To avoid resource waste caused by repeated sampling, we accessed the European Nucleotide Archive (ENA) (https://www.ncbi.nlm.nih.gov/sra) database and obtained WGS (whole-genome sequencing) data for 9 species with a complete plastome assembly. They all come from the Kew Tree of Life project [61 (link)], which is freely available for use. Furthermore, we collected fresh stem samples of 26 cactuses from flower markets in Chongqing, Guangxi, and Fujian in September 2020. All specimens were deposited in the Herbarium of Southwest University, Chongqing. Two previously reported species (Carnegiea gigantea, NC_027618.1; Lophocereus schottii, NC_041727.1) were also included in our analysis. The details of the plant samples used for plastome assembly are given in Table S5.
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