Norris H. Williams

Cischweinfia is a genus of flowering plants from the orchid family, Orchidaceae. It was named after Harvard orchidologist Charles Schweinfurth. It has eleven currently recognized species, all native to Central America and northwestern South America.

Trichocentrum lanceanum is a species of orchid found from Trinidad to southern tropical America.

Phragmipedium lindenii is a species of orchid (family Orchidaceae) found from Venezuela to Ecuador. It is a lithophyte (rock dwelling plant). It is unique among orchids in being actinomorphic (radially symmetrical); the lip being indistinguishable from the other petals, and there being three stamens instead of the usual one or two stamens as in its nearest relative Phragmapedium wallisii which like all other orchids is zygomorphic (bilaterally symmetrical).

Erycina pusilla is a species of flowering plants, which is a tiny orchid with an overall size of 2.5 to 3.5 cm from the orchid family, Orchidaceae. Its species are native to Mexico, Belize, Central America, South America and Trinidad. The leaves are shaped like a lance head (lanceolate) and arranged in a fan. Unlike other similar orchids, E. pusilla never develops lengthwise folded leaves (conduplicate leaves) or extra storage organs (pseudobulbs). The blooming season is from fall to spring. It produces solitary light-yellow orchid-shaped flowers. In comparison to the overall plant size,

Zelenkoa is a genus of flowering plants from the orchid family, Orchidaceae. It contains only one known species, Zelenkoa onusta, native to Ecuador and Peru. Zelenkoa onusta is an epiphytic desert orchid, that survives in the harsh conditions of dry forests in southwestern Ecuador and northwestern Peru between sea level and 1200 meters, growing on trees and cacti. Flowers are 2.cm wide.

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Gomesa hydrophila is a species of orchid found from Brazil to Paraguay. This species is an epiphyte primarily growing in wetlands. Below ground, this orchid has pseudobulbs which store starches used to support growth. Above ground, the plant has strap-like leaves and blooms in late spring or early summer. The blooms are paniculate on stems which have many flowers. The stems may be held up by surrounding vegetation or erect. The species was first formally described in 1877 by Rodrigues in his Genera et species orchidearum novarum. In 2009, Mark Wayne Chase and Norris Hagan Williams transferred

Gomesa blanchetii is a species of orchid native to eastern and southern Brazil. Found in the cool mountains, hot and humid lowlands and inland savannahs of eastern and southeastern Brazil as a medium-sized, cool growing epiphyte that occurs at elevations of 800 to 2000 meters with clustered, erect, oblong or narrowly ovoid-oblong, compressed, smooth and then sulcate with age pseudobulbs carrying 3 apical, erect, rigid, coriaceous, narrowly linear-ligulate, acute leaves and blooms in the spring through summer on an erect, 2' to 5'4"" (60 to 160 cm) long, robust, paniculate, many flowered

Cyrtochiloides, a genus of orchids described in 2001 by Norris H. Williams and Mark W. Chase, is designed to provide a small group of Neotropical epiphytes, previously included under a broad concept of Oncidium Sw., with a new, more accurate identity based on DNA. Cyrtochiloides is akin to the mainly South American Cyrtochilum Kunth, a genus described in 1815. After having found its species scattered in Oncidium and several other genera, recently Cyrtochilum received notable acceptance by botanists, primarily based on the molecular discoveries made by Williams and Chase, as well as

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Trichocentrum splendidum is a species of orchid endemic to Guatemala.

Oncidium nobile, synonym Odontoglossum nobile, is a species of orchid endemic to Colombia. It is known as the grand odontoglossum.

Gomesa radicans is a species of plant from the orchid family, Orchidaceae. Gomesa radicans was previously classified as the only species (Ornithophora radicans) in the genus Ornithophora.

Oncidium praetextum is a species of orchid endemic to southern and southeastern Brazil.

Gomesa micropogon is a species of orchid endemic to southeastern Brazil.

Oncidium longicornu is a species of orchid occurring from Brazil to northeastern Argentina, where it is recorded from the provinces of Misiones and Corrientes. It is an epiphytic plant, with yellow flowers appearing between October and November.

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Trichocentrum luridum is a species of orchid found from Mexico through parts of Central America to northern South America (Belize, Colombia, French Guiana, Guatemala, Guyana, Honduras, Mexico, Trinidad and Tobago, and Venezuela). It was first described in 1823 by John Lindley as Oncidium luridum. It is placed in the subtribe Oncidiinae.

Trichocentrum cavendishianum is a species of orchid found in Mexico, Guatemala, El Salvador, and Honduras.

Oncidium lindleyoides is a species of flowering plant in the family Orchidaceae, native to Colombia, Ecuador and Venezuela. It was first described by Heinrich Gustav Reichenbach in 1854 as Odontoglossum lindleyanum. When transferred to Oncidium in 2008, the epithet lindleyanum could not be used because it had already been published for a different species, so the replacement name O. lindleyoides was used.

Oncidium cinnamomeum is a species of orchid endemic to northwestern Venezuela.

Miltonia phymatochila, synonym Phymatochilum brasiliense, is an orchid species native to northeast and southeast Brazil. It is an inhabitant of the Serra do Mar mountains. It vegetatively resembles Oncidium species rather than other Miltonia species and was at one time placed as the only species in the genus Phymatochilum.

Gomesa imperatoris-maximiliani is a species of orchid endemic to eastern and southern Brazil.

Gomesa echinata is a species of orchid native to Brazil (Rio de Janeiro). It was formerly within the genus Oncidium until a phylogenetic study published in 2009 transferred it and some other Oncidium species to Gomesa.

Gomesa dasytyle is a species of orchid endemic to Brazil (Rio de Janeiro). It was formerly within the genus Oncidium until a phylogenetic study published in 2009 transferred it and some other Oncidium species to Gomesa.

Gomesa croesus is a species of orchid that is endemic to Brazil (Pernambuco to Rio de Janeiro state).

Gomesa bifolia is a species of orchid found in Argentina, Bolivia, Paraguay and Uruguay. It was formerly within the genus Oncidium until a phylogenetic study published in 2009 transferred it and some other Oncidium species to Gomesa.

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Cyrtochiloides ochmatochila is a species of orchid. The genus Cyrtochiloides N.H.Williams & M.W.Chase (2001) comprises a small group of Neotropical epiphytes, previously included under a broad concept of Oncidium Sw., with a new, more accurate identity based on DNA. Cyrtochiloides is akin to the mainly South American Cyrtochilum Kunth (1815). After having found its species scattered in Oncidium and several other genera, recently Cyrtochilum received notable acceptance by botanists, primarily based on the molecular discoveries made by Williams and Chase, as well as morphological analyses