Maximum-likelihood phylogenetic tree of Amorphophallus kiusianus and 18 other related taxa in the family Araceae. Spirodela polyrhiza is used as an outgroup. The scale bar represents the number of substitutions at each locus. Accession numbers: Amorphophallus kiusianus, PP072243 (this study); Amorphophallus krausei, OR400248 (Yin and Gao 2023b); Amorphophallus konjac, NC_046702 (Hu et al. 2019); Amorphophallus konjac, OR438675 (Li et al. 2024); Amorphophallus albus, NC_067990 (Shan et al. 2023); Amorphophallus titanium, NC_056329 (Henriquez et al. 2021); Amorphophallus yunnanensis, OR400247 (Yin and Gao 2023a); Amorphophallus coaetaneus, NC_072945 (Gao et al. 2023); Caladium humboldtii, NC068800 (reference not available); Xanthosoma helleborifolium, NC_051873 (reference not available); Syngonium angustatum, MN046894 (Henriquez et al. 2020); Alocasia fornicata, MN636779 (reference not available); Leucocasia gigantea, NC_060475 (reference not available); Steudnera colocasiifolia, NC_051952 (reference not available); Arisaema franchetianum, MN046885 (Henriquez et al. 2020); Pinellia pedatisecta, MN046890 (Henriquez et al. 2020); Typhonium blumei, MT872311 (Low et al. 2021); Pistia stratiotes, NC_048522 (Quan and Chen 2020); Spirodela polyrhiza, MN419335 (reference not available).