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Directory Sites
Various paths for exploration or comparison of four major flowering plant classification systems (Cronquist, Takhtajan, Thorne and the Angiosperm Phylogeny Group system). From Texas A&M University.
www.csdl.tamu.edu
OSU Seed Biology Program - SeedID Index
Photographs of the seeds of selected plants.
www.ag.ohio-state.edu
Phylogenetic trees, technical descriptions of all orders and families, references, and links. By Peter Stevens of the Missouri Botanical Garden.
www.mobot.org
Extensive collection, organized by family.
www.albion.edu
The Families of Flowering Plants
A taxonomical database with descriptions and illustrations of each family, and an interactive key to families.
delta-intkey.com