These keys were originally published in 1979 in the second edition of ‘Liberian High Forest Trees’. The contents of that book are still highly relevant.Chapter 4 of this book presents a series of keys on foliar characters in trees. A PDF of this chapter can be downloaded by following the link to the left of this text.
This chapter is reproduced from the 1979 edition of Liberian High Forest Trees by kind permission of the author Lex Voorhoeve, and the publishers, Backhuys Biological Books.
The 1965 version of the book may be viewed by following this link http://edepot.wur.nl/187074