The grouping of families and orders is mainly based onHutchinson, 1959, The Families of Flowering Plants (2nd ed.). This is fairly archaic already. One should not pay toomuch attention to this grouping presented here. It isused only because it was the only source, that I haveand which covers all of the world. -- msa
[FFP] Hutchinson, 1959
The Families of Flowering Plants (2nd ed.)
[GMB] Fernald, 1970
Gray's Manual of Botany (8th edition); A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.