French researchers used 'resurrection ecology' to compare 2012 pansies with plants from twenty years earlier to see the evolutionary changes in the flowers over time.
You can read the blog post at https://botany.one/2022/08/pansies-undergo-high-speed-evolution-when-pollinators-disappear/
You can read the original research at https://doi.org/10.1002/ajb2.16028