Data for: Historical floras reflect broad shifts in flowering phenology in response to a warming climate

The data set contains months of flowering from 11 guides to the Swedish flora published over a period of 220 years (1798-2018), focussing on 241 plant species (approximately 8% of the Swedish flora). These species were a combination of randomly-selected common and widespread species (n=199) and species for which the species’ Swedish or binomial scientific name indicates that it is related to flowering phenology, or are species for which the public is encouraged to report data for the Swedish phenology network (n=42). These data were used to test whether broad changes in flowering phenology (start, cessation and length) over time and in response to climate warming were detectable from these historical sources.