Brief introduction to the plant kingdom with links to further information.
International Association for Plant Taxonomy searchable database.
Introduction to the Plant Kingdom with information on some of the divisions which make up this group.
Searchable database all 8375 currently recognized vascular plants in California, including 20000 photographs.
Introduction to the first land plants, known from fossils.
Authoritative scientific information on 12,000 taxa in Western Australia, including maps, images, descriptions, specimen, and nomenclatural information. Requires registration.
Database of the names and associated basic bibliographical details of all seed plants.
References on California plant names, meanings and derivations from Latin and Greek roots, with biographical information on western botanists and collectors.
Southern Illinois University's guide to the taxonomic and evolutionary relations among terrestrial plants, with extensive links to other resources.
Small collection of plant imagery, from University of Georgia.