01741nas a2200157 4500008004100000020001400041245009700055210006900152300001200221490000700233520123500240100001501475700002301490700001801513856005201531 2007 eng d a0107-055X00aCalycosiphonia pentamera sp nov (afrotropical Rubiaceae) from the 'Lower Guinea' area0 aiCalycosiphonia pentamerai sp nov afrotropical Rubiaceae from th a275-2800 v253 a

A distinctive new species of Calycosiphonia (Rubiaceae) is described and illustrated. It is endemic to the Lower Guinea Domain of the Guineo-Congolian Region, where it is restricted to south Cameroon and Monte Alen National Park (Equatorial Guinea). Its conservation status is assessed as Vulnerable according to the Red list criteria of IUCN. Calycosiphonia pentamera sp. nov. is the third species known from the genus. Molecular data have recently shown that the genera Calycosiphonia and Argocoffeopis form a single clade, but leave some open questions on how to distinguish and delimit the two genera. In the present state of knowledge, the novelty should be placed in Calycosiphonia based on morphological evidence: shrubs with large leaves becoming blackish in the dried state, inflorescences axillary and paired at the nodes, and fruits exceeding 15 mm in diameter. The 5-merous condition of the flowers and the presence of standard anthers (without transverse septa in the thecae) in C. pentamera are features not previously recorded from the genus. They require a better understanding in the framework of a more robust Molecular phylogeny, allowing character analysis of the Calycosiphonial/Argocoffeopsis clade.

1 aSonké, B.1 aMarie-Noel, D., K.1 aRobbrecht, E. uhttps://rubiaceae-africa.myspecies.info/node/5000471nas a2200133 4500008004100000245011200041210006900153300001200222490000700234100001500241700001300256700001600269856005200285 2009 eng d00aSynopsis of the genus Mitriostigma (Rubiaceae) with a new monocaulous species from Southern Cameroon0 aSynopsis of the genus iMitriostigmai Rubiaceae with a new monoca a305-3120 v271 aSonké, B.1 aSimo, M.1 aDessein, S. uhttps://rubiaceae-africa.myspecies.info/node/54