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Herbarium Websites of Interest

MOBOT
A strictly hierarchical account of all flowering plants families. Shows a somewhat conservative view of evolutionary relationships.
USDA PLANTS Database
A single source of information about plants of the U.S. and its territories. The PLANTS Database includes names, identification information, species abstracts, distributional maps, and crop information.
International Plant Names Index (IPNI)
This website lets you look up the authorities of any scientific plant name.
TROPICOS
This site provides access to the Missouri Botanical Garden's VAST (VAScular Tropicos) nomenclatural database and associated authority files.
Botanary
A Dave's Garden index to the meanings of many botanical words and names.
Harvard Univerity Herbaria's Botanical Authorities.
This page lets you search for information about the namers of plants.
Integrated Taxonomic Information System
Athenic Systems TreeGuide
GRIN Taxonomy
Index Herbariorum
Herbaria of the World, compiled by the New York Botanical Garden.
GBIF
Global Biodiversity Information Facility: almost 200 herbaria joined together in a huge database