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REFERENCES

  • Balkovsky, B. E. (1960). Methods of botanical research; a polytomic numerical coding system for the identification of plants. Bot. Zh., 45, 64.
  • Clapham, A. R., Tutin, T. G. & Warburg, E. F. (1952). Flora of the British Isles. Cambridge University Press.
  • Ross-Craig, S. (1948). Drawings of British Plants. Bell, London .