03328nas a2200313 4500008004100000245010800041210006900149300001400218490000800232520226700240653002202507653001402529653002202543653002302565653002402588653001402612653002602626653001402652653002202666100002902688700002402717700002302741700002202764700002202786700002302808700002602831700002002857856013702877 2016 eng d00aMorphometrics and molecular phylogenetics of Angraecum section Dolabrifolia (Orchidaceae, Angraecinae).0 aMorphometrics and molecular phylogenetics of Angraecum section D a1027-10450 v3023 a

Background and aims – Recent molecular studies suggest the polyphyly of Angraecum and the
unnaturalness of some of its sections, as exemplified by sect. Pectinaria, which has species in two wellseparated
clades, one in Madagascar and the other in continental Africa. However, species delimitation
among the five continental African members remained problematic due to morphological variability. In
preparation for the taxonomic revision of this group, we used morphological and molecular data to re-assess
the circumscription of each species, and to evaluate their monophyly and relationships to one another.
Methods – A total of 59 alcohol-preserved specimens were used to perform multivariate analyses on 37
morphological characters. DNA sequences from one nuclear (ITS-1) and five plastid regions (matK, rps16,
trnL–F, trnC–petN and ycf1) were analyzed using Parsimony and Bayesian methods.
Key results – The morphometric study revealed five distinct morphospecies that correspond to the concepts
of the currently recognized species. Angraecum doratophyllum and A. subulatum are the most distinct
morphologically, whereas A. atlanticum, A. gabonense and A. pungens are most similar to one another.
Phylogenetic analyses using a combined data set of the six markers yielded highly resolved, congruent
trees with strong branch support. The polyphyly of A. sect. Pectinaria is confirmed, with continental
African members appearing to be most closely related to sect. Dolabrifolia, found exclusively in Africa.
The multiple accessions of A. doratophyllum, A. gabonense, A. pungens and A. subulatum each formed a
well-supported clade. Parsimony and Bayesian analyses placed A. atlanticum and A. pungens in a subclade
within which samples of A. pungens were nested but those of A. atlanticum formed a grade. These two
species can be easily distinguished morphologically by leaf dimensions and flower length, but broader
sampling in continental Africa is needed to test whether individuals recognized as A. atlanticum might
represent two distinct taxa.
 

10aAngraecoid orchid10aAngraecum10aBayesian analyses10acontinental Africa10amolecular phylogeny10amonophyly10amorphometric analyses10aparsimony10asect. Pectinaria.1 aSimo-Droissart, Murielle1 aSonké, Bonaventure1 aDroissart, Vincent1 aMicheneau, Claire1 aLowry, Porter, P.1 aHardy, Olivier, J.1 aPlunkett, Gregory, M.1 aStévart, Tariq uhttps://rubiaceae-africa.myspecies.info/content/morphometrics-and-molecular-phylogenetics-angraecum-section-dolabrifolia-orchidaceae01958nas a2200181 4500008004100000245017500041210006900216300001200285490000800297520118800305100001801493700002001511700002401531700002901555700002401584700002301608856014501631 2016 eng d00aSynoptic revision of the genus Cyrtorchis Schltr. (Angraecinae, Orchidaceae) in Central Africa, with the description of a new species restricted to submontane vegetation.0 aSynoptic revision of the genus Cyrtorchis Schltr Angraecinae Orc a165-1860 v2673 a

As a preliminary step to the taxonomic revision of the genus Cyrtorchis, a synoptic revision of the species occurring in Central
Africa was undertaken. Based on a detailed examination of 1,039 herbarium specimens, including nomenclatural types,
we have recognized 14 species in Central Africa (one of which is divided into two subspecies), including one new species
that the study brought to light, described here as Cyrtorchis submontana. The new species closely resembles C. guillaumetii
and C. brownii in general aspect, but differs from them in having thinner, small elliptic leaves and shorter, fewer-flowered,
more lax inflorescences with shorter bracts. The species is restricted to submontane vegetation of Central Africa and is assessed
as Endangered following the IUCN Red List Categories and Criteria. Cyrtorchis latibracteata and C. subcylindrifolia
are lectotypified, and the latter is placed as a synonym under C. henriquesiana. Many new records are reported, and for each
taxon the distribution, habitat and ecology are given. An identification key for the Central African taxa is also provided.

1 aAzandi, Laura1 aStévart, Tariq1 aSonké, Bonaventure1 aSimo-Droissart, Murielle1 aAvana, Marie-Louise1 aDroissart, Vincent uhttps://rubiaceae-africa.myspecies.info/content/synoptic-revision-genus-cyrtorchis-schltr-angraecinae-orchidaceae-central-africa-description01945nas a2200181 4500008004100000245013700041210006900178300001300247490000800260520121100268100002901479700002401508700002301532700002401555700002201579700002001601856014201621 2016 eng d00aA taxonomic revision of Angraecum section Dolabrifolia (Orchidaceae, Angraecinae), with the description of a new species from Gabon.0 ataxonomic revision of Angraecum section Dolabrifolia Orchidaceae a81–1150 v2803 a

Despite a paucity of material available from continental Africa, previous morphological and molecular phylogenetic studies
have suggested that Angraecum, the largest genus of the angraecoid orchids, is polyphyletic. A recent study based on
broad sampling from the region confirmed the monophyly of section Dolabrifolia and a clear delimitation of four of its five
members, one of which represents a new species. Based on these results, a comprehensive taxonomic revision of Angraecum
sect. Dolabrifolia is presented here. It includes an identification key and a detailed description of each species, along with
color photographs, distribution maps, information on habitat and phenology, and a preliminary risk of extinction assessment
according to the IUCN Red List categories and criteria. Species richness in the section is highest in Atlantic Central Africa
and around the Albertine Rift. The new species, A. biteaui, is described and illustrated with line drawings. It most closely
resembles A. aporoides in general aspect but differs in both foliar and floral characters, and is only known from lowland
forests in Gabon.

1 aSimo-Droissart, Murielle1 aSonké, Bonaventure1 aDroissart, Vincent1 aGeerinck†, Daniel1 aLowry, Porter, P.1 aStévart, Tariq uhttps://rubiaceae-africa.myspecies.info/content/taxonomic-revision-angraecum-section-dolabrifolia-orchidaceae-angraecinae-description-new39698nas a2200325 45000080041000002450113000412100069001543000009002234900008002325203860200240653001738842653002338859653002538882653003138907653001638938653001238954653001438966653002238980100002339002700002339025700001839048700002039066700002139086700003039107700002939137700002039166700002239186700002439208856014039232 2019 eng d00aMine versus Wild: a plant conservation checklist of the rich Iron-Ore Ngovayang Massif Area (South Cameroon)0 aMine versus Wild a plant conservation checklist of the rich Iron a8-290 v1523 a

16.00 Normal 0 21 false false false FR-BE X-NONE X-NONE

Background and aims – The rapid expansion of human activities in South Cameroon, particularly mining in mountainous areas, threatens this region’s exceptional biodiversity. To comprehend the effects of land-use change on plant diversity and identify conservation priorities, we aim at providing a first comprehensive plant checklist of the Ngovayang Massif, focusing on the two richest plant families, Orchidaceae and Rubiaceae.

Location – The Ngovayang Massif Area (NMA) is located in the South Region of Cameroon. It is covered by lowland and submontane rainforest (100 to 1110 m elevation).

Methods – We compiled a dataset of 6116 georeferenced herbarium specimens, of which 2787 belong to Rubiaceae and Orchidaceae. We used rarefaction methods to explore sampling and diversity patterns, and investigated the altitudinal distribution of rare and/or threatened taxa.

Key results – The NMA, which houses about 1500 vascular plant taxa, is the richest documented area for Rubiaceae in Atlantic Central Africa (ACA) and the fifth for Orchidaceae, with respectively 281 and 111 taxa. Among these taxa, 178 (45%) are endemic to ACA and 67 (17%) are considered globally threatened according to IUCN categories and criteria. We show that higher elevation areas (> 750 m), which are also the main areas targeted for mining, are the richest in endangered and/or rare species. Three new records for Cameroon are reported here.

Conclusion – The NMA represents an Important Plant Area of Cameroon as confirmed by its exceptional plant diversity (> 20% of the total Flora of Cameroon), by the concentration of many threatened and/or restricted range species (10 taxa are strict endemics of the massif) as well as by the threat on rare habitats (i.e. the submontane vegetation above ~750 m elevation). A management plan involving in situ and ex situ conservation actions is urgently needed to reduce the potential threats of future mining activities.

10aBiodiversity10aendangered species10aImportant Plant Area10airon and gold exploitation10anew records10aorchids10aRubiaceae10asubmontane forest1 aDroissart, Vincent1 aLachenaud, Olivier1 aDauby, Gilles1 aDessein, Steven1 aKamdem, Gyslène1 aK., Charlemagne, Nguembou1 aSimo-Droissart, Murielle1 aStévart, Tariq1 aTaedoumg, Hermann1 aSonké, Bonaventure uhttps://rubiaceae-africa.myspecies.info/content/mine-versus-wild-plant-conservation-checklist-rich-iron-ore-ngovayang-massif-area-south