Θ Science: Biology: Flora_and_Fauna: Plantae: Magnoliophyta

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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.
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.