The - This basic but nicely organized site offers a vast amount of technical information about flowering plants, some with illustrations. From habit and leaf form to reproductive type and taxonomy, you can find it here. Interesting and easy to navigate. There's also an Alphabetical Index by common or scientific name. Each entry provides detailed information including description, environment, origin, foliage, flowering, fragrant, growing ease, temperature, humidity, lighting needs, soil, watering, photo of plant, and more.
Information is available on identification and control of common house plant pests.
Pathology Internet Guide Book - This is a great place to explore serious sites on plant pathology, applied entomology, and related fields, with more than 1000 reviewed and annotated resources listed. From the College of Veterinary Medicine and Biomedical Sciences at Colorado State University. An identification key and illustrated glossary are included. Their site also contains of glossary of terms and a list of links to other online resources, including one for Sequoia National Park itself. Hazard Tree Web, The - publications and articles dedicated to how to manage defective trees, particularly in an urban setting.