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REFERENCES

  • Babington, C. C. (1904). Manual of British Botany. 9th edn. London .
  • Cain, A. J. (1954). Animal Species and their Evolution. London .
  • Clapham, A. R., Tutin, T. & Warburg, E. F. (1952). Flora of the British Isles. Cambridge .
  • Fedde, F. (1909). Papaveraceae, in Das Pflanzenreich, 4, 104, 36185. Leipzig .
  • Harper, John L. & MCNaughton, I. H. (1960). The inheritance of dormancy in inter- and infra-specific hybrids of Papaver. Heredity (in press).
  • McNaughton, I. H. (1960). D.Phil, thesis, Oxford .
  • McNaughton, I. H. & Harper, John L. (1960a). The comparative biology of closely related species living in the same area. I. External breeding barriers between Papaver species. New Phytol. 59, 1526.
  • McNaughton, I. H. & Harper, John L. (1960b). The comparative biology of closely related species living in the same area. II. Aberrant morphology and a virus-like syndrome in hybrids between Papaver rhoeas L. and P. dubium L. New Phytol. 59, 2741.
  • Sakai, K. & Gotoh, K. (1955). Studies in competition in plants. IV. Competitive ability of F1 hybrids in barley. J. Heredity, 46, 13943.