Univ. of North Carolina at Chapel Hill provides a searchable reference guide to North American biota, encompassing over 80,000 accepted taxa.

National Geographic Online presents a virtual tour of North American forests. Download Shockwave or QuickTime VR to experience the graphics.

Peruse fact sheets for plants classified as moncots, eudicots and dicots. Features the Cronquist, Takhtajan and Thorne classification systems.

Chronicles the history and evolution of plants from the appearance of algae billions of years ago to genetic engineering in the 20th century.

Search by keyword or browse fact sheets concerning trees, shrubs, vines, ground covers, perennials, annuals, house plants, insects and diseases.

Directory of plant-related links includes sites offering gardening advice, a glossary of terms, pictures, and resources.

Learn about the different plant parts, how they grow, and how they interact with people and animals. Includes student web activities.

Presents resources on abiotic, or plant environmental stresses, including drought, excessive heat and cold, salinity, soil mineral deficiency, and soil mineral toxicity.

Contains a list of accepted family names for vascular plants. Provided by Prof. James Reveal of the University of Maryland.