• Angiosperm Phylogeny - Phylogenetic trees, technical descriptions of all orders and families, references, and links. By Peter Stevens of the Missouri Botanical Garden.
• Angiosperms Image Gallery - Extensive collection, organized by family.
• The Families of Flowering Plants - A taxonomical database with descriptions and illustrations of each family, and an interactive key to families.
• Flowering Plant Gateway - 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.
• OSU Seed Biology Program - SeedID Index - Photographs of the seeds of selected plants.

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