Introduction: Erigeron’s Global Footprint and the Chloroplast View The genus Erigeron, commonly known as fleabanes, comprises hundreds of species distributed across temperate and mountainous regions worldwide. Despite its ecological versatility and near-cosmopolitan range, resolving Erigeron’s evolutionary relationships has been hampered by polyphyly, hybridization, and taxonomic ambiguity, especially among Old World taxa. Chloroplast (cp) genomes, with…