These handy, accurate, and easily used keys to fruit and twig identification are the only guides of their sort with photographs -- over 350 of them, of nearly every twig and fruit described -- making them especially valuable to the novice.
The fruit key (dealing with both deciduous trees and evergreens) begins with a concise introduction, explaining simply and lucidly the process of seeding, and identifying the various organs involved: the cones and flowers, and their component parts and variations. Next the various types of fruits are described -- drupe, berry, pome, legume, follicle,...