A key to the species of Keetia (Rubiaceae - Vanguerieae) in West Africa, with three new, threatened species from Guinea and Ivory Coast

Cheek, Martin; Magassouba, Sékou; Molmou, Denise; Doré, Tokpa Seny; Couch, Charlotte; Yasuda, Shigeo; Gore, Charlie; Guest, Amy; Grall, Aurélie; Larridon, Isabel; Bousquet, Isabelle H.; Ganatra, Bela; Gosline, George

doi:10.1007/s12225-018-9783-0

Cited by 19 publications

(19 citation statements)

References 28 publications

(11 reference statements)

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“…As a result, many names in Lisowski’s Flore de la Guinée are out of date (Cheek et al 2015), and since its publication about 20 newly discovered species (e.g. Cheek & Haba 2016, Cheek et al 2018b) and many new range extensions have been recorded in Guinea. Where a recently discovered species was chosen for a CAP, the protologue (original scientific publication) has been used as the source for the taxonomic information.…”

Section: Methodsmentioning

confidence: 99%

An analysis of Species Conservation Action Plans in Guinea

Couch

Molmou

Magassouba

et al. 2020

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To achieve conservation success, we need to support the recovery of threatened species. Yet, <5% of plant species listed as threatened on the IUCN Red List have Species Conservation Action Plans (CAPs). If we are to move from a Red List to a Green List for threatened plant species, CAPs need to be devised and implemented. Guinea is one of the most botanically diverse countries in West Africa. Recent research found that nearly 4000 vascular plants occur in Guinea, a 30% increase from previous estimates. 273 of these plant species are now assessed as threatened with global extinction. There is increasing pressure on the environment from the extractive industry and a growing population. In parallel with implementation of an Important Plant Area programme in Guinea, CAPs were developed for 20 threatened plant species. These plans elaborate conservation efforts needed first to safeguard threatened species both in situ and ex situ and then to support their recovery. We document the approach used to assemble the Species Conservation Action Plans, and we discuss the importance of having up to date field information, IUCN Red List assessments, and use of a collaborative approach. The need for these plans is increasingly important with recent calculations suggesting a third of African plants are threatened with extinction. This paper outlines initial detailed plant conservation planning in Guinea and offers a template for conservation practitioners in other tropical African countries to follow.

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Section: Methodsmentioning

confidence: 99%

An analysis of Species Conservation Action Plans in Guinea

Couch

Molmou

Magassouba

et al. 2020

Preprint

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“…Recent surveys in Guinea connected with the Guinea Tropical Important Plant Area programme (TIPAs) have discovered several other new species to science, all of which are threatened. Several of these are like Saxicolella futa, also rheophytes, restricted to fast flowing water habitats, such as Inversodicraea pepehabai Cheek (Cheek & Haba 2016), I. koukoutamba and I. tassing (Cheek et al 2019a), Karima scarciesii (Scott Elliot) Cheek , Lebbiea grandiflora Cheek (Cheek & Lebbie 2018;Couch et al 2019), while others are also found on the sandstone rock of the Futa such as Keetia futa (Cheek et al 2018a), Calophyllum africanum (Cheek & Luke 2016), and Kindia gangan Cheek (Cheek et al 2018b).…”

Section: Recognitionmentioning

confidence: 99%

Taxonomic Monograph ofSaxicolella(Podostemaceae), African waterfall plants highly threatened by Hydro-Electric projects, with five new species

Cheek

Molmou

Magassouba

et al. 2021

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The genus Saxicolella Engl. (Podostemaceae) are African rheophytes, restricted to rapids and waterfalls as are all members of the family. Previously, Saxicolella sensu lato was shown to be polyphyletic with two separate clades in the molecular phylogenetic study of Koi et al. (2012). The name Pohliella Engl. was recently resurrected for one clade that is sister to the American genera Ceratolacis (Tul.)Wedd., Podostemum Michx. and all Old World Podostemoideae (podostemoids) (Cheek 2020). Pohliella has distichous phyllotaxy, bilocular ovaries, filiform roots with paired holdfasts, and rootcaps. The second clade, Saxicolella sensu stricto, including the type of the generic name, has spiral phyllotaxy, unilocular ovaries, ribbon-like or crustose roots that lack both holdfasts and rootcaps. Saxicolella sensu stricto, sampled from the type species, S. nana Engl. of Cameroon, is embedded within and near the base of the major clade of African podostemoids and is sister to all other African genera apart from Inversodicraea R.E.Fr. and Monandriella Engl. Recently reduced to three species in Cameroon and S.E. Nigeria by the resurrection of Pohliella (3 to 4 species in Ghana and Nigeria and Cameroon), Saxicolella sensu stricto is expanded to eight species in this monograph by description of five new taxa. Saxicolella futa Cheek and S. deniseae Cheek are newly described from Guinea, S. ijim Cheek from Cameroon, the informally named S. sp. A from Gabon, and S. angola Cheek from Angola. The known geographic range of the genus is thus expanded c. 2,500 km westwards to Guinea from eastern Nigeria and c.1,500 km southeastwards from Cameroon to Cuanza do Sul, Angola. The greatest concentration of species occurs in the Cross Sanaga interval of western Cameroon and eastern Nigeria, with three species. Cameroon (3 species) followed by Nigeria and Guinea (2 species each) are the countries with highest species diversity. The genus can be expected to be found in Sierra Leone, Liberia, Ivory Coast and Congo Republic. A classification is proposed grouping the species into three subgenera (Saxicolella, Butumia (G.Taylor) Cheek comb. et. stat. nov. and Kinkonia Cheek subgen. nov.) based on root morphology and shoot position and morphology. The discovery, morphology, circumscription, distribution, and ecology of Saxicolella is reviewed, an identification key to the species is presented, together with descriptions, synonymy, links to illustrations, and extinction risk assessments for each of the eight species now recognised. All of the species are provisionally assessed as either Endangered or Critically Endangered using the IUCN 2012 standard, making this genus among the most threatened of its size globally. The major threats, above all, are hydro-electric projects. Saxicolella deniseae may already be globally extinct, and two of the four known locations of S. angola appear lost, S. sp. A of Gabon is threatened at at least one of its three locations, while Saxicolella futa is threatened at all three locations, all due to incipient or active hydro electric projects. Contamination of watercourses by increased turbidity from silt-load due anthropic changes and by eutrophication from pollution are also threats for the majority of the species.

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“…Those recently discovered taxa specific to sandstone substrate in the S part of the Fouta Djalon are Gladiolus mariae Burgt (Burgt & al. 2019), Keetia susu Cheek (Cheek & al. 2018c), Kindia gangan Cheek (Cheek & al.…”

Section: New Species From the Guinea Highlandsmentioning

confidence: 99%