Phylogeny, evolution and ecological speciation analyses of <i>Imperata</i> (Poaceae: Andropogoneae) in the Neotropics

Imperata is a ubiquitous grass genus of the tribe Andropogoneae (Poaceae), distributed throughout world. Previous systematic studies had established that encompasses nine species although no phylogenetic molecular are available in which all taxa have been included. The American continent has largest number species, encouraging research into how these evolved. Here we present analysis based on three plastids (ndhF, trnL-F, and atpB-rbcL) one nuclear (ITS) marker cover most extensive geographic distribution genus. We use this phylogeny to test monophyly within Andropogoneae, analyze infrageneric relationships genus, estimate lineage divergence time. Additionally, ecological niche models (ENM) lineages presented recognize abiotic factors constraint their potential allow an understanding drivers for diversification. Our results yield fully supported tree where confirmed exposes existence two clades, encompassing five other those rest In parallel, dating, ENM, speciation tests suggest underwent during Quaternary associated with conservatism divergence. contribute both taxonomic evolutionary knowledge grasses, also biological diversity Neotropics.