THE TAXA OF THE HIGHER PLANTS ABOVE THE RANK OF ORDER

@article{Takhtajan1964THETO,
  title={THE TAXA OF THE HIGHER PLANTS ABOVE THE RANK OF ORDER},
  author={A. Takhtajan},
  journal={Taxon},
  year={1964},
  volume={13},
  pages={160-164}
}
Floral Fusion: The Evolution and Molecular Basis of a Developmental Innovation.
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Numerical and comparative analyses of the modern systems of classification of the flowering plants
TLDR
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