Guy R. Chiron

• PhD
• Research Associate at Claude Bernard University Lyon 1

This study proposes a new natural hybrid of Catasetum from the Rio Madeira, municipality of Humaitá, in the southern part of the Brazilian state of Amazonas. It has been found in a flooded forest (Várzea). Its characters are intermediate between those of Catasetum garnettianum and Catasetum rivularium, which are the parental species, both endemic t...

The pantropical Vanilla is the most species-rich genus among Vanilloideae (Orchidaceae). With 38 species, Brazil is the center of diversity for Vanilla. Several of the Brazilian taxa are considered obscure, as species boundaries are often unclear when studies are performed exclusively on dried specimens. This is the case of Vanilla sprucei Rolfe, a...

This study describes a new natural hybrid of Catasetum, C. × vilhenense, from the State of Rondônia (Brazil) found in ombrophilous forests near the Roosevelt River. The hybrid shows intermediate morphological features between its parental species, C. ariquemense and C. multifidum, with specific differences in floral morphology and inflorescence str...

The genus Catasetum stands out by its elevated number of registered natural hybrids. Many of them have been described as new species and there is a need of revision. Thus, we propose in this study a change in the taxonomic status of Catasetum joaquinianum: we suggest it as a natural hybrid, based on the comparison of its holotype and protologue wit...

We propose in this article a new form of Galeandra styllomisantha from the District of Coração, located in the western part of Macapá, capital of the Amapá state, New form of Galeandra styllomisantha-Cantuária et al. Brazil. A detailed taxonomic description is given together with information relating to habitat, ecology and geographical distributio...

In this article we first propose to treat Dichaea integrilabia and D. saraca-taquerensis as synonyms based on analysis of the types, original descriptions and other material conserved in Amazonian herbaria. We also better address the taxonomic issues relating to D. fusca and D. weigeltii which have been wrongly considered as synonymous species. Bes...

This study presents a new orchid species of the genus Catasetum belonging to the group of species with symmetrical and parallel antennae. It was found in terra-firme and floodplain forests in the Brazilian states of Amazonas and Pará. We provide a formal description of the new species, images, and notes on distribution, habitat, phenology, flower v...

A new Catasetum species from Brazilian Amazon, more specifically from the “Floresta Nacional de Saracá-Taquera” (State of Pará), is proposed, described and illustrated. This new taxon belongs to the subgenus Catasetum, section Isoceras, subsection Isoceras, whose representatives have symmetrical and parallel antennae. It is compared with C. nhamund...

In the present study a new Catasetum species is proposed. It belongs to the Catasetum barbatum group and was found in the campina vegetation of the Reserva Biológica de Campina located in the north of Manaus, Amazonas state, Central Brazilian Amazon. A detailed description of the taxon is given as well as a photograph plate and comments on habitat,...

In this study we propose to treat Catasetum meeae and C. lendarium as conspecific based on distinctive features identified in the protologues of both species. We emphasize that C. meeae was never collected again after its description in the 1960s. Here we also invalidate the name C. lendarium because its original description is not in accordance wi...

Abstract In the present study we propose a new Catasetum taxon belonging to the group of species with symmetrical and converging antennae. It was found in a vegetation of “terra firme” and “campinarana” in the central Brazilian Amazon. A detailed description of the taxon is given as well as a photograph plate and comments relating to distribution,...

Species New & Old in Epidendrum

Hybridization is a process that can occur randomly in nature between different genetically compatible species, as is observed within the genus Catasetum. Thus, this work proposes the description of a new nothospecies found in the lake of Castanho located in the municipality of Careiro Castanho. It is described, illustrated and compared with its par...

A new species of Coryanthes, from the State of Alagoas in Brazil, is proposed. It comes from Atlantic Forest and only one plant has been studied, in the municipality of Atalaia. This find represents the first occurrence of a Coryanthes member in Alagoas. The new taxon is characterized by its smooth mesochile (i.e. it belongs to the subgenus Coryant...

In this work we present a new Catasetum species belonging to the Catasetum barbatum group and native to Brazilian Amazon, more precisely from Oriximiná in the Pará state. A complete morphological description of the taxon is provided, together with a photographic plate as well as notes on habitat, distribution and phenology. Finally, we compare the...

In this article we extend the geographic distribution of a rare Octomeria species, first described from Venezuela: Octomeria romerorum is reported for the first time from Brazil. Apart from considerably extending the distribution of the species, this record also represents the first documented collections since its description in 1990. We provide a...

Natural hybridization has often been recorded within certain genera of orchids, one of them is Catasetum. During a field study in a forest de igapó in Brazilian Amazon, a new natural hybrid was found, it is here described as Catasetum × sheyllae. Its morphological features, mainly the structures of the lip, are intermediate between those of its put...

Sur la base des protologues de l'ensemble des espèces de Coryanthes, nous proposons une organisation infragénérique du genre, en 3 sous-genres-Coryanthes, Anosmophorum et Lamellunguis-ce dernier divisé en 3 sections-Lamellunguis, Planichilus et Magnilamella-et autant de sous-sections. La répartition géographique de ces groupes ainsi que de l'ensemb...

La liste des espèces de Lepanthes présentes dans le département est mise à jour. Chaque espèce est présentée et les confusions possibles discutées. La présence de deux espèces déjà citées par différents auteurs, L. helicocephala et L. cremersii, est confirmée. A cela s'ajoute une troisième espèce, relativement commune en Guyane française mais jusqu...

Une plante de Coryanthes, collectée dans la région de Tefé, Amazonie brésilienne, membre de la section Coryanthes, à inflorescence biflore et fleurs relativement petites, est décrite au rang d'espèce. Nous en proposons une description morphologique détaillée, une planche de dessins analytiques et une photographie de la fleur. Nous la comparons ensu...

In the present article a new nothospecies is described, from the Brazilian Amazon, more precisely from the city of Careiro da Várzea in the state of Amazonas (Central Amazon). A detailed description of this natural hybrid is proposed together with a photographic plate and a few notes on the habitat, distribution, ecology and phenology. The hybrid i...

Through this work we extend the geographical distribution of Coryanthes mystax, an orchid hitherto considered as endemic to the State of Para (Brazil). We provide a brief morphological description, together with a photographic analytic plate, notes on geographical distribution, habitat, phenology and a discussion of the closest relatives. A tentati...

We first remember the knowledge history of the genus Stanhopea, since its ethnobotanical use by the Mayas and the description of the Maya Coaxtzontecoxochit (= Stanhopea hernandezii) by Francisco Hernandez in the XVI century, up to the recent book "El género Stanhopea en Guatemala y México". Then we propose a new species, found in the Guatemalan de...

The first record of Vanilla labellopapillata is presented for the state of Amazonas, Brazil, in the region of Manaus, now the western limit of the species, which was previously known only from the type locality in the state of Pará. A brief description is provided and taxonomic and ecological aspects of the species are discussed in the light of thi...

After a 30 years research on Guatemalan orchids, and 10 years after the last taxonomic treatment of the genus Chysis, the analysis of our material led us to recognize three new taxonomic entities in the genus for Guatemala. Which confirms that this country, although little collected, is not only a center of speciation for this genus but also an are...

La liste des espèces de Palmorchis présentes en Guyane est mise à jour. Dans cette étude, basée sur des caractères morphologiques discriminants, chaque espèce citée dans la région est présentée et les confusions possibles discutées. La présence de P. pabstii et P. pubescens est confirmée en Guyane, le taxon P. veyretae, décrit récemment du Guyana,...

Plusieurs populations de Selenipedium ont été découvertes dans les régions de Sinnamary, Kourou et Régina, à l'est et au sud-est de la Guyane. Une étude approfondie a montré qu'il s'agissait d'un taxon bien différent des autres espèces connues, notamment par la taille remarquable de ses fleurs. La plante est ici décrite, illustrée et comparée aux e...

Molecular phylogenetics has now provided a new approach to the taxonomy of Oncidiinae and related taxa. The concepts of numerous previously accepted genera and their interrelations have been brought into question. One of the most significant changes in the systematics of Oncidium-like orchids concern the recognition of Gomesa and its closely allied...

forest in Bahia, is proposed. Second representant of the section Lamellungis Schlechter for this biotope, Coryanthes marcaliana is described, illustrated and compared to the species belonging to the same section and presenting a similar morphology, especially Coryanthes leferenziorum G.Gerlach, Senghas & Seeger, a plant endemic to Bolivia, and Cory...

The genus Vanilla has one of the most important orchid species worldwide, however, despite its economic impact, there is still much to discover. Members of the genus are distributed in tropical zones of America, Asia and Africa but aromatic vanillas are found only in the Americas. Informally, the genus can be divided into two groups, one with tubul...

A new taxon, native to the shores of the Curiquidi pond, in the State of Amazonas, is described and illustrated. In the shape of the labellum, it is similar to Catasetum callosum and to C. transversicallosum. However, as far as the antennae are considered, C. sophiae is more similar to C. yavitaense. Placed in the section Isoceras with convergent a...

The genus Cuitlauzina is comprised of species of horticultural interest and is relatively well known. Hitherto six species have been recognized, all of them reported in Mesoamerica. Recently, new explorations in Guatemala revealed the existence of an undescribed taxon. In this article we describe it as Cuitlauzina cariasii, a striking novelty from...

________________________________ Résumé Nous proposons dans cet article une nouvelle espèce de Catasetum, appartenant à la section Isoceras, découverte récemment par le second auteur dans la région de Buerarema, Bahia, Brésil. Sa description morphologique détaillée est accompagnée d'une planche de dessins botaniques et d'une photographie. L'espèce...

Une nouvelle espèce de Coryanthes est proposée, décrite, illustrée et comparée à ses plus proches parents. Elle appartient à un groupe de plantes que l'on peut désigner sous le nom de complexe Coryanthes speciosa. Comme les deux autres espèces de ce groupe, elle est décrite sur la base de plantes originaires de Bahia, au Brésil. Abstract A new Cory...

Lepanthes is a neotropical genus within which a surprising number of species have been described in recent decades. Such a diversity is related to its ability to bloom throughout the year and to its pollination by miniature Diptera. Recently a extremely small Lepanthes was discovered in Guatemala. Its dimensions make it the smallest orchid in the w...

During a recent botanical exploration in the vicinity of the city of Jacaltenango, Guatemala, an orchid was found, with characters so different from any known plant that it was initially considered to possibly represent a new genus. The study of the morphological characters showed that it was in fact a new species belonging to the genus Gracielanth...

The name Guatemala derives from the Nahuatl word "Quauhtlemallan", and means "Land of trees". The name was given by the abundance of forest covering the country. Guatemala has a large number of ecosystems due to the diversified rainfall regime and diverse topographic relief, allowing a speed process of plant diversification, that has led to high le...

During botanical tours in Alta Verapaz (Guatemala), a plant of the genus Elleanthus drew the attention of the senior author by the color of its leaves, intense purple on their abaxial side. After having thoroughly examined it we came to the conclusion that it was something different from any known species. It is described here as a new species and...

Pour la première fois une espèce de Coryanthes de la section Lamellunguis a été observée dans la Mata Atlântica de l'état de Bahia, au Brésil. Une petite population d'environ 17 individus a été découverte dans une plantation de cacaoyers, sur une petite montagne située au sud-est d'Itajuípe. Cette espèce est décrite, illustrée et comparée aux deux...

- In this third article devoted to the revision of the Epidendrum species in French Guiana we deal with the "Pseudepidendrum" group. Our study showed that only two subgroups among the five proposed by Hágsater and his collaborators are concerned, the subgroups "Densiflorum" and "Pluriracemosum". Five species of the group have been cited by previous...

A taxonomic synopsis of Peruvian Acianthera including 35 accepted species is presented. An artificial key and maps for known localities from all these species are also included. Acianthera berlinensis and Acianthera marleniae are described and illustrated as new species based on specimens collected in the Peruvian regions of Amazonas and Cajamarca,...

Après un premier article consacré au groupe « Arbuscula », nous analysons dans cet article neuf espèces d'Epidendrum du groupe « Difforme » citées pour la Guyane par de précédents auteurs. Deux d'entre elles, Epidendrum difforme et E. latilabre, ne sont pas présents en Guyane, les spécimens initialement déterminés sous le nom du premier ayant depui...

Guatemala is a relatively small country in term of size, but its geographical and biological diversity is enormous. It is estimated that about 8,000 species of vascular plants can be found there, many of them are endemic. Its orchid richness is impressive and for many years poorly studied. It ranges from a little more than 100 species mentioned by...

Dans cette première partie de la révision des espèces d'Epidendrum de Guyane, nous nous intéressons au groupe « Arbuscula ». Trois espèces de ce groupe ont été citées, E. bakrense, E. ecostatum et E. sinnamaryense. La présence d'E. bakrense et d'E. sinnamaryense est confirmée. Celle d'E. ecostatum est improbable car le matériel associé ne correspon...

The detailed study of several Cohniella specimens observed and/or collected in French Guiana shows that they all belong to a single entity and that it is different from the two species previously cited for this country, Cohniella cebolleta and C. ultrajectina, by a set of significant vegetative and floral characters. This entity is here described a...

Les collectes de plantes terrestres appartenant à la famille Orchidaceae réalisées par le premier auteur ont permis la découverte de plusieurs espèces nouvelles. L'une d'elles est ici présentée, décrite et illustrée. Elle est comparée à son plus proche parent, Prescottia stachyodes. A new species within the genus Prescottia (Orchidaceae, Cranichidi...

Une révision du complexe « Vanilla ruiziana », appartenant à la section Vanilla sect. Xanata, est proposée. Une population de vanille découverte dans une forêt de transition sur affleurements rocheux, située sur la commune de Kourou (Guyane) est proposée comme espèce nouvelle de ce complexe, après comparaison avec les autres membres. Elle est décri...

Une petite population de Catasetum découverte dans la Caatinga bahianaise (Brésil) et appartenant au complexe Catasetum cristatum est proposée en tant que nouvelle espèce. Elle est décrite et illustrée et comparée à ses plus proches parents : Catasetum arietinum, C. blackii, C. cristatum, C. deusvandoi et C. lanciferum. En outre une variante de cou...

L'analyse morphologique comparée d'une population de Restrepia trouvée dans les montagnes de Coban, au Guatemala avec les autres espèces du genre a permis d'établir qu'il s'agissait d'une nouvelle espèce. Elle est ici décrite, illustrée et comparée avec son plus proche parent, Restrepia vasquezii. Le disque basal du gynostème semble constituer un b...

Background The generic separateness and specific composition of the orchid genus Cyrtochilum was discussed for almost two centuries. Over the years several smaller taxa were segregated from this taxon, but their separateness was recently questioned based on molecular studies outcomes. The aim of our study was to revise concepts of morphological-bas...

Different morphological characters are presented in favour of the separation of Acropera and Gongora, two genera regarded as synonyms by various authors. Two new species are proposed, one within Acropera and one within Gongora, and compared to their closest relatives. Finally four new combinations in Acropera are validated.

Abstract. A taxonomic synopsis of peruvian Acianthera is provided including twenty eight accepted species. An artificial key and maps for known localities for all species cited are included. Acianthera isabeliae is herein described as a new species based on specimen collected in Amazonas, Peru. Moreover, traits that distinguish this species from si...

The book is a monograph of all Asian conduplicate slipper orchids.

Two of us found some years ago that Phloeophila nummularia, type species of the genus Phloeophila, was placed in amolecular phylogentic study in Pabstiella. In this article, we show with the inclusion of new sequences of Phloeophila that this result was not correct. Phloeophila forms a unique clade in Pleurothallidinae and is not closely related to...

La liste des espèces de Lepanthes présentes dans le département est mise à jour. Chaque espèce est présentée et les confusions possibles discutées. La présence de deux espèces déjà citées par différents auteurs, L. helicocephala et L. cremersii, est confirmée. A cela s'ajoute une troisième espèce, relativement commune en Guyane française mais jusqu...

A new Dichaea species is described. It shows an ovate an ovate, non-clawed lip, a feature up to now never observed in the genus that separates it from all related species. The species has been observed only in the Central Amazon.

L'examen des protologues, de planches d'herbier et de la littérature secondaire relatifs à la quinzaine de noms publiés dans le complexe « Octomeria tridentata » nous amène à considérer qu'il y a dans ce groupe trois espèces bien définies – Octomeria grandiflora, Octomeria multiflora, Octomeria surinamensis – et une espèce « incertae sedis » – Octo...

Platystele imperialis, the tiniest orchid in the world – A new species of Platystele is presented, certainly the smallest orchid species hitherto known, 20% smaller than the smallest Platystele. Beyond the record however, the importance of this discovery lies in the knowledge of organisms having evolved to get small sizes which help them in the rep...

Sont proposées dans cet article six nouvelles espèces de Pleurothallidinae originaires des forêts humides de l'État d'Espírito Santo, Brésil. L'une appartient au genre Acianthera, les autres au genre Pabstiella. Parmi ces dernières l'une possède des fleurs à sépales pubescents sur leur face interne tandis que les quatre autres produisent des fleurs...

Revision of the “Dichaea graminoides” alliance (Orchidaceae) in French Guiana and around – The members of the “Dichaea graminoides” group from north-eastern South America and West Indies are revised. Our results confirm that Dichaea graminoides is not present on the continental part of this area and that D. cogniauxiana is endemic to Brazil. D. hoo...

A new species is proposed in the genus Anathallis. It is described, illustrated and compared with its relatives. A key to the Amazonian species of Anathallis is presented. We propose a new combination in the genus Lankesteriana.

Zygostates (Orchidaceae): first record for French Guiana – The genus Zygostates Lindley was observed for the first time in French Guiana. It is represented by Zygostates ligulata Toscano & Werkhoven, a species endemic to the Guiana Shield. The species is briefly described and illustrated.

Suite aux explorations botaniques menées dans les forêts tropicales du Guatemala, nous proposons une nouvelle espèce de Lycaste, décrite, illustrée et comparée à l'espèce la plus proche, Lycaste leucantha. Abstract A new Lycaste (Orchidaceae) from Central America – As a result of our botanical explorations in the tropical forests of Guatemala, we p...

L'étude des Orchidaceae d'Amérique Centrale a permis la découverte, au Guatemala, d'une nouvelle espèce de Stellilabium qui est ici décrite, illustrée et comparée à son plus proche parent, Stellilabium boylei. Une nouvelle combinaison dans le même genre est également proposée. Abstract Stellilabium auriculatum (Orchidaceae), a new species from the...

in questa prima parte si presentano le informazioni di base per una migliore com! prensione del genere Lycaste, sulla base della let! teratura pubblicata a carattere scientifico!tassonomica, dal momento in cui il genere fu proposto da Lyndley ad oggi. Viene spiegata la circoscrizione del genere Lycaste non! ché le relazioni infrageneriche di taxa c...

Mots-clés/Keywords : Jardin botanique de Guyane/Botanical Garden OGE, morphogroupe/morphogroup " Vanilla planifolia " , nouveaux taxons/new taxa, taxinomie/taxonomy. Résumé Deux vanilles originaires de régions de basses altitudes en Guyane française sont proposées en tant qu'espèces nouvelles. Elles sont décrites, illustrées et comparées à leurs pl...

L'étude de la sous-tribu Pleurothallidinae au Guatemala a permis de découvrir et de décrire de nombreuses espèces nouvelles et l'un des genres concernés par ces découvertes est Platystele Schlechter, dont une des caractéristiques est de produire, selon les espèces, des fleurs tantôt minuscules [par exemple, Platystele minimiflora (Schlechter) Garay...

L'étude approfondie des orchidées du Guatemala par la « Station expérimentale d'orchidées » du Guatemala a permis, entre autres découvertes, celle d'une nouvelle espèce de Campylocentrum, affine de Campylocentrum brenesii. Elle est ici décrite et illustrée. Abstract Campylocentrum lutheri (Orchidaceae), a new species dedicated to Harry Luther – An...

Existem cerca de 700 espécies de orquídeas na serra do Castelo (Espírito Santo), principalmente em resquícios de Mata Atlântica. Este livro tem como objetivo apresentar todas, oferecendo, para cada uma das notas taxonômicas, uma descrição morfológica e, muitas vezes, uma iconografia constituída de uma prancha botânica esquematizada e uma fotografia...

Une espèce de Dichaea, relativement commune en Guyane française mais jusqu'ici méconnue, est proposée. Après comparaison avec les espèces les plus proches, toutes de la section Pseudodichaea, elle est décrite et illustrée. Abstract A new species of Dichaea (Orchidaceae) from French Guiana – A Dichaea species, rather common in French Guiana, but hit...

Apedium, a new genus in subfamily Cypripedioidea (Orchidaceae) - The species recently described as Selenipedium chironianum from French Guiana shows some characteristics indicating that it should be segregated from the genus Selenipedium: a labellum that is flat, not in the form of a pouch; free lateral sepals, not united into a synsepal; and three...

Abstract Apedium, a new genus in subfamily Cypripedioideae (Orchidaceae) – The species recently described as Selenipedium chironianum from French Guiana shows some characteristics indicating that it should be segregated from the genus Selenipedium: a labellum that is flat, not in the form of a pouch; free lateral sepals, not united into a synsepal;...

Sobralia gnoma (Orchidaceae), a new entity from neotropical cloud forests – During the exploration of karstic areas in the cloud forests of Alta Verapaz (Guatemala), a Sobralia with remarkably small flowers and spirally arranged leaves was collected. It is proposed as a new species, fully described and illustrated.

A new species of lithophytic orchid, belonging to Ponthieva R.Brown, is described, illustrated and compared to Ponthieva ephippium Reichenbach f., its closest relative. This species is associate to the exposed karstic rocks which can be observed along the northern humid arc of Guatemala, a mountain complex with a karstic geologic base favouring hig...

Taxonomic revision of the Encyclia species (Orchidaceae) of French Guiana – Each Encyclia species previously registered for French Guiana is discussed on the basis of the study of herbarium materials and personal observation. An up to date list of taxa is proposed, containing the five species and a variety that are actually present today, the seven...

A new Heterotaxis (Orchidaceae) from French Guiana – A new species in the genus Heterotaxis from French Guiana is proposed. It is characterised notably by its pseudobulbs being strongly swollen in the middle, an uncommon feature within the genus. The taxon is described, illustrated and compared to its closest relatives, Heterotaxis villosa (Barbosa...

Heterotaxis faecalis (Orchidaceae), a showy flower with a fetid odour – The newly resurected genus Heterotaxis is poorly known in Guatemala where it is represented only by three species. A fourth species is presented, closely related to H. villosa (Barbosa Rodrigues) F.Barros, however characterized by its very fetid odour, adapted to its pollinator...

El estudio del género Stanhopea es complicado debido a que las flores son de corta duración y porque la taxonomía de este género se ha centrado en la morfología del labelo. El problema de ello es que los labelos de estas especies son muy carnosos y generalmente se deforman al prensarse y deshidratarse para su preservación en el herbario. Cuando la...

Specklinia viridiflora (Orchidaceae, Pleurothallidinae): new record for the São Paulo state in Brazil and new combination – Pleurothallis viridiflora was hitherto only known from the type locality (Brazil, Rio de Janeiro, Serra dos Órgãos) and considered as rare. In this paper it is recorded, for the first time, in another state: São Paulo, as a ra...

Se describe e ilustra una especie nueva del género Laelia: L. mottae Archila, Chiron, Szlach. & E.A. Pérez-García. Durante muchos años esta especie se consideró como una variante enana de Laelia anceps; sin embargo, el análisis de ejemplares, tanto silvestres como cultivados, permitió establecer que en realidad se trata de dos especies. Laelia mott...

We describe and illustrate a new species of the genus Laelia: L. mottae Archila, Chiron, Szlach. & E.A. Perez-Garcia. For many years, this species was considered a dwarf variant of Laelia anceps; however, the analysis of field-coming and cultivate specimens enabled us to conclude that they actually are two species. Laelia mottae comes from south-ea...

New orchid species from French Guyana – Four taxa, recently found and/or collected by the major author in the forests of French Guyana, are described at the species rank, illustrated and compared to their closest relatives. They belong to the genera Epidendrum, Heterotaxis, Maxillaria and Octomeria.

Vol. 4 deals with Maxillarieae

A new Octomeria (Orchidaceae, Pleurothallidinae) from French Guiana – Two populations of Octomeria recently found in French Guiana were compared to the most closely related species, Octomeria minor and O. deceptrix. They represent a new entity, described and illustrated in this article as Octomeria purpurascens. The checklist of the genus members i...