@article {93, title = {Phylogenetics of tribe Sabiceeae (Ixoroideae, Rubiaceae) revisited, with a new subgeneric classification for Sabicea.}, journal = {Botanical Journal of Linnean Society}, volume = {182}, year = {2016}, pages = {551-580}, chapter = {551}, abstract = {

Tribe Sabiceeae (Ixoroideae, Rubiaceae) has undergone recent taxonomical changes with the incorporation of the
related genera Ecpoma, Pseudosabicea and Stipularia into the type genus Sabicea. We use phylogenetic analysis
and morphological data to verify the relationships among members of the tribe, including the most
comprehensive taxon sampling of the tribe to date with 74 of 145 species. Sequence data from the nuclear
internal transcribed spacer (ITS) and three plastid markers (petD, rps16, trnT\–F) were used to infer relationships
among the members of the tribe. Individual analyses using maximum likelihood, parsimony and Bayesian
approaches reveal several supported clades: the former genus Stipularia is resolved as a monophyletic unit, but
Ecpoma is monophyletic only if Sabicea urbaniana and Sabicea xanthotricha are included (corresponding to
Sabicea subgenus Stipulariopsis sensu Wernham). Pseudosabicea is biphyletic, with one clade corresponding to
section Anisophyllae of Halle (1964) and the other one to the other sections (Floribundae and Sphaericae) of the
genus. Eleven morphological characteristics were recorded for all species studied and seven have been mapped
onto the phylogenetic tree to study their evolution in the group and assess their value for the classification of
Sabicea s.l. Finally, our study shows that a combination of diagnostic characteristics should be used to
differentiate each group and we propose to recognise four subgenera in Sabicea.

}, doi = {10.1111/boj.12475.}, author = {Lise Zemagho and Sigrid Liede-Schumann and Bonaventure Sonk{\'e} and Steven Janssens and Olivier Lachenaud and Brecht Verstraete and Steven Dessein} } @book {81, title = {Taxonomic revision of Sabicea subgenus Anisophyllae (Ixoroideae, Rubiaceae) from Tropical Africa, with four new species. Phytotaxa 293(1): 68 p. doi.org/10.11646/phytotaxa.293.1. Magnolia Press, Auckland, New Zealand.}, year = {2017}, abstract = {

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A taxonomic revision of Sabicea subgenus Anisophyllae (Rubiaceae), a group restricted to Central and East Africa, is presented here. This work, based on a study of herbarium specimens and field observations in Cameroon and Gabon, includes a survey of the morphological features of the group, a key to the species, descriptions of all the taxa, and IUCN conservation status assessments. Fifteen species are recognised, four of which are described as new (Sabicea mapiana, S. ndjoleensis, S. parmentierae, S. sciaphilantha), while three former varieties are raised to species rank (S. crystallina, S. jacfelicis, S. tersifolia) and one species previously sunk into synonymy is restored (S. bequaertii). Two new infraspecific taxa are also described, Sabicea crystallina subsp. engongensis and S. sciaphilantha subsp. hirsuta. The group has its center of diversity in Gabon, where 10 of the 15 species occur, three of them being endemic to the country.

}, author = {Lise Zemagho and Sigrid Liede-Schumann and Olivier Lachenaud and Steven Dessein and Bonaventure Sonk{\'e}} }