@article {104, title = {A synopsis of the Sabicea floribunda group (Rubiaceae) from Central Africa, including three new species.}, journal = {Candollea }, volume = {75}, year = {2020}, chapter = {115}, abstract = {

This paper presents a taxonomic revision of the Sabicea floribunda K. Schum. group. Eight species are recognised, of which three are newly described: Sabicea couteronii O. Lachenaud, Zemagho \& Sonk\é (Cameroon, Gabon and Republic of Congo), Sabicea dichrosepala O. Lachenaud, Zemagho \& Sonk\é and Sabicea rubiginosa O. Lachenaud, Zemagho \& Sonk\é (both endemic to Gabon). One subspecies is also described: Sabicea sanguinosa subsp. viridis O. Lachenaud, Zemagho \& Sonk\é and two varieties: Sabicea floribunda var. anisostegia O. Lachenaud, Zemagho \& Sonk\é and Sabicea floribunda var. paludosa O. Lachenaud, Zemagho \& Sonk\é. Lectotypes are selected for Sabicea floribunda var. paucinervis Wernham, Sabicea nobilis R.D. Good, Sabicea segregata Hiern and Sabicea henningsiana B\üttner. All species are illustrated with photographs, and the three new ones also with line drawings; distribution maps and IUCN conservation status assessments are also presented for all taxa.

}, keywords = {RUBIACEAE {\textendash} Sabicea {\textendash} Pseudosabicea {\textendash} Central Africa {\textendash} Lower Guinea {\textendash} Gabon {\textendash}Cameroon {\textendash} Republic of Congo {\textendash} Taxonomy {\textendash} New species.}, doi = {DOI: http://dx.doi.org/10.15553/c2020v751a12.}, author = {Lachenaud, Olivier and Zemagho, Lise and Sonk{\'e}, Bonaventure} } @article {98, title = {Le genre Oxyanthus (Rubiaceae) en Afrique de l{\textquoteright}Ouest: description d{\textquoteright}une nouvelle esp{\`e}ce.}, journal = {Candollea}, volume = {70}, year = {2015}, pages = {241-247}, chapter = {241}, abstract = {

A new species, Oxyanthus andjigae Sonk\é \& O. Lachenaud (Rubiaceae), from Ivory Coast and Sierra Leone, is described
and illustrated. It is closely related to Oxyanthus racemosus (Schumach. \& Thonn.) Keay and Oxyanthus setosus Keay, and
was previously confused with the latter species; however, it differs from both in the longer corolla tube (18-19.5 cm vs
(7-)11-15.5 cm) and the longer hairs on the twigs (1.5-2 mm long vs. \≤ 1 mm in Oxyanthus setosus and \≤ 0.5 mm in
Oxyanthus racemosus). From Oxyanthus setosus it is also separated by the distribution, the latter species occuring from
Nigeria to Gabon. The species is assessed as \“Endangered\” following IUCN Categories and Criteria. A new identification
key to West African species of Oxyanthus DC. is presented; Oxyanthus oliganthus K. Schum. is newly reported from
C\ôte d\’Ivoire and Ghana.

}, doi = {dx.doi.org/10.15553/c2015v702a10.}, author = {Olivier Lachenaud and Bonaventure Sonk{\'e}} } @article {97, title = {Two new species of Oxyanthus D.C. (Rubiaceae) from Central Africa.}, journal = {Candollea}, volume = {71}, year = {2016}, pages = {173-180}, chapter = {173}, abstract = {

Two new Rubiaceae species from Central Africa, Oxyanthus doucetii Sonk\é \& O. Lachenaud and Oxyanthus lewisii
Sonk\é \& 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.

}, doi = {dx.doi.org/10.15553/c2016v712a2.}, author = {B. Sonk{\'e} and O. Lachenaud} } @article {82, title = {Four new species of Sabicea (Rubiaceae) from tropical Africa, with additional notes on the genus. }, journal = {Candollea}, volume = {73}, year = {2018}, month = {23 November 2018}, pages = {277-293}, chapter = {277}, abstract = {

Four new species of Sabicea (Rubiaceae) from tropical Africa are described and illustrated: S. desseinii from Cameroon, Gabon and Equatorial Guinea, S. ezangae from Gabon, S. jongkindii from Liberia and Ghana, and S. uniflora from Gabon. Their affinities are discussed, and the conservation status of each species is assessed. Sabicea speciosissima K.Schum. is excluded from the genus and synonymised with Rothmannia octomera (Hook.) Fagerl. Three other species are sunk into synonymy: Sabicea gigantea Wernham with S. dewevrei De Wild., S. arachnoidea Hutch. \& Dalziel with S. discolor Stapf, and S. neglecta Hepper with S. speciosa K.Schum.

}, keywords = {Africa, Cameroon, Equatorial Guinea, Gabon, Ghana, Liberia, new species, Rubiaceae, Sabicea, taxonomy}, author = {Lise Zemagho and Olivier Lachenaud and Bonaventure Sonk{\'e}} }