Here's the front and back covers of a brand, spanking new book about plant diversity. Armstrong writes OK and he knows his stuff pretty well, in my opinion. Most importantly this book wasn't written for botanists, it was written for everyone else who might be interested in learning more about the history of plants, about plant diversity, a subject that isn't known well outside of botanical circles. Plant diversity usually is presented in textbooks as a group by group plant menagerie focusing on reproductive cycles and the associated jargon. Most importantly How the Earth Turned Green (Chicago University Press) wasn't written like a textbook so plant diversity could be presented in an interesting manner. TPP gives this book his endorsement, and he didn't even get a free copy for saying so.