the type locality of the dartford warbler is provence in france. this species probably forms a superspecies with tristram's warbler and this in turn seems close to marmora's warbler and the balearic warbler. altogether, this group of typical warblers bears a resemblance to the wrentit, the only species of sylviidae from the americas. however the wrentit is less closely related to the genus "sylvia" than to the parrotbills. its visual similarity to the dartford warbler group is an example of convergent evolution.