biostudies-literatureUnknown197Nguyen QB<i>Isotremaputalengense</i> Luu, Q.B.Nguyen & H.C.Nguyen is described as a new species from northern Vietnam. It looks most morphologically like <i>I.wardianum</i> but is distinguishable by a combination of different leafy and floral characters. Morphological comparison between the new plant and closest species is provided. In addition, combinations of two recently described <i>Aristolochia</i> species are made, namely <i>Isotremavuquangense</i> (T.V.Do) Luu, Q.B.Nguyen & H.C.Nguyen and <i>Isotremayachangense</i> (B.G.Huang, Yan Liu & Y.S.Huang) Luu, Q.B.Nguyen & H.C.Nguyen.PhytoKeys71-79https://www.ebi.ac.uk/biostudies/studies/S-EPMC9848995biostudies-literature<i>Isotremaputalengense</i>, a new species of Aristolochiaceae from northern Vietnam and two new combinations in <i>Isotrema</i>.PMC9848995Nguyen QBLuu HTNguyen PHNguyen HCTran DBfalse<i>Isotremaputalengense</i>, a new species of Aristolochiaceae from northern Vietnam and two new combinations in <i>Isotrema</i>.<i>Isotremaputalengense</i> Luu, Q.B.Nguyen & H.C.Nguyen is described as a new species from northern Vietnam. It looks most morphologically like <i>I.wardianum</i> but is distinguishable by a combination of different leafy and floral characters. Morphological comparison between the new plant and closest species is provided. In addition, combinations of two recently described <i>Aristolochia</i> species are made, namely <i>Isotremavuquangense</i> (T.V.Do) Luu, Q.B.Nguyen & H.C.Nguyen and <i>Isotremayachangense</i> (B.G.Huang, Yan Liu & Y.S.Huang) Luu, Q.B.Nguyen & H.C.Nguyen.2022-01-01T00:00:00Z20222025-04-18T21:16:45.985Z2025-04-07T09:17:03.506ZS-EPMC98489953676067210.3897/phytokeys.197.73596