Britannica Educational Publishing 
Closer Look at Plant Classifications, Parts, and Uses [PDF ebook] 

For many of us, plants herald the change of seasons, represent the promise of nourishment, or serve as stunning visual reminders of Earth’s natural beauty. As vital components of nearly every ecosystem on the planet, plants play a fundamental ecological role in the lives of most organisms for their utility in food and clothing production, fuel, shelter, and a host of other activities. Complete with images and diagrams depicting the parts and growth stages of plants, this volume clarifies what defines a plant and introduces readers to the structures of various plants as well as their complex roles within our environment.