American Botanical Council Library of reliable information on medicinal plants
Biblioteca Digital Hispanica National Library of Spain has digitized many natural history and botanical texts
Bibliotheca Antiqua Hundreds of herbals and other classic antiquarian botanical texts
Biodiversity Heritage Library (BHL) A consortium of natural history libraries digitizing the literature of biodiversity.
BPH Online Index of natural science periodical title abbreviations
Classic Herbal Texts Collection of nineteenth and early twentieth century herbal texts
Council on Botanical and Horticultural Libraries, Inc. (CBHL)
DART Europe E-theses Portal Search European theses and dissertations
Digital Library of the Royal Botanic Garden Madrid Books and journals pertaining to Iberian, Latin American and Philippine flora
Early Classics in Biogeography Biodiversity and Ecology
Europeana Search the digital cultural collections of Europe
Gallica hundreds of French botanical works digitized
Gardening Digital Library Hundreds of links to websites and digital resources
German botanical journals 1754-1914 Online Library of German botanical literature
Hathi Trust Shared digital repository with over 4.6 million texts from American universities
Internet Archive Digital Texts Containing dozens of horticulture, landscape and botany classics
Online Books Page Over a million digital books available on the Web
Online Neo-Latin Texts Guide to Renaissance Latin texts online
PubMed National Library of Medicine database of biomedical journal articles back to 1948
Rare Book Room Octavo Digital versions of treasured books from many of the world's great libraries
USDA Pomological Watercolors Over 7500 drawings of fruit and nut varieties registered from 1886-1942
AGRICOLA, National Agricultural Library On-Line Catalog
Archives of American Gardens Photos and records documenting over 6,000 American gardens
ArticleFirst Index of articles from over 16,000 journals from 1990 to the present
ClasePeriodica Index of over 2,700 Latin American journals from 1975 to the present
ECO Full text scholarly journal articles from 5,500 social science and humanities journals
ERIC Educational resources information center
GPO U.S. government publications
Library of Congress Catalogs
LOCATOR, National Library of Medicine Catalog
Microsoft Academic Search Over 36 million publications across a variety of domains updated weekly
OAIster Union catalog of digital resources
PapersFirst Index of over 7 million conference papers from 1993 to the present
Proceedings Index of worldwide conference proceedings from 1993 to the present
Royal Botanic Garden Kew Library Catalogue
Short History of Seed & Nursery Catalogs historical overview of American and European catalogs
WorldCat Dissertations An index to over 8 million dissertations and theses
AlgaeBase Botanical information on terrestrial, marine and freshwater algae
Angiosperm phylogeny Plant evolution systematics textbook
BibliOrchidea Most comprehensive orchid literature bibliography
Botanical Illustration Resources A guide to resources for illustrators, historians, and collectors.
Bryological Glossary Electronic comprehensive glossary of bryological terminology
Checklist of Ferns Ferns and fern allies classified taxonomically
Convention on Biological Diversity United Nations treaty promoting sustainable development
Dictionary of Natural Products The only comprehensive and fully-edited database on natural products.
eFloras.org Floras, checklists, keys, and image galleries for many ongoing floristic projects.
Flora Brasiliensis Largest flora ever published
Flora of Brazil Species List Search for information on all known plant species of Brazil
Fungal Database US National Fungal Collection search names, hosts, literature, specimens
Global Biodiversity Information Facility Offering publications, meeting notices and data sharing software
Glossary of Pollen and Spore Terminology Illustrated glossary explaining structures and features
GrassBase Detailed information about all grass species
Guide to Plant Species published in Seed Lists 1800-1900
Gymnosperm Database Classification, description and ecology of conifers
How to Name and Register a New Cultivar
IDB, The Internet Directory for Botany thousands of botanical websites indexed
Index Fungorum Index of accepted nomenclature for global fungi
Index Herbariorum Directory of herbaria around the world
Index Nominum Algarum Taxonomic names of over 200,000 algae
Index Nominum Genericorum A compilation of the generic names of plants
Index to American Botanical Literature An index to botanical literature of the Americas published since 1995
Interactive plant ID keys State by state interactive keys for grasses, legumes, monocots and gymnosperms
IPNI, International Plant Names Index Standard reference for plant nomenclature
ITIS, Integrated Taxonomic Information System Authoritative taxonomic information on plants, animals, fungi, and microbes.
Kew Bibliographic Databases
Medline US National Library of Medicine life sciences database from 1950 to the present
Native American Ethnobotany Database Foods, medicines, dyes, drugs and fibers all searchable by tribe
Neotropical Flowering Plant Identification Extensive list of digital floras, specimen databases and taxon websites
New York Natural Heritage Program From the NYS Dept of Environmental Conservation
NGA GEOnet Names Server Standardized names for global topography
Phytochemical Database From the USDA search for information on thousands of plant chemicals
Species 2000 (Indexing the world's known Species)
Tree of Life Web Project Collaborative effort to provide biodiversity information
US Board on Geographic Names Standardized names for US geographic nomenclature
Web of Science Search over 9,500 journals across the sciences, social sciences and humanities
World Database of Legumes Over 19,000 taxa described
American Mushrooms An introduction to their variety
BSA Image Collection Botanical Society of America teaching images collection
Carnivorous Plant Database
CATENA, the Digital Archive of Historic Gardens and Landscapes
Forest images USDA project to document silviculture, urban forestry and diseases
MykoWeb Vast array of sites devoted to fungi, mushrooms, and mycology.
Native Plant Database Search for American native plants by state.
Native Wildflowers Image Database
Plant Illustrations Over 25,000 images of published botanical illustrations
Plant Image Collection Over 30,000 images of plant species and habitats
Plant Systematics Over 26,000 images of vascular plants
Pomological Watercolor Collection USDA documents fruit and nut varieties
Rock Garden Plants
USDA Plants Photo Gallery
A Modern Herbal Over 800 herbs described and prescribed.
Acta Horticulturae Full text proceedings of ISHS Symposia and International Horticultural Congress
Algae The US Algal Collection of some 300,000 specimens described.
American Orchid Society Directories for locating and cultivating orchids.
American Public Gardens Association (APGA) Search for statistics on all public gardens in America
Botanic Gardens Conservation International Plant Search Locate rare and threatened plants in cultivation around the world
Center for Aquatic and Invasive Plants Nearly 500 plants described and photographed.
Center for Plant Conservation American conservation resource directory and Guide to the National Endangered Collection.
Checklist of Online Vegetation and Plant Distribution Maps Many interesting historic and contemporary maps.
Cultivar checklist for ornamental plants
Culturally Significant Plants Ethnobotanical resource list from USDA
Find My Roses An online guide to over 31,000 cultivars and their growers.
Flora of New York State search native plants of New York state by county
Garden Guides Handy guides for many kinds of garden procedures, designs and plantings
Go Orchids Find which orchids are endangered near you
Hardiness Zone Map Check your state's hardiness zones
Index of Rainforest related sites Resources on rainforests, sustainable forestry and forest conservation
International Carnivorous Plant Society Species descriptions, cultivars, and photographs.
Introduction to Lichens Basic guide to lichenology.
Introduction to the Fungi Basic introduction to the world of mycology.
IUCN Redlist of Threatened Species Authoritative listings of threatened and endangered plants.
National Gardening Association Wide variety of garden related content for consumers and educators
National Invasive Species Information Center Invasive animal and plant species searchable by geographic location
Natural History: atlases, gazetteers, GIS and maps Extensive list of map resources and geographical names
New York State Urban & Community Forestry Council Resources for tree identification, street trees and urban forestry
NGA Plant Finder Choose plants from many categories to meet your gardening needs
Plant Facts Multimedia horticulture center with dictionary, FAQ's, videos from Ohio State
Plant Information Online Locate plants from over 1,100 North American nurseries
Plant Viruses Online Scientific information on all known plant viruses.
Poisonous Plants Images and information on hundreds of known plant poisons and their effects.
Pronunciation Guide for Latin Plant Names Hear the Latin pronunciation of thousands of plant names
RHS Plant Selector Over 70,000 plant species described, photographed and indexed
Seaweed Site Information on the types, uses and classification of marine algae
Silvics of North America USDA guide to the trees of North America
Succulent Plant Page Information on collecting, cultivating, and conserving all manner of succulents.
Tree Encyclopedia Over 450 species of North American trees described and photographed
Twelve Soil Orders Soil maps of US and soil taxonomy database
USDA Plants Database Standardized information about the flowering and non-flowering plants of America.
Virtual Palm Encyclopedia All aspects of palms discussed.
American Association for the Advancement of Science
American Fern Society
American Iris Society
American Society of Plant Taxonomists (ASPT)
ArchiveGrid search archival collections held in museums and libraries worldwide
Association for Tropical Biology & Conservation
Council on Botanical and Horticultural Libraries (CBHL)
Mycological Society of America (MSA)
North American Rock Garden Society (NARGS)
NUCMC National Union Catalog of Manuscript Collections
Organization for Flora Neotropica (OFN)
Repositories of Primary Sources Describing the research holdings of over 5000 sites
Society for Economic Botany (SEB)
Taxonomic Literature 2 Standard reference for plant taxonomic literature
Torrey Botanical Society
Using Archives: A Practical Guide for Researchers