Citronella suaveolens, a new generic record for Vietnam, with a key to Vietnamese Cardiopteridaceae Author Nuraliev, Maxim S. Joint Russian-Vietnamese Tropical Scientific and Technological Center, Cau Giay, Hanoi, Vietnam. & Department of Higher Plants, Biological Faculty, M. V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, Moscow, 119234, Russia. Author Schori, Melanie 0000-0002-2801-635X National Germplasm Resources Laboratory, US Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705 - 2350, USA. & melanie. schori @ usda. gov; https: // orcid. org / 0000 - 0002 - 2801 - 635 X melanie.schori@usda.gov Author Tagane, Shuichiro 0000-0002-1974-7329 The Kagoshima University Museum, Kagoshima University, 1 - 21 - 30, Korimoto, Kagoshima, 890 - 0065, Japan. & stagane 29 @ gmail. com; https: // orcid. org / 0000 - 0002 - 1974 - 7329 stagane29@gmail.com Author Kuznetsov, Andrey N. Joint Russian-Vietnamese Tropical Scientific and Technological Center, Cau Giay, Hanoi, Vietnam. & A. N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences, 33, Leninsky av., Moscow, 119071, Russia. Author Kuznetsova, Svetlana P. 0000-0002-7610-5058 Joint Russian-Vietnamese Tropical Scientific and Technological Center, Cau Giay, Hanoi, Vietnam. & tropcenterhanoi @ mail. ru; https: // orcid. org / 0000 - 0002 - 7610 - 5058 tropcenterhanoi@mail.ru Author Utteridge, Timothy M. A. 0000-0003-2823-0337 Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW 9 3 AB, United Kingdom. & t. utteridge @ kew. org; https: // orcid. org / 0000 - 0003 - 2823 - 0337 t.utteridge@kew.org text Phytotaxa 2022 2022-01-25 532 1 67 77 journal article 2432 10.11646/phytotaxa.532.1.5 fae826ef-a247-4079-a039-528fcd2b1e77 1179-3163 5900904 Key to the genera and species of Cardiopteridaceae in the flora of Vietnam Distinction of genera is based on Schori (2016) ; key to the species of Cardiopteris follows Gagnepain (1911) . 1. Liana with whitish latex; leaf blade entire or lobed, truncate to cordate at base, palmatinerved; corolla gamopetalous; stamens epipetalous; fruit a samara with a fleshy terminal appendage....................................................................................2 ( Cardiopteris ) - Trees or shrubs without latex; leaf blade entire, acute to obtuse at base (never cordate), penninerved; corolla choripetalous or gamopetalous; stamens free or epipetalous; fruit a drupe ..................................................................................................................3 2. Inflorescence with 2–6 cincinni; fruit stipe not or shortly exceeding calyx, ca. 2 mm long; fruit distinctly longer than wide, obcordate .................................................................................................................................................... Cardiopteris quinqueloba - Inflorescence with 15 or more cincinni; fruit stipe greatly exceeding calyx, 7–8 mm long; fruit oval to nearly circular in outline... ....................................................................................................................................................................... Cardiopteris platycarpa 3. Flowers unisexual; corolla gamopetalous, tube often longer than lobes; stamens epipetalous, included in corolla............................ ............................................................................................................................................................... Gonocaryum ( G. lobbianum ) - Flowers bisexual or unisexual; corolla choripetalous; stamens free, exserted from corolla (in female flowers, staminodes included) .................................................................................................................................................... Citronella ( C. suaveolens )