- Flowering Plant Gateway - http://www.csdl.tamu.edu/FLORA/newgate/cronang.htm
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.
- Angiosperm Phylogeny - http://www.mobot.org/MOBOT/Research/APweb/
Phylogenetic trees, technical descriptions of all orders and families, references, and links. By Peter Stevens of the Missouri Botanical Garden.
- Angiosperm Images - http://www.albion.edu/plants/ANGIFAMS.HTM
Extensive collection, organized by family.
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