The Library has both print books and ebooks.
Searching EOLAS will find both print and ebooks.
However, as you gain experience in using the library, you may also want to try searching for print books in the Library Catalogue and for eBooks in one of the Library ebook databases.
Includes:
GENERAL KEY TO FAMILIES OR GENERA
KEY TO TREES, LARGE SHRUBS AND CLIMBERS IN WINTER
AUTHORSHIP OF FAMILIES
DESCRIPTIONS OF FAMILIES, GENERA AND SPECIES