Abstract
The only representatives ofRubiaceae-Rubieae in Madagascar are five species ofGalium. G. thunbergianum andG. chloroionanthum are essentially afromontane species, ± widely distributed in both the African mainland and Madagascar. The new speciesG. andringitrense andG. ankaratrense are endemic to Madagascar but show close affinities to two afromontane—afroalpine groups from the African mainland, theG. simense—G. ruwenzoriense andG. glaciale complex respectively.G. polyacanthum (new combination) exhibits certain primitive morphological traits and appears to be an old Madagascan endemic without close allies. New chromosome counts for populations from the African mainland demonstrate thatG. chloroionanthum andG. simense are 4x (x=11). Distribution patterns and origins of theGalium species in Madagascar and their relationships with African taxa are discussed.
Résumé
Cinq espèces du genreGalium sont les seuls représentants desRubiaceae-Rubieae à Madagascar.G. thunbergianum etG. chloroionanthum sont deux espèces essentiellement “afromontanes” d'une distribution ± ample en Afrique et dans l'île de Madagascar.G. andringitrense etG. ankaratrense (espèces nouvelles) sont endémiques mais ils témoignent d'une affinité étroite avec les complexes “afromontanes”—“afroalpines” duG. simense—G. ruwenzoriense et duG. glaciale en Afrique.G. polyacanthum (combinaison nouvelle), charactérisé
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Puff, C., Mantell, D.E. Revision and affinities ofGalium (Rubiaceae) in Madagascar. Pl Syst Evol 140, 57–73 (1982). https://doi.org/10.1007/BF02409897
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DOI: https://doi.org/10.1007/BF02409897