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The genus    Nekemias    (  Vitaceae  ) was first recognized by Rafinesque in 1838. It has been treated as a synonym of    Ampelopsis    Michx. Recent phylogenetic studies suggest that    Ampelopsis    as traditionally delimited is paraphyletic. To maintain the monophyly of each of the genera of   Vitaceae  , we herein segregate the   Ampelopsis   sect.   Leeaceifoliae   lineage from    Ampelopsis    and recognize these taxa in    Nekemias    Raf., which has a disjunct distribution in eastern to southeastern Asia and eastern North America. Nomenclatural changes are made for nine species and one variety:    Nekemias   arborea    (L.) J. Wen &amp; Boggan,    N.   cantoniensis    (Hook. &amp; Arn.) J. Wen &amp; Z.L. Nie,    N.   celebica    (Suess.) J. Wen &amp; Boggan,    N.   chaffanjonii    (H. Lév. &amp; Van.) J. Wen &amp; Z.L. Nie,    N.   gongshanensis    (C.L. Li) J. Wen &amp; Z.L. Nie,    N.   grossedentata    (Hand.-Mazz.) J. Wen &amp; Z.L. Nie,    N.   hypoglauca    (Hance) J. Wen &amp; Z.L. Nie,    N.   megalophylla    (Diels &amp; Gilg) J. Wen &amp; Z.L. Nie,   N.   megalophylla   var.   jiangxiensis   (W.T. Wang) J. Wen &amp; Z.L. Nie, and    N.   rubifolia    (Wall.) J. Wen &amp; Z.L. Nie. A taxonomic key is provided for the genus to facilitate identification.

phytokeys

Synopsis of    Nekemias    Raf., a segregate genus from    Ampelopsis    Michx. (  Vitaceae  ) disjunct between eastern/southeastern Asia and eastern North America, with ten new combinations