Kew Bulletin

, Volume 64, Issue 3, pp 461–468 | Cite as

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

  • Paul Wilkin
  • Annette Hladik
  • Odile Weber
  • Claude Marcel Hladik
  • Vololoniana Jeannoda
Article

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 

References

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Copyright information

© The Board of Trustees of the Royal Botanic Gardens, Kew 2009

Authors and Affiliations

  • Paul Wilkin
    • 1
  • Annette Hladik
    • 2
  • Odile Weber
    • 1
  • Claude Marcel Hladik
    • 2
  • Vololoniana Jeannoda
    • 3
  1. 1.Royal Botanic GardensSurreyUK.
  2. 2.UMR 5145 et USM 104, Éco-Anthropologie et EthnobiologieCNRS & Muséum national d’Histoire naturelleBrunoyFrance.
  3. 3.Département de Biologie et Ecologie Végétales, Faculté des SciencesUniversité d’AntananarivoAntananarivoMadagascar.

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