- Be Nice to Nettles Week
 - Site promoting National Nettles week, 19th to 28th May 2004. Features a wealth of information on the humble, and stingy, nettle. - Botany.com
- Includes an encyclopedia of flowers and plants indexed by botanical and common name as well as links to associations and societies.
- Butterflies and Plants: Partners in Evolution
- Discover how natural selection has shaped animals and plants together through their ancient and persistent dependencies, and defences with one another in this Smithsonian exhibit.
- Centres of Plant Diversity: The Americas
- Part of a three-volume work that contains accounts of nearly 250 major sites for conservation of plant diversity worldwide.
- Complete Guide to Growing Sunflowers
- Provides descriptions of different species, cultivation information, and fun facts.
- Database of Herbaceous Vegetation Responses to Elevated Atmospheric CO2
- Contributed by Michael H. Jones and Peter S. Curtis.
- DavesGarden: Plants Database
- PlantFiles is an identification database with over 150,000 plants. PlantFiles entries come with cultivation information and pictures supplied by member gardeners from around the world.
- Enchanted Learning: Plants
- Includes an illustrated plant dictionary for children, Arbor Day crafts, colouring pages, and quizzes related to plants and flowers.
- FhF Grasses
- Dedicated to ornamental grasses.
- Floral Images
- Showcases pictures of garden and wild flowers from the U.K. and Ireland.
- Floridata 2.0
- Offers a photographic encyclopedia of landscape plants and serves as an online plant and nature reference and a gardening marketplace.
- Flowers in Ultraviolet
- Gallery of colour, ultraviolet, and infrared photographs capturing a variety of flowers spectral signatures. Images are arranged by plant Family.
- Flowers.vg
- Offers a large selection of flower and plant pictures and desktop wallpapers including roses, daisies, lilies, sunflowers, daffodils, tulips, venus fly traps, cacti, and others.
- Genera Zingiberarum
- Classification and treatise of the Genera of the Superorder Zingiberanae, including Bananas, Heliconias, Gingers, and Relatives.
- Grass Genera of the World
- Comprises an interactive identification and information retrieval system using the programme Intkey, descriptions, illustrations, references, and other subsidiary material.
- Great Plant Escape
- Elementary programme for 4th and 5th grade students designed to introduce them to plant science and increase their understanding of how foods grow.
- HortiPlex
- Plant database containing images, gardening information, nomenclature data, and links.
- Introduction to the Anthophyta
- Information about the Anthophyta, or flowering plants, the largest group of plants. Includes links to more specific flowering plant groups.
- Introduction to the Plantae
- Information on mosses, ferns, conifers and flowering plants with additional resources on paleobotany and plant systematics.
- INVADERS Database System
- Comprehensive database of exotic plant names, distribution records, and regulatory information for the northwestern United States.
- Leaf Identification
- Instructional unit from the Department of Horticulture at Penn State University. Includes information on identifying leaves by structure, shape, groupings, margins, and arrangement.
- Medicinal and Poisonous Plant Databases
- Offers links to articles and monographs on specific plants, medical herbalism, and pharmacognosy.
- Methods in Plant Histology
- Containing research techniques and methodology regarding plant histology, or the study of the tissue structure of plants.
- NATURE: The Seedy Side of Plants
- Discover the methods seeds use to travel, how they adapt to new environments, and how genetic engineering is being used to alter the natural seed production of plants.
- New Plant Page
- Lists new and rare plant genera. Includes original cultivar checklists and horticultural monographs.
- Noble Foundation Plant Image Gallery: Grasses & Grasslike Plants
- Indexed by common and scientific name.
- Official State Flowers
- Lists the state flowers (with colour photographs) by their common and scientific names.
- Parasitic Plant Connection, The
- Database of information about parasitic plants, including articles, images, terminology, specialists, and links to other resources.
- Penstemon
- Information and pictures of this native North American plant genus.
- Plant Image Gallery
- Features a gallery of plants from all over the world.
- Plants at Work
- National information campaign working in conjunction with the industry to inform professionals in the public about the numerous benefits of interior plants.
- PLANTS Database
- USDA provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories.
- Plants for a Future
- Collection of leaflets about edible and other useful plants, including plants for lighting, fibre, soaps, oils, and information on permaculture and perennial plants.
- Plants Magazine
- Featuring new rare and unusual garden plants from around the world.
- Plants-In-Motion
- Watch movies of plants growing and learn interesting facts about plants of several types.
- S-weeds
- A poetic journey among the Swedish weeds consisting of daily haikus and photo entries of individual weeds.
- Shamrock, The
- Symbolism and history of the three-leafed clover native to Ireland.
- Solanaceae
- Provides characteristics, index of subfamilies, species of the month, and references about this plant family.
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