

Photo by The Image Flora Website


Common Name The Many Glanded Oncidium

Flower Size 1" [2.5 cm]

Found in Ecuador and Peru at elevations of 1200 to 2300 meters as a large sized, cool to cold growing epiphyte with small pseudobulbs entirely enveloped by several pairs of imbricating, conduplicate leaf bearing sheaths and carrying oblong to elliptic-oblong, acute to subacuminate leaves that blooms on a stout, pyramidically paniculate, many flowered inflorescnece with each branch being 4" [10 cm] long, fractiflex and few flowered and all adorned with several short, close, remote sheaths and small triangular, acuminate, much shorter than the ovary floral bracts

The photo certainly differs from O excavatum in the form of the column wings but I have no real drawings of O polyadenia to refer to so please use with caution.

CAUTION I have no way of truely verifying this determination so please use with caution!!!!!

Often refered to as a synonym of O excavatum, I follow Goaverts and Schweinfurth in keeping it separate.


References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922; Orchids of Peru Vol 4 Schweinfurth 1961; Oncidium Vol 1 Koniger 2004 as O excavatum; Orchid Species Culture, Odontoglossum/Oncidium Alliance Bakers 2006 as O excavatum