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Le genre Sabicea (Rubiaceae) à São Tomé (São Tomé et Príncipe)

G. Joffroy
Systematics and Geography of Plants
Vol. 71, No. 2, Plant Systematics and Phytogeography for the Understanding of African Biodiversity (2001), pp. 383-390
DOI: 10.2307/3668686
Stable URL: http://www.jstor.org/stable/3668686
Page Count: 8
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Le genre Sabicea (Rubiaceae) à São Tomé (São Tomé et Príncipe)
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Abstract

Four species of Sabicea Aublet (Rubiaceae) are present in São Tomé (République démocratique de São Tomé et Príncipe, gulf of Guinea): S. ingrata K.Schum., S. exellii G.Taylor, S. insularis (Wernham) G.Taylor and S. thomensis Joffroy. A principal component analysis undertaken for these species using morphological characters of herbarium specimens shows that S. insularis and S. ingrata cannot be easily separated. As a result the new combination S. ingrata var. insularis (Wernham) Joffroy is made. Distribution maps and an identification key for the four taxa of Sabicea in São Tomé are presented. Relations between São Tomé taxa and species of continental Africa are also discussed. /// Quatre espèces du genre Sabicea Aublet (Rubiaceae) sont signalées à São Tomé (République démocratique de São Tomé et Príncipe, golfe de Guinée): S. ingrata K.Schum., S. exellii G.Taylor, S. insularis (Wernham) G.Taylor et S. thomensis Joffroy. Une analyse en composantes principales basée sur des caractères morphologiques mesurés sur échantillons d'herbier montre que S. insularis et S. ingrata sont difficilement séparables. Ainsi la nouvelle combinaison S. ingrata var. insularis (Wernham) Joffroy est proposée. Les cartes de distribution et une clé de détermination pour les quatre taxons de Sabicea de São Tomé sont présentées. Les relations entre les taxons de São Tomé et les espèces de l'Afrique continentale sont aussi discutées.

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