Oncidium excavatum Lindley 1838 SECTION Excavata Photo by Jay Pfahl

to and EARLY

Common Name The Hollow Oncidium [refers to the deep pit at the base of the underside of the lip]

Flower Size 1 1/2" [3.75 cm]

This is a large sized, cool to cold growing, terrestrial species on steep embankments from Ecuador and Peru in moist montane forests at elevations of 2400 to 2800 meters with numerous, clustered, ovoid or oblong-ovoid, slightly compressed pseudobulbs enveloped basally by a few leaf-bearing sheaths and carrying 1 or 2 apical, linear to narrowly oblong, long attenuate towards the apex, subpetiolate below leaves that blooms in spring and early summer with a stout, axillary, 2 to 4' 8" [60 to 150 cm] long, erect or arcuate, laxly many flowered panicle with 8 to 12, ascending, 10 to 20 flowered branches that arises on a newly forming pseudobulb and carrying successively opening flowers.

Synonyms Oncidium aurosum Rchb.f 1854; Oncidium boissieri Kraenzl. 1922; Oncidium excavatum var. dawsonii B.S. Williams 1885; Oncidium rupestre Lindl. 1844; Oncidium skinneri Lindl. 1855; Vitekorchis excavata (Lindl.) Romowicz & Szlach. 2006

References W3 Tropicos, Kew Monocot list , IPNI ; Bonplandia Rchb.f 1854 as Oncidium aurosum; Otia Botanica Hamburgensia Rchb.f 1878 as O rupestre; AOS Bulletin Vol 27 No 9 1958 photo; Encyclopedia of Cultivated Orchids Hawkes 1965; Icones Planetarum Tropicarum plate 474 Dodson 1982 drawing ok; Icones Planetarum Tropicarum Series II Orchids of Peru Plate 0125 Dodson & Bennett 1989 drawing fide; Icones Planetarum Tropicarum Series II Orchids of Bolivia plate 0358 Dodson & Vasquez 1989 drawing fide; The Pictoral Encyclopedia of Oncidium Zelenko 2002; Native Ecuadorian Orchids Vol 4 Dodson 2003 drawing/photo ok; Orquideologia Vol. 23 No 2 2004; Oncidium VOl 1 Koniger photo/drawing; Orchid Species Culture: Oncidium, Bakers 2006; Orchid Species of Peru Zelenko Bermudez 2009 photo fide; Orquideas del Peru Freuler 2010 photo ok

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