Introduction to the Green Kingdom - Brief introduction to the plant kingdom with links to further information.

Names in Current Use for Extant Plant Genera - International Association for Plant Taxonomy searchable database.

Gray Card Index - Over 325,000 citations of names of New World vascular plants.

The Oldest Land Plants - Introduction to the first land plants, known from fossils.

Keir's Botanical Photo Archive - Plant photos from across the United States.

International Plant Names Index - Database of the names and associated basic bibliographical details of all seed plants.

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.

Land Plants Online - Southern Illinois University's guide to the taxonomic and evolutionary relations among terrestrial plants, with extensive links to other resources.

Forestry Images - Plants - Small collection of plant imagery, from University of Georgia.

Kew Record Service - Database provides references to all publications on the taxonomy of flowering plants, gymnosperms and ferns. Supplied by the Royal Botanic Gardens, Kew.

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.

CalFlora Database - Searchable database all 8375 currently recognized vascular plants in California, including 20000 photographs.

Dictionary of Botanical Epithets - Glossary of Latin terms used in species names, from abbreviatulus to yunnanensis.

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.

Kingdom: Plantae - A growing directory of the hierarchy, from Kingdom down to species, with common names included, and descriptive pages on selected species.

Flora Europea - Searchable taxanomic database of European plants.

Flora of Hokkaido - Distribution maps of vascular plants of Hokkaido, Japan.

Henry W. Coe State Park - An illustrated list of vascular plants found in the 81,000-acre central Coast Ranges state park in California.

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.

Illustrated Flora of North Central Texas - Information including keys, descriptions and illustrations of species available in Adobe pdf format by Shinners and Mahler.

Albion College Vascular Plant Image Gallery - Taxonomically arranged images and summaries of family characteristics.

Climbers of Guyana - Vegetative key to the climbing plant species of the Mabura Hill region, Guyana, South America.

National Herbarium Nederland - Information about the research themes and training undertaken at the national herbarium of the Netherlands, with links to the three contributary universities.

TerraNatura - Link to the regional natural history museums and maps of floristic regions of Southern Bulgaria and a botanical dictionary.

TAMU Vascular Plant Image Gallery - Large collection of photographs, arranged by family.