Genetic diversity and population structure in cities is not consistent among cosmopolitan plant species

Urbanization has led to increasing homogenization of plant communities across cities. However, it is unclear whether these patterns extend to cosmopolitan plant species at the genetic level. We examined genome-wide genetic patterns in six widespread plant species (three Poaceae and three Asteraceae) across five cities in the USA (Boston, Baltimore, Minneapolis-St. Paul, Phoenix, and Los Angeles) using reduced-representation sequencing (quaddRAD flavor of RAD method). Our goals for this study were to assess genetic structure, differentiation, and overall patterns at the genetic level.