Just in case, in my site you can find a page directing to my scholar texts (in Portuguese), one of them dealing with the practical use of Arabidopsis thaliana for teaching.
At the SeaWIFS project satellite images page one can find beautiful depictions of the photosynthetic activity in land and sea.
And check out the Global Diversity Map for vascular plants by the Biomaps Project at the Bonn University Botanical Institute.
Online Vegetation and Plant Distribution Maps. A Cartography links site is also available.
Internet Directory for Botany a good jump site (lots of links). See for example the vascular plants page.
GRIN taxonomy, excellent for looking up each species.
Vascular plant family nomenclature, by James Reveal.
Families of Flowering Plants Watson & Dalwitz.
The Treezilla project (phylogenetic reconstruction for seed plant families).
Plant family ID.
Species 2000, one of the mirrors of the main page, some with useful checklists like the one in fishbase.
Example of a query on Plants National Database, another on Inference find, and another on fishbase dynamic checklist.
WWW Virtual Library: Botany
National (US) Plants Database
Internet Resources for Botany and Plant Ecology one of the links pages by Ann Throckmorton, Westminster College, Pennsylvania.
Flowering Plant Gateway gigantic site.
Search names from Kew.
Taxonomy of Flowering Plants.
Univ Catania Dicots (Italy).
Phylum, Magnoliophyta and Family directories, Univ. West Madison.
Plant fossils and evolution.
Vascular Plant Families and Genera at Kew.
Example of search at University of Bonn Botanik Department.
Seed plants at Berkeley, at Cornell.
Quercus systems, Quercus at TreeWeb and Quercus suber Network.
Phylum Magnoliophyta Good links list.
The Herbweb a list for useful plants.
The Herbage Botanical Database focuses on ethnobotanical uses, contains over 29,000 species.
Euro+Med Plant Database
Database of Plant Databases.
Global, Alleles list, Species list, same, non US, BigFiles, TreeWeb
Images and Descriptions of Flowering Plant Families.
Image Gallery for Vascular Plants, searchable.
Angiosperm images from Albion College.
The Royal Horticultural Society Site, for example its page dedicated to trees and shrubs.
A site on agricultural history
Famine foods by Newcrop.
FAO Forestry Department
Le Bois (France)
A forest genetics laboratory in France (INRA)
Keslick & Son, Modern Arboriculture & LandscapeMaintenance, highly watchful on everything that relates to environmental issues in tree growth and maintenance.
A Compendium of plants for exotic gardens.
Sierra Nevada Edible Plants (by family)
Fauna e flora do montado (Portugal)
Biomedicine-oriented users have all reasons to become members of the BioMedNet.
PubMed has the largest biomedical literature database online. It forms the basis for searching for so-called Alternative Medicine.
The old UnCover Reveal resource has teamed with Ingenta to make an excellent reference resource.
The Biochemical Genetics site from the University of California at San Diego is an excelent reference in the field.
To have your thesis or other communications published online, connect to the Yellow Index for this and for much more.The Kluwer Academic Publishing Information Service is worth the visit.
MEKA online identification programme.