01775nas a2200217 4500008004100000245004200041210004000083260001600123300001100139490000800150520118400158653001301342653001701355653001701372653001401389653002401403100001701427700001501444700001601459856008201475 2019 eng d00aA checklist of rheophytes of Cameroon0 achecklist of rheophytes of Cameroon c09 May 2019 a81-1310 v1213 a

Rivers in Cameroon were surveyed to collect and document rheophytic plants. Rheophytes are the dominant aquatic macrophytes in tropical river systems, where they are adapted to extreme environments of rushing water (e.g., river rapids, waterfalls and flash floods). Rheophytic plants are useful indicators of river health. However, their habitats are threatened by human activities such as agriculture, plantation development, alluvial mining and dam construction, particularly in tropical countries. In this survey we documented 66 rheophytic species in 29 genera and 16 families. Two ferns, 8 monocotyledons and 56 dicotyledons were listed. Apart from the Podostemaceae family in which all species are rheophytic, the other 15 families have few species which are rheophytic. Five of these families have up to four species and the remaining 10 have only one member as a rheophytic species. The conservation status of each species is assessed and discussed. This work urges botanists, conservationists, and policy makers to do more to protect the habitats of rheophytes and put in place strategies and action plans for the conservation of this important biological group

10aCameroon10aconservation10adistribution10ainventory10aRheophyte diversity1 aKuetegue, F.1 aSonké, B.1 aAmeka, G.K. uhttps://rubiaceae-africa.myspecies.info/content/checklist-rheophytes-cameroon02683nas a2200193 4500008004100000245014800041210006900189300001200258490000800270520195900278100001302237700001702250700001502267700001602282700001502298700001802313700002102331856013702352 2016 eng d00aPhylogeography of the genus Podococcus (Palmae/Arecaceae) in Central African rain forests: Climate stability predicts unique genetic diversity.0 aPhylogeography of the genus Podococcus PalmaeArecaceae in Centra a126-1380 v1053 a

The tropical rain forests of Central Africa contain high levels of species diversity. Paleovegetation or biodiversity
patterns suggested successive contraction/expansion phases on this rain forest cover during the
last glacial maximum (LGM). Consequently, the hypothesis of the existence of refugia e.g. habitat stability
that harbored populations during adverse climatic periods has been proposed. Understory species are
tightly associated to forest cover and consequently are ideal markers of forest dynamics. Here, we used
two central African rain forest understory species of the palm genus, Podococcus, to assess the role of past
climate variation on their distribution and genetic diversity. Species distribution modeling in the present
and at the LGM was used to estimate areas of climatic stability. Genetic diversity and phylogeography
were estimated by sequencing near complete plastomes for over 120 individuals. Areas of climatic stability
were mainly located in mountainous areas like the Monts de Cristal and Monts Doudou in Gabon, but
also lowland coastal forests in southeast Cameroon and northeast Gabon. Genetic diversity analyses
shows a clear North–South structure of genetic diversity within one species. This divide was estimated
to have originated some 500,000 years ago. We show that, in Central Africa, high and unique genetic
diversity is strongly correlated with inferred areas of climatic stability since the LGM. Our results further
highlight the importance of coastal lowland rain forests in Central Africa as harboring not only high species
diversity but also important high levels of unique genetic diversity. In the context of strong human
pressure on coastal land use and destruction, such unique diversity hotspots need to be considered in
future conservation planning

1 aFaye, A.1 aDeblauwe, V.1 aMariac, C.1 aRichard, D.1 aSonké, B.1 aVigouroux, Y.1 aCouvreur, T.L.P. uhttps://rubiaceae-africa.myspecies.info/content/phylogeography-genus-podococcus-palmaearecaceae-central-african-rain-forests-climate01362nas a2200133 4500008004100000245007100041210006600112300001200178490000700190520089200197100001501089700001801104856010601122 2016 eng d00aTwo new species of Oxyanthus D.C. (Rubiaceae) from Central Africa.0 aTwo new species of Oxyanthus DC Rubiaceae from Central Africa a173-1800 v713 a

Two new Rubiaceae species from Central Africa, Oxyanthus doucetii Sonké & O. Lachenaud and Oxyanthus lewisii
Sonké & O. Lachenaud, are described and illustrated. Oxyanthus doucetii is endemic to Cameroon and is closely related
to Oxyanthus unilocularis Hiern, from which it differs in the minute calyx teeth, the stems with glabrous internodes, the
dorsally glabrous stipules, the flower buds with a shorter head, and the corolla lobes not or hardly acute at apex. Oxyanthus
lewisii is sparsely distributed from Cameroon to eastern Democratic Republic of Congo, and is characterised by narrow
fusiform fruits, glabrous stems, and leaves lacking domatia but sparsely pubescent on the nerves beneath. Both new
species are assessed as “Vulnerable” according to IUCN Red List Categories and Criteria.

1 aSonké, B.1 aLachenaud, O. uhttps://rubiaceae-africa.myspecies.info/content/two-new-species-oxyanthus-dc-rubiaceae-central-africa02329nas a2200145 4500008004100000245008400041210006900125300001200194490000800206520178900214100001802003700001502021700002702036856012002063 2017 eng d00aTaxonomic revision of the African genera Brieya and Piptostigma (Annonaceae). 0 aTaxonomic revision of the African genera Brieya and Piptostigma  a173-2160 v1503 a

Background and aims – Annonaceae are an important family in tropical rain forests of Africa. Here, we
present a revision of the west-central African genus Piptostigma of the tribe Piptostigmateae. Previous
molecular phylogenetic analyses of Piptostigmateae have revealed that the genus as currently circumscribed
is paraphyletic. The aims of the article are: (1) to clarify the generic delimitation of the genus Piptostigma,
especially in relation to its current polyphyletic delimitation; (2) to provide a new updated key to the genera
of tribe Piptostigmateae; and (3) to provide for the first time in over 100 years a complete taxonomic
revision of genera Brieya and Piptostigma.
Material and methods – Normal practices of herbarium taxonomy were used for the morphological study
of about 200 specimens from B, BR, BRLU, G, HBG, K, L, LBV, LISC, MO, P, U, US, WAG, YA and
Z. We sequenced three plastid regions for 32 samples representing 26 ingroup (Piptostigmateae) and six
outgroup species in order to explore the paraphyly of Piptostisma. The open source software QGis was
used to generate the distribution maps of the species and their conservation status was obtained using the
IUCN categories and criteria.
Key results – Molecular and morphological evidence support the reinstatement of the genus Brieya De
Wild. Three keys are presented, one to the genera of Piptostigmateae and the two others to the species of
Brieya and Piptostigma. A total of thirteen species are described for Piptostigma and two for the genus
Brieya. Four new species are presented for the genus Piptostigma: P. macrophyllum, P. mayndongtsaeanum,

1 aGhogue, J.-P.1 aSonké, B.1 aThomas, L.P., Couvreur uhttps://rubiaceae-africa.myspecies.info/content/taxonomic-revision-african-genera-brieya-and-piptostigma-annonaceae01455nas a2200157 4500008004100000245012100041210006900162300001200231490000700243520084700250100001701097700001501114700001401129700001701143856013701160 2017 eng d00aCraterispermum capitatum and C. gabonicum (Rubiaceae): two new species from the Lower Guinean and Congolian Domains.0 aCraterispermum capitatum and C gabonicum Rubiaceae two new speci a103-1180 v833 a

Craterispermum capitatum and C. gabonicum, two new species of Rubiaceae, are described from the Lower
Guinea and Congolian Domains. Detailed descriptions and distribution maps are provided for each species,
their conservation status is assessed and their taxonomic affinities are discussed. Craterispermum
gabonicum is unique within the genus because of the strong dimorphism in brevistylous and longistylous
flowers and inflorescences. We hypothesize that this species shows some form of dioecy. The distribution
of C. capitatum shows a wide disjunction: the species is present in the Lower Guinean and Congolian
Domains but absent from Gabon and South Cameroon. An identification key for the Craterispermum
species present in the Lower Guinean and Congolian Domains is given.

1 aTaedoumg, H.1 aSonké, B.1 aHamon, P.1 aDe Block, P. uhttps://rubiaceae-africa.myspecies.info/content/craterispermum-capitatum-and-c-gabonicum-rubiaceae-two-new-species-lower-guinean-and01437nas a2200157 4500008004100000245015700041210006900198520076700267100002301034700001701057700001501074700001501089700001501104700001801119856014201137 2018 eng d00aNew taxonomic and conservation status of Ossiculum (Vandeae, Orchidaceae), a highly threatened and narrow-endemic angraecoid orchid from Central Africa.0 aNew taxonomic and conservation status of Ossiculum Vandeae Orchi3 a

In the context of producing a revised phylogenetic Linnean taxonomy of angraecoid orchids, the monotypic
and narrow-endemic genus Ossiculum is synonymised with Calyptrochilum. Accordingly, a new combination
in Calyptrochilum is proposed for Ossiculum aurantiacum. The morphological and DNA-based
evidence for this transfer is discussed. Moreover, Calyptrochilum aurantiacum is here firstly reported outside
Cameroon, with a record from the Republic of the Congo. The Red List conservation status of this
species is reassessed and it is to be downgraded from “Critically Endangered” (CR) to “Endangered” (EN),
following the recent discovery of additional subpopulations in Cameroon.

1 aSimo-Droissart, M.1 aStévart, T.1 aSonké, B.1 aMayogo, S.1 aKamdem, N.1 aDroissart, V. uhttps://rubiaceae-africa.myspecies.info/content/new-taxonomic-and-conservation-status-ossiculum-vandeae-orchidaceae-highly-threatened-and02105nas a2200169 4500008004100000245008600041210006900127490000700196520150500203100001401708700002701722700001401749700001501763700001801778700001701796856012201813 2018 eng d00aKupeantha (Coffeeae, Rubiaceae), a new genus from Cameroon and Equatorial Guinea.0 aKupeantha Coffeeae Rubiaceae a new genus from Cameroon and Equat0 v133 a

Two new coffee relatives (tribe Coffeeae, Rubiaceae), discovered during botanical expeditions
to Cameroon, are examined for generic placement, and the placement of three previously
known species (Argocoffeopsis fosimondi, A. spathulata and Calycosiphonia pentamera) is
reinvestigated using plastid sequence (accD-psa1, rpl16, trnL-F) and morphological data.
Seed biochemistry of the new species and pollen micromorphology (only one of the two species)
are also studied. Based on the plastid sequence data, the new taxa are nested in a wellsupported
monophyletic group that includes Argocoffeopsis and Calycosiphonia. Within this
clade, three well-supported subclades are recovered that are morphologically easy to diagnose:
(1) Calycosiphonia (excluding C. pentamera), (2) Argocoffeopsis (excluding A. fosimondi
and A. spathulata), and (3) a clade including the above excluded species, in addition to the
new species. Based on the results, Kupeantha, a new genus of five species, is described,
including two new Critically Endangered taxa from the Highlands of Cameroon: Kupeantha
ebo and K. kupensis. Phytochemical analysis of Kupeantha seeds reveals compounds
assigned as hydroxycinnamic acid derivatives, amino acids and ent-kaurane diterpenoids; caffeine
was not detected. Kupeantha is the first new genus described in tribe Coffeeae in 40
years.
Introduction

1 aCheek, M.1 aAlvarez-Aguirre, M.-G.1 aGrall, A.1 aSonké, B.1 aHowes, M-J.R.1 aLarridon, I. uhttps://rubiaceae-africa.myspecies.info/content/kupeantha-coffeeae-rubiaceae-new-genus-cameroon-and-equatorial-guinea00604nas a2200169 4500008004100000245007500041210006900116100002100185700001700206700001500223700001700238700001400255700001600269700001500285700002100300856011300321 2018 eng d00aTaxonomic revision of the African genus Greenwayodendron (Annonaceae).0 aTaxonomic revision of the African genus Greenwayodendron Annonac1 aLissambou, B.-J.1 aHardy, O.-J.1 aAtteke, C.1 aStévart, T.1 aDauby, G.1 aMbatchi, B.1 aSonké, B.1 aCouvreur, T.L.P. uhttps://rubiaceae-africa.myspecies.info/content/taxonomic-revision-african-genus-greenwayodendron-annonaceae