- Albion College Vascular Plant Image Gallery - Taxonomically arranged images and summaries of family characteristics.
- Atlas of the Flora of New England - Continuing project with annotated checklists of pteridophytes, gymnosperms, and most monocots, with links to dot maps for each taxon.
- Botanical Word Meanings and Name Derivations - References on California plant names, meanings and derivations from Latin and Greek roots, with biographical information on western botanists and collectors.
- CalFlora Database - Searchable database all 8375 currently recognized vascular plants in California, including 20000 photographs.
- Caudiciforms - Information and photos of many species of caudiciforms - plants with thickened bases.
- Dictionary of Botanical Epithets - Glossary of Latin terms used in species names, from abbreviatulus to yunnanensis.
- Digital Flora of Texas - Vascular Plant Image Library - Large collection of photographs, arranged by family.
- Discover Life - Plantae - Checklists, images, maps, and identification guides.
- E-Flora BC - Electronic atlas project for the plants of British Columbia, covering life forms from vascular plants to algae, and topics from identification to scientific collections.
- Flora of Europe - Photographic herbarium organized by plant family and genus, with botanical descriptions and photos. Personal project, with about 60 families represented.
- Flora of Hokkaido - Distribution maps of vascular plants of Hokkaido, Japan.
- FloraBase - The Flora of Western Australia - Authoritative scientific information on 12,000 taxa in Western Australia, including maps, images, descriptions, specimen, and nomenclatural information. Requires registration.
- Forestry Images - Plants - Small collection of plant imagery, from University of Georgia.
- Glossary of Roots of Botanical Names - Meanings of over 1000 root words used in scientific names of plants.
- Hawaiian Native Plant Genera - Images of hundreds of species of ferns, fern allies, and flowering plants, arranged by genus.
- Illustrated Flora of North Central Texas - Information including keys, descriptions and illustrations of species available in Adobe pdf format by Shinners and Mahler.
- Index Nominum Genericorum - A collaborative project of the International Association for Plant Taxonomy and the Smithsonian Institution, providing a compilation of generic names published for all organisms covered by the International Code of Botanical Nomenclature.
- International Plant Names Index - Database of the names and associated basic bibliographical details of all seed plants.
- Introduction to the Green Kingdom - Brief introduction to the plant kingdom with links to further information.
- Kew Record of Taxonomic Literature - Database of references to publications on the taxonomy of flowering plants, gymnosperms, and ferns.
- Kingdom: Plantae - Deb Schwartz's personal site with a growing directory of the hierarchy from Kingdom down to species. Includes descriptive pages on selected species.
- Land Plants Online - Southern Illinois University's guide to the taxonomic and evolutionary relations among terrestrial plants, with extensive links to other resources.
- Names in Current Use for Extant Plant Genera - International Association for Plant Taxonomy searchable database.
- National Plant Data Center - Responsible for the PLANTS database, which focuses on the vascular and non-vascular plants of the United States and its territories, including checklists, species abstracts, distribution data, crop information, plants symbols and plant growth data.
- Natural Perspective: Plant Kingdom - Introduction to the Plant Kingdom with information on some of the divisions which make up this group.
- The Oldest Land Plants - Introduction to the first land plants, known from fossils.
- Plant Resources Center of the University of Texas at Austin - Herbarium holding the world's largest collection of Texas plant specimens. Site offers history, and information about staff and facility use.
- Plants For A Future - Information about a wide range of edible or otherwise useful plants, sorted by names and potential uses. Includes a searchable database.
- PLANTS National Database - Online USDA database of information, images, and links on plants in the USA, including crops and invasives. Search by name, geographic distribution, or other characteristics.
- Synonymized Checklist of the Vascular Flora of the United States - Full text index of the 1998 version of the Biota of North America Program's checklist.
- University of Manchester: British Flowering Plants - Searchable, illustrated collection.
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