Below is a list of books that explore paleobotany and ancient ecosystems through a story-based approach. There may be others, but these are the main (non-animal) books available from book sellers
How the Earth Turned Green, by Joseph Armstrong
Making Eden, by David Beerling
The Emerald Planet, by David Beerling
The Ghosts of Evolution, by Connie Barlow
Below is an (incomplete) list of youth books that deal with the topic of ancient plants. I'm sure there are many more...
Big Tree, by Brian Selznick
When Plants Took Over the Planet, by Chris Thorogood & Amy Grimes
Below is an (incomplete) list of paleobotany textbooks that many students of the field would possess [apologies to anyone who has been left off the list]
Introduction to Plant Fossils, by Christopher Cleal & Barry Thomas
Paleobotany and the Evolution of Plants, by Wilson Stewart and Gar Rothwell
Paleobotany: The Biology and Evolution of Fossil Plants, by Taylor, Taylor, & Krings
Paleobotany, Paleoecology and Evolution, by Karl Niklas
The Evolution of Plants, by Kathy Willis and Jennifer McElwain
The Origins and Early Diversification of Land Plants, by Paul Kenrick & Peter Crane