The Families of Flowering Plants (DELTA - L. Watson and M. J. Dallwitz)
Angiosperm Phylogeny Website (Stevens P.F., Missouri Botanical Garden)
Flowering Vascular Plant Families (University of Hawaii)
USDA - APHIS - Concordance of Family Names
The Flowering Plant Gateway (Cronquist-Takhtajan-Thorne-APG)
The Complete Work of Charles Darwin Online
On The Origin of Species by Means of Natural Selection (Charles Darwin)
Understanding Evolution (Berkeley University of California)
Plant Systematics and Evolution - links (Texas A&M BWG)
Taxonomicon and Systema Naturae 2000
BioLib (Taxonomic tree of plants and animals with photos)
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*systematical and taxonomical databases :: *systematika a taxonomie