Oncidium parviflorum L.O. Williams 1942 SECTION Excavata
Plant differences Photo courtesy of Daniel Jimenez
FAINT
to 
LATE
to EARLY 
Common Name The Small Flowered Oncidium
Flower Size 5/8" [1.5 cm]
Found in Costa Rica and Panama at elevations of 200 to 1000 meters as a hot to warm growing epiphyte with elliptic to ovoid, laterally compressed, longitudinally grooved and ridged, ancipitous, brown spotted pseudobulbs partially enveloped basally by several, imbricate, leaf-bearing sheaths and carrying two apical, oblong-lanceolate, thin, conduplicate and narrows below into the base leaf that blooms in the late winter and early spring on a axillary, slender, arching, paniculate, many flowered inflorescence that arises on a matured pseudobulb with many alternate branches with a decided bottle-brush look and carrying a few to several, long-lasting, faintly fragrant flowers on each branch.
This species is very similar to O dichromaticum but differs in having a yellow calus, non-erect dorsal sepal and a non lobed lip on the flower and the pseudobulbs have 4 thin leaves, two bracteous short pseudo-leaves at the bottom of the bulb and TWO large leaves on top while O dichromaticum has 5 short -permanent- leaves, two bracteous pseudo-leaves at the bottom of the bulb and THREE very characteristic leaves on top, and this plant always shows a small interruption at the top of the bulb.
References W3 Tropicos, Kew Monocot list , IPNI ; Lankester's Epidendra Website CR ; *Amer. Orchid Soc. Bull. 11(1): 33, t. 1. 1942; AOS Bulletin Vol 27 No 6 1958; Encyclopedia of Cultivated Orchids Hawkes 1965; Fieldiana Biology, Flora Costa Ricensis Family # 39 Orchidaceae, subtribes Maxillariinae and Oncidiinae Atwood & Mora 1997; Orchid Species Culture: Oncidium, Bakers 2006; Oncidium Vol 2 Koniger 2005
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