Asteraceae, a family of flowering plants which includes daisies, sunflowers and asters, are the most diverse group of flowering plants in the world. This plant family comprises around 34,000 species, some of which are well-known, such as artichokes, chamomile, dahlias and lettuce. An international research team has now compiled and analyzed a new global database on the distribution and evolutionary history of all Asteraceae species. The researchers found that an unexpectedly high number of evolutionary events -- known as 'speciation' where a new species of plants evolves from a common ancestor -- occurred in the aster family within relatively short time periods on many islands worldwide.