Directories and Databases
Aquatic and Wetland Plant Database
Canadian Poisonous Plants Information System
Poisonous Plant Databases
Phytochemical and Ethnobotanical Databases
Plants for the Future   -A Resource and Information Centre for Edible and other useful plants    

Systematics
Flora of North America

Poisonous Plants
Cornell University Poisonous Plants Webpage
Canadian Poisonous Plants Information System
Poisonous Plant Databases

Botany Links
Tropical Plant Database
Botany.com Encyclopedia of Plants

Local Floras
Checklist of the Vascular Plants of Texas
Generic Flora of the Southeastern United States Project

Government
US Forest Service Home Page
Chequamegon-Nicolet National Forest Home Page
USGS-NPS Vegetation Mapping Program products by state
EROS home page
Food and Drug Administration Home Page
 

Organizations
Botanical Society of America
Audubon Online -- National Audubon Society
Home Page of The Nature Conservancy - Help Protect Endangered Species
North Country Trail Association Home Page
American Society of Plant Taxonomists
International Association for Plant Taxonomy
The Nature Conservancy
Organization for Tropical Studies (OTS)

Ecology and Biodiversity
Tree of Life  -A distributed Internet project containing information about phylogeny and biodiversity.
Flora2K-Biodiversity on the Internet
Forestry & Forest Ecology Lab (School of Resource and Environmental Management) Home Page

Miscellaneous
What Are All Those Dead Plants For, Anyway?  -Questions and answers about herbaria
Plant and Gardening History Timeline - from Garden Buildings Direct
The Statistics Home page
Climate Change Tree Atlas of Eastern USA
AltaVista Translation Service
MLA (Modern Language Association) from Adult Learn
Floriography: The Language of Flowers in the Victorian Era
Flower Anatomy For Kids