Biological invasion of native plant communities is a high-priority problem in the field of environmental management. Resource managers, biologists, and all those involved in plant communities must consider ecological interactions when assessing both the effects of plant invasion and the long-term effects of management. Sections of the book cover human perceptions of invading plants, assessment of ecological interactions, direct management, and regulation and advocacy. It also includes an appendix with descriptive data for many of the worst weeds.

From the National Wildlife Federation(R) comes the most up-to-date, all-photographic field guide to North American trees. The Jeffrey Pine, Coconut Palm, Staghorn Sumac, and Western Hemlock: this single, portable volume features these, plus more than 700 other tree species and varieties, with special emphasis on their leaves, bark, fruits, and flowers. More than 2,000 stunning images show these trees in their natural habitats. Other features include: a unique identification tip for each tree; range maps showing distribution in North America; How to Identify a Tree section; a detailed glossary of tree parts and leaf, fruit, flower, and bark types; essays on ecology, conservation, and North America's important forest types; plus a complex species and quick-flip indexes. The guide's unique waterproof cover makes it especially valuable for use in the field.

Biological invasion of native plant communities is a high-priority problem in the field of environmental management. Resource managers, biologists, and all those involved in plant communities must consider ecological interactions when assessing both the effects of plant invasion and the long-term effects of management. Sections of the book cover human perceptions of invading plants, assessment of ecological interactions, direct management, and regulation and advocacy. It also includes an appendix with descriptive data for many of the worst weeds.