The OneZoom website has just released a wonderful exploration of the taxonomic linkages and evolutionary history of plant life. It is a unique tool for diving in and understanding the linkages between species, and simply understanding how the complexity of variation of plant families fits together into a single evolutionary jigsaw. The plants tool can be found here: http://www.onezoom.org/plants.htm
It is well worth a play play around with.
Previously they have produced similar analyses for vertebrates, which can be found here: http://www.onezoom.org
Yadvinder Malhi is an ecosytem ecologist and Professor of Ecosystem Science at Oxford University