Carex Beyond Taxonomy: Integrating Genomic Architecture, Life History, and Ecosystem Function

Carex is among the most species-rich genera of angiosperms and plays important ecological roles in wetlands, alpine regions, and temperate ecosystems worldwide. However, research on this genus has long been challenged by pronounced phenotypic plasticity, reduced floral morphology, frequent hybridization, and complex chromosomal evolution. Although recent advances in molecular phylogenetics, comparative genomics, reproductive biology, and ecophysiology have substantially expanded the knowledge of Carex, these findings remain fragmented across disciplines. Here, we synthesize current evidence on Carex taxonomy and phylogeny, genomic and karyotypic evolution, reproductive and life history strategies, abiotic stress responses, ecosystem functions, and bioresource potential within a cross-scale framework. This review emphasizes how genomic architecture, life history variation, and ecophysiological adaptation jointly shape species diversification and ecosystem functioning, while clarifying their implications for habitat restoration and the sustainable use of Carex resources. Finally, we identify key priorities for future research, including improved phylogenomic resolution, comparative functional studies, climate-resilience assessment, and germplasm conservation and sustainable use.