Database
Global
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Global Biodiversity Information Facility (GBIF) - an international network and research infrastructure for species occurrence data
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Plant trait database (TRY) - a network of vegetation scientists providing free and open access to plant trait data
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National Plant Germplasm System (NPGS) - a database of economically important plants, managed by the United States Department of Agriculture (USDA)
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Global Register of Introduced and Invasive Species (GRIIS) - a compilation of annotated and verified country-wise inventories of introduced and invasive species, hosted by IUCN SSC Invasive Species Specialist Group
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Global Invasive Species Database (GISD) - a free, online searchable source of information about alien and invasive species
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Plants of the World Online (POWO) - an online global resource of Kew's botanical knowledge
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The Plant List (TPL) - a comprehensive working list of all known plant species (especially Vascular plants and Bryophytes)
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International Plant Names Index (IPNI) - nomenclatural information for the scientific names of Vascular Plants
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World Flora Online (WFO) - an open-access, Web-based compendium of the world’s plant species
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Invasive Species Compendium (ISC) - a resource of science-based information to support decision-making in invasive species management worldwide
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Tropicos - nomenclatural, bibliographic, and specimen data accumulated in Missouri Botanical Garden's electronic databases; nearly 1.3 million scientific names and over 4.4 million specimen records
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World Checklist of Selected Plant Families (WCSP) - to search for all the scientific names of a particular plant, or the areas of the world in which it grows
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Global Climate Data - a set of global climate layers that can be used for mapping and spatial modelling
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Paleoclimate data - a database of standard bioclimatic variables for different paleoclimate simulations
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Spatial data - GADM, DIVA-GIS (free spatial data, e.g. administrative boundaries, for mapping and modelling)
Regional (India)
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Flowers of India (information about all the flowers found in India, with their common names, especially in Indian languages, pictures and habitat)
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Indian Medicinal Plants Database (This database incorporates 7263 botanical names, more than 1,50,000 vernacular names in ten different Indian languages & more than 5000 authentic images of Indian medicinal plants duly linked to the specific botanical entities)
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Flora of Peninsular India (A great wealth of valuable botanical information on the Indian peninsular flora)
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eflora of India (Database of Indian Plants- developed by the members of Efloraofindia Google Group)