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Cronquist, A. (1988). The Evolution and Classification of Flowering Plants second edition. The New York Botanical Garden, New York. 555 pp. ISBN 0-89327-332-5.
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    Families of Flowering Plants Families of Flowering Plants - Watson & Dallwitz
    Angiosperm Phylogeny Web Angiosperm Phylogeny Web - Stevens
    Tree of Life Tree of Life - Maddison     		Functions
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