Article

Kew Bulletin

, Volume 64, Issue 3, pp 461-468

Dioscorea orangeana (Dioscoreaceae), a new and threatened species of edible yam from northern Madagascar

  • Paul WilkinAffiliated withRoyal Botanic Gardens Email author 
  • , Annette HladikAffiliated withUMR 5145 et USM 104, Éco-Anthropologie et Ethnobiologie, CNRS & Muséum national d’Histoire naturelle
  • , Odile WeberAffiliated withRoyal Botanic Gardens
  • , Claude Marcel HladikAffiliated withUMR 5145 et USM 104, Éco-Anthropologie et Ethnobiologie, CNRS & Muséum national d’Histoire naturelle
  • , Vololoniana JeannodaAffiliated withDépartement de Biologie et Ecologie Végétales, Faculté des Sciences, Université d’Antananarivo

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Summary

A new species of yam (Dioscorea orangeana Wilkin) is described and illustrated. It differs from D. comorensis R.Knuth by having undulate leaf margins and a broader torus and tepals in both the male and female flowers. In female flowers of D. orangeana the floral stipe between the ovary and the torus is shorter than in D. comorensis. The tuber morphology of the species is atypical among Malagasy species in that there are several digitate lobes rather than a single tuber per growing season, although more research is needed on tuber morphology. D. orangeana is reported to be edible. It is endemic to the Forêt d’Orangea near Diego Suarez (Antsiranana) in Antsiranana Préfecture. Its conservation and sustainable use are thus matters of concern.

Keywords

conservation Dioscorea Dioscoreaceae edible Madagascar new species yams