| Introduction to the Green Kingdom - Brief introduction to the plant kingdom with links to further information.
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| Names in Current Use for Extant Plant Genera - International Association for Plant Taxonomy searchable database.
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| Natural Perspective: Plant Kingdom - Introduction to the Plant Kingdom with information on some of the divisions which make up this group.
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| CalFlora Database - provides access to information about all 8375 currently recognized plants in California, including more than 670,000 plant observations and 20,000 photographs.
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| The Oldest Land Plants - Introduction to the first land plants, known from fossils.
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| 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.
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| International Plant Names Index - Database of the names and associated basic bibliographical details of all seed plants.
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| 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.
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| Land Plants Online - Southern Illinois University's guide to the taxonomic and evolutionary relations among terrestrial plants, with extensive links to other resources.
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| Forestry Images - Plants - Small collection of plant imagery, from University of Georgia.
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| USDA PLANTS Database - Plant names, photos, fact sheets, and information on culturally significant plants, noxious and invasive plants, and threatened and endangered plants, with links to thousands of plant-related sites and software tools.
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| 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.
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| Dictionary of Botanical Epithets - Glossary of Latin terms used in species names, from abbreviatulus to yunnanensis.
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| 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.
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| Kingdom: Plantae - A growing directory of the hierarchy, from Kingdom down to species, with common names included, and descriptive pages on selected species.
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| 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.
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| Flora of Hokkaido - Distribution maps of vascular plants of Hokkaido, Japan.
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| Illustrated Flora of North Central Texas - Information including keys, descriptions and illustrations of species available in Adobe pdf format by Shinners and Mahler.
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| Hawaiian Native Plant Genera - Images of hundreds of species of ferns, fern allies, and flowering plants, arranged by genus.
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| Digital Flora of Texas - Vascular Plant Image Library - Large collection of photographs, arranged by family.
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| Albion College Vascular Plant Image Gallery - Taxonomically arranged images and summaries of family characteristics.
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| 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.
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| University of Florida Herbarium (FLAS) - The herbarium and the associated paleobotanical collection have combined holdings of approximately 1/2 million specimens. Includes library search, catalog, and project information.
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| University of Manchester: British Flowering Plants - Searchable, illustrated collection.
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| Glossary of Roots of Botanical Names - Meanings of over 1000 root words used in scientific names of plants.
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| Caudiciforms - Information and photos of many species of caudiciforms - plants with thickened bases.
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| Kew Record of Taxonomic Literature - Database of references to publications on the taxonomy of flowering plants, gymnosperms, and ferns.
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| 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.
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