LAUSR

SummaryMorphological character data are used to show that a distinct morphotype of Dioscorea L. from the Irodo valley (East of Sadjoavato) in Antsiranana Province of Madagascar is an undescribed species, differing in its leaf arrangement, pubescence form and male inflorescence structure from all other taxa. It is described as Dioscorea irodensis Wilkin, Rajaonah & Randriamb., illustrated and a distribution map and ecological information provided. It is known from three sites, but is likely to have been eradicated from one of them. The population that has been studied in the field contains a very low number of adult plants. Tubers have been extracted for use as food at a level that appears to be unsustainable. Thus its provisional IUCN conservation status assessment is that it is critically endangered (CR). Its vernacular name in Irodo is Bemandry.FamintinanaNy toetra sy ny bikan’ny oviala dia azo ampiasaina hanehoana fa miavaka ny oviala iray, izay hita tao anatin’ny lohasahan’Irodo (Atsinanan’i Sadjoavato, faritanin’Antsiranana) ao Avaratr’i Madagasikara, ary tsy mbola voasoritra ny mombamomba azy. Mampihavaka azy amin’ny hafa ireto toetra manaraka ireto: ny fipetraky ny ravina, ny fisian’ny volo, sy ny firafitry ny tahom-bony lahy eo aminy. Nosoritana ho Dioscoreairodensis Wilkin, Rajaonah & Randriamb. izy ity, nampiratiana an-tsary ny momba azy, namoahana saritany ny toerana misy azy, ary nomena ireo vaovao ara-ekolojika mikasika azy. Vondrona oviala miisa telo fara-faha-betsany no fantatra fa misy azy, ary efa ho fongana ny iray amin’ireo. Ny vokatry ny fanadihadiana izay natao tamin’ny vondrona oviala misy no nahitana fa vitsy ny fototra oviala lehibe afaka mamoa, ary maro ireo nohadiana ho sakafo, izay mamaritra sahady fa tsy hateza io karazana io. Noho izany, ny sata fiarovana vonjimaika IUCN dia manombana fa zavamaniry tena tandindomin-doza (CR) io karazana oviala io. Bemandry no fiantso io karazana oviala io any Irodo.