July 2023
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A new species, Arisaema ytyense is described here for the first time, belonging to section Sinarisaema . Including the species described here three species from sect. Sinarisaema are present in Vietnam. The morphological features of this species are discussed and compared with those belonging to the same section within Vietnam. The authors introduce a species key to Vietnamese Arisaema sect. Sinarisaema and the ecology, habitat and conservation status of this new species is discussed.