The third book in a series of natural science handbooks for Alaskan students focuses on Alaskan plantlife. The first chapter, on trees, gives general information about trees and explains how to identify and locate trees in the three main Alaskan tree families: pine, willow, and birch. The second chapter, on plants, describes 14 kinds of edible plants and 3 poisonous plants growing in Alaska. It also includes descriptions of 12 wildflowers common to the state. The final chapter details the threat to Alaska of ecological imbalances and pollution of the air, soil, water, and land. Each chapter contains a list of student exercises and activities, review questions, and teachers' notes including learning objectives. A 42-item bibliography completes the volume. (SB)