Alphabetical Listing - R-
| RADINOCION Ridl. 1887 |
See Aerangis |
| RAMONIA Schltr. 1923 |
See Scaphyglottis |
| RANGAERIS
(Schltr.) Summerh. 1936
SYNONYMS Leptocentrum 
| (None) A near anagram of the name Aerangis to which the species are allied.
There are about ten mostly small monopodial epiphytic or lithophytic species in this genus, distributed widely or locally in Africa. Species produce short inflorescences with typically white flowers with long spurs In 1936 Summerhayes elevated the Rangeris section of genus Aerangis to genus status. Species differ by having folded narrow leaves and a two-lobed rostellum. | ||||||
SPECIES
|
| REGNELLIA Barb.Rodr. 1877 |
See Bletia |
| RENANTHERA
Lour. 1790
SYNONYMS Nephranthera 
| (Ren.) L. renes,kidney; anthera,anther; alluding to the species kidney-shaped
pollinia.
There are about 15 large vining monopodial epiphytic or occasionally terrestrial species in the genus distributed in northeast India, China, southeast Asia, New Guinea, and the Philippines. Species produce a branched inflorescence of orange-red flowers with large lateral sepals. Species are related to genus Ascoglossum and genus Renantherella differing only in flower structure. | ||||||||
SPECIES
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| RENANTHERELLA
Ridl. 1896
| (None)
There is only one monopodial epiphytic species, R. histrionica, in this genus distributed in southeast Asia including Malaysia, Thailand and Borneo. Species produce non-resupinate flowers. | ||||||
SPECIES
|
| RESTREPIA
Kunth 1815
| (Rstp.) Named in honor of Sr. José E. Restrepo who first
investigated the geography and natural history of the Colombian Antioquian Andes.
There are about thirty epiphytic or occasionally lithophytic species in this genus distributed in Central and South America from Mexico to northern Argentina. Species produce an unusually exotic-looking single-flower inflorescence. | ||||||
SPECIES
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| RESTREPIELLA
Garay & Dunst. 1966
| (None) Named for the genus Restrepia.
There is only one epiphytic species, R. ophiocephala, in this genus distributed primarily in Mexico but is also found as far south as Costa Rica. Species flowers are varied in color. | ||||||
SPECIES
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| RHINERRHIZA
Rupp 1951
| (Rhin.) Gr. rhine,file; rhizos,root; alluding to the rough surface on the roots
There are only three epiphytic species in this genus distributed in Australia and New Guinea. Species produce an inflorescence bearing up to 50 relatively large orange to red colored flowers with a white center. Flowers open simultaneously and last only for two or three days. Species were originally placed in genus Sarcochilus but were moved to their own genus because of differences in the vegetative and flower characteristics. | ||||||||
SPECIES
|
| RHIPIDOGLOSSUM Schltr. 1918 |
See Diaphananthe |
| RHIZANTHELLA
R.S.Rogers 1928
SYNONYMS Cryptanthemis 
| (None)
Common name: "Underground Orchid" There are only two terrestrial species in the genus distributed in Australia. These are among the most fascinating species of orchids because the entire plant grows underground with only the inflorescences ever breaking the surface to allow pollination by small flies and insects. | ||||||
SPECIES
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| RHYNCHADENIA A.Rich. 1853 |
See Macradenia |
| RHYNCHANDRA Rchb.f. 1841 |
See Corymborkis |
| RHYNCHANTHERA Blume 1826 |
illegitimate later homonym See Corymborkis |
| RHYNCHOLAELIA
Schltr. 1918
| (Rhynch.) Gr. rhynchos,a beak or snout; Laelia,orchid genus;
There are only two epiphytic species in this genus distributed in lower montane forests from Mexico to Honduras. Species produce an inflorescence of large pale-green flowers with a white lip which surrounds the column. Species were moved from genus Brassavola to form genus Rhyncholaelia because they were not consistent with the vegetative and flower characteristics of the other species in the group. Regardless of the move, however, both species are still referred as members of Brassavola by some authors and for hybrid registration and AOS award purposes. The deep-fringed lip of R. digbyana is used in hybridization with Cattleya species to produces the ruffled lips in standard Brassocattleya hybrids. | ||||||||
SPECIES
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| RHYNCHOPERA Klotzsch 1841 |
See Pleurothallis |
| RHYNCHOSTELE Rchb.f. 1852 |
See Leochilus |
| RHYNCHOPHREATIA
Schltr. 1921
| (None) Gr. rhynchos,a beak or snout; Phreatia,orchid genus;
There are ten monopodial epiphytic species in this genus distributed in Australia, New Guinea, Solomon Islands, Indonesia, and New Caledonia. Species produce racemes of small and somewhat plain-looking white flowers. | ||||||
SPECIES
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| RHYNCHOSTYLIS
Blume 1825
SYNONYMS Anota 
| (Rhy.) Gr. rhynchos,a beak or snout; stylis,column; alluding to the very
broad fleshy column
of the species flowers in is genus.
Common name: "Foxtail Orchid" There are only three monopodial epiphytic species in this genus distributed from India to Borneo and the Philippines. Species produce racemes of pretty flowers that have a strong spicy fragrance. Species are closely related to Vanda differing only by their one-lobed lip and should be cultivated in the same manner except provide indirect lighting. | ||||||||
SPECIES
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| RIDLEYA (Hook.f.) Pfitzer 1900 |
Synonym of Sarcochilus, See Thrixspermum |
| RITAIA King & Pantl. 1898 |
See Ceratostylis |
| ROBIQUETIA
Gaudich. 1826
| (Rbq.) Named in honor of 17th century French chemist M. Pierre Robiquet,
who discovered caffeine and morphine.
There are about forty monopodial epiphytic species in this genus distributed throughout the Asian tropics from Sri Lanka and India to southeast Asia, New Guinea and the Pacific Islands. Species are highly variable vegetatively and in their flowers, which may be plain white to deep red, or yellow with brown markings. All flowers have long spurs. This genus was originally established by Charles Gaudichaud-Beaupré but fell out of use. The genus was reestablished by J.J. Smith in 1912 when he separated several species from genus Saccolabium. Species are most closely related to genus Malleola. | ||||||||
SPECIES
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| RODRIGOA Braas 1979 |
See Masdevallia |
| RODRIGUEZIA
Ruiz & Pav. 1794
SYNONYMS
| (Rdza.) Dedicated to the Spanish botanist and royal apothecary
Don Manuel Rodriguez.
There are about forty epiphytic species in this genus distributed in the wet cloud forests throughout tropical America with most species found in Brazil. Species often inhabit guava trees and produce racemes of white to red flowers. Photo courtesy of Hideto Yamasaki at Brazilan Orchids | ||||||||||
SPECIES
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| RODRIGUEZIELLA
Kuntze 1891
SYNONYMS
| (Rdzlla.)
There are six epiphytic species in this genus distributed in tropical South America. Species flowers are generally very fragrant. | ||||||||
SPECIES
|
| ROSSIOGLOSSUM
(Schltr.) Garay & G.C.Kenn. 1976
| (Rssgls.) Named in honor of Ross, a collector for Barker; Gr. glossa,tongue
There are six epiphytic species in this genus distributed in Central America from Mexico to Panama. The large flowers with barred red-brown bands of these species makes them popular among collectors. Species were originally classified in genus Odontoglossum. Regardless of the move, however, two species, R. grande and R. insleayi, are still referred to as members of Odontoglossum for hybrid registration and AOS award purposes. | ||||||
SPECIES
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| ROPHOSTEMON Endl. 1837 |
orthographic variant See Nervilia or Pogonia |
| ROPTROSTEMON Blume 1828 |
See Nervilia or Pogonia |
| RUDOLFIELLA
Hoehne 1944
SYNONYMS
| (Rud.)
There are about seven rare and unusual epiphytic species in this genus distributed in tropical Central and South America including Guiana, Trinidad, Venezuela, Colombia, Panama and Brazil. Most species in this genus were originally classified in genus Bifrenaria. | ||||||||
SPECIES
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