Angiosperm Phylogeny - Phylogenetic trees, technical descriptions of all orders and families, references, and links. By Peter Stevens of the Missouri Botanical Garden.
Angiosperms - Photographs and information on flowering plants from the Tree of Life web project.
Chilean Flora - On-line herbarium of over 1100 Chilean plants, articles on Chilean flora, and seeds and seedlings of Chilean plants for sale.
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.
