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Herbs, epiphytic or terrestrial, ± cespitose. Stems pseudobulbs, green, ovoid. Leaves persistent, 1-3, not recurved; blade conduplicate, linear-lanceolate, dorsiventrally flattened, margins entire. Inflorescences paniculate racemes, lateral branches to 10[-42] cm; bracts narrowly triangular. Flowers resupinate; sepals and petals distinct and free, oblong-elliptic, obovate to nearly quadrangular or nearly circular, apex retuse to obtuse, sometimes apiculate; lip pandurate, 3-lobed; callus prominent warty-tuberculate-fringed; column with wings, arms, or fingerlike projections; stigmatic cavity ± round; rostellum not prominent. Fruits capsules.

Species 800: tropical and subtropical, Western Hemisphere.

Oncidium is a large polymorphic, and probably paraphyletic, assemblage.[1]


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The Genus Oncidium is a member of the Family Orchidaceae. Here is the complete "parentage" of Oncidium:

The Genus Oncidium is further organized into finer groupings including:


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  1. Chase, Mark W. "Oncidium". in Flora of North America Vol. 26 Page 496, 497, 648, 649, 650, 651. Oxford University Press. Online at


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Last Revised: August 27, 2014
2014/08/27 07:20:41