FIGURE 3 - uploaded by Vincent Droissart
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Illustrative pictures of some central African taxa of the genus Cyrtorchis. A. C. arcuata. B. C. arcuata subsp. whytei. C. C. aschersonii. D. C. brownii. E. C. chailluana. F. C. hamata. G. C. henriquesiana. H. C. injoloensis. I. C. letouzeyi. J. C. monteiroae. K. C. ringens. L. C. submontana. Photographs 'A–G' & 'I–L' by Droissart Vincent and 'H' by Lourens Grobler.
Source publication
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...
Contexts in source publication
Context 2
... cited by De Wildeman (1916), Laurent 1773 from Injolo, Laurent 1758 from Yambuya and Seret 194 from Kiravunga, all from Democratic Republic of the Congo. We designated Laurent 1773 as the lectotype of this taxon because the specimen is more complete and representative of the protologue. . Cyrtorchis chailluana (Hook.f.) Schlechter (1914: 596). (Fig. 3B) Kuntze (1891: 651). Types:-NIGERIA. Banks of the Nun River, September 1860, G.Mann 521 (syntype K!). GABON. Sine loc., P.B.du Chaillu s. n. (BR, BRLU); Yangambi, île Yalututcha en face du poste, 470 m, 20 August 1938, Louis 10948 (BR); ibid., île Esali en face du poste, 470 m, 20 August 1938, Louis 10950 (BR);Kisangani, 20 August 1981, ...
Citations
... guillaumetii Pérez-Vera by Droissart et al. (2009). Actually, all of them belong to C. submontana Stévart, Droissart & Azandi (Azandi et al. 2016), also in agreement with our revision of different materials from this country. We reject the occurrence of C. brownii in this territory, although the taxon could be found according to its distribution range (Azandi et al. 2016). ...
... Actually, all of them belong to C. submontana Stévart, Droissart & Azandi (Azandi et al. 2016), also in agreement with our revision of different materials from this country. We reject the occurrence of C. brownii in this territory, although the taxon could be found according to its distribution range (Azandi et al. 2016). ...
A series of notes on nomenclature and taxonomy, new records and critical taxa for the orchid flora of Equatorial Guinea is presented. Mariarisqueta divina Guinea is lectotypified and isotypes of Angraecum henriquesianum Ridl. and A. quintasii Rolfe are provided. A new subspecies in the genus Eulophia is described. The genera Phaius and Plectrelminthus are first recorded and 20 taxa reported as new for Equatorial Guinea. Habenaria clarencensis Rolfe is synonymised to H. bracteosa Hochst. ex A. Rich. Four taxa are excluded due to misidentifications, one genus and four species need to be confirmed in Equatorial Guinea.
... Here, we choose to concentrate our analysis on the Rubiaceae and the Orchidaceae first because the two families are important component of tropical forest; together they represent about 15% of the Cameroonian vascular flora (Onana 2011), and second because our team have extensively reviewed their taxonomy (e.g. Azandi et al. 2016, Zemagho et al. 2017) and geographic distribution (e.g. Droissart et al. 2011 in Central Africa during the last 20 years. ...
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.
... comprises about 223 species of which 32 are found in western Central Africa with seven endemic to this region (Govaerts et al. 2017). However, we estimate that a large number of Angraecum species are undescribed both in Madagascar and continental Africa, where new angraecoid species continue to be described (e.g.Azandi et al. 2016, Ječmenica et al. 2016, Verlynde et al. 2016, Verlynde et al. 2013). Angraecum sect. ...
Three new species of Angraecum sect. Afrangraecum from Central Africa are here described and illustrated. They are morphologically similar to A. affine and A. cribbianum. Two of them, A. gereauanum and A. geerinckianum, are only known from Massif du Chaillu in Gabon and appear to be closely related based on morphological and preliminary molecular evidence. The third species, A. oliveirae, is endemic to São Tomé. A dichotomous key to all fourteen species of A. sect. Afrangraecum and a table with the distinguishing characters of the three new species and closely allied taxa are provided. A preliminary assessment of the conservation status of the new species is also presented, using the IUCN Red List categories and criteria.
