Start with high-confidence botany & plant science books, then narrow by subgenre or adjacent topics.
Weeds
Richard Mabey
The Light Eaters
Zoë Schlanger
A Peterson Field Guide to Edible Wild Plants
Roger Tory Peterson
Understanding Orchids
William Cullina
Orchid Fever
Eric Hansen
Wildflowers
Chris Thorogood
The Scent of Scandal
Craig Pittman
Victorian Nightshades
Elizabeth A. Campbell
Identifying Wood
R. Bruce Hoadley
Braiding Sweetgrass
Robin Wall Kimmerer
Edible Plants
Jimmy Fike
The Hidden Life of Trees
Peter Wohlleben, Jane Billinghurst
ORCHID
David A. Berry
Trees
Kelsey Oseid