As Heard on The Daily Gardener Podcast:
Plant Identification Terminology by James G. Harrison
This book came out in 2001, and the subtitle is An Illustrated Glossary.
Well, to me, this book is an oldie, but goodie; I first bought my copy of this book back in 2013.
This book aims to help you understand the terms used in plant identification, keys, and descriptions - and it also provides definitions for almost 3,000 words.
Now, if you're looking to improve your grasp of plant identification terminology, this book will be an invaluable reference.
And just as a heads up. there are around 30 used copies that are reasonably priced on Amazon. But of course, they're not going to last forever, so if you're interested in this book, don't wait to get a copy. (After those used copies are gone, then the next lowest price is around $200.)
This book is 216 pages of exactly what it says it is: plant identification, terminology - and I should mention that there are also helpful illustrations.
You can get a copy of Plant Identification Terminology by James G. Harrison and support the show using the Amazon Link in today's Show Notes for around $12
SI HORTUM IN HORTORIA PODCASTA IN BIBLIOTEHCA HABES, NIHIL DEERIT.