Have you read the contents of the book you refer to?
You should not translate the title of this book into any language because it is a reference book and it describes a type of tree that is universally referred to as Sylva Florifera.
Sylva Florifera is the latin genus name of a particular type of evergreen found in the Alps.
But it remains a reference work and the title should not be translated. If it were, no search engine (or card catalogue) would pick it up. A recent edition of the work has extended the title to offer more detail and, possibly, include additional key words to assist in searches.
Sylva Florifera: The Shrubbery Historically and Botanically Treated: With Observations