The threatened edible yams of the Dioscorea sambiranensis R.Knuth species complex (Dioscoreaceae): a new species and subspecies

Adansonia

Odile Weber¹  Vololoniaina Jeannoda¹  Paul Wilkin¹  Annette Hladik¹ 

关键词: Dioscoreaceae;    Dioscorea;    yams;    Madagascar;    endemic;    edible;    conservation;    new species;    new subspecies;    Dioscoreaceae;    Dioscorea;    ignames;    Madagascar;    endémique;    comestible;    conservation;    espèce nouvelle;    sous-espèce nouvelle;   

DOI  :  10.5252/a2009n2a2

学科分类：植物学

来源: Museum National d Histoire Naturelle

【 摘 要 】

TheDioscoreasambiranensisspeciescomplexisendemictoNorthernandNorth-WesternMadagascar.Itstaxahavebroad,cordateleaveswithpetiolesroughlyequalinlengthtotheblade,laxmaleinflorescenceswithflowersonlongpedicelsarrangedincymulesofusuallyfiveormoreflowersandflatdiscoidfloraltori.Followingstudyofitsmorphologicalvariation,twonewtaxainthecomplexaredescribedandillustrated.DioscoreabuckleyanaWilkinwaspartofamixedtaxonomicconceptundertheinvalidnameD.sambiranensisR.Knuthsubsp.ambrensisH.Perrier.ItisglabrouslikeD.pteropodaH.Perrier,butdiffersinpetioleandleafblademorphology(especiallybladetexture),pedicellengthandcapsulemorphology.ClarificationofthelimitsofD.sambiranensisR.Knuthrevealedanundescribedsubspecies,subsp.bardotiaeWilkin,whichdiffersinleafbladeandpetioledimensions,andlacksthesurfaceornamentationoftheovaryandcapsulefoundinsubsp.sambiranensis.TherelationshipofD.sambiranensiswithD.namorokensisWilkinisrevealed.Keys,descriptionsandadistributionmapareprovidedforallthetaxacovered,andconservationstatusassessmentsgiven.Thelattershowthatallofthetaxaofthecomplexare,orarelikelytobe,threatened.

【 授权许可】

Unknown