Plant Systematics and Evolution

, Volume 139, Issue 1, pp 77–94

Breeding systems and hybridization inPetrorhagia sect.Kohlrauschia (Caryophyllaceae)

  • Sandra M. Thomas
  • B. G. Murray

DOI: 10.1007/BF00983923

Cite this article as:
Thomas, S.M. & Murray, B.G. Pl Syst Evol (1981) 139: 77. doi:10.1007/BF00983923


In the diploid speciesP. prolifera, the evolution of autogamy has resulted in the presence of distinct selfing and outcrossing races. The change in breeding system toward autogamy is associated with a reduction in the size of floral features and a lower pollen production. The outbreeding populations have only been found in Greece, while the selfing populations have colonized much of Europe. The two races appear to be reproductively isolated from one another. —Petrorhagia sect.Kohlrauschia contains four species.P. glumacea is outbreeding and shows unilateral incompatibility with the small-flowered race ofP. prolifera and interfertility with the large-flowered race; althoughP. glumacea is sympatric with the large-flowered race, they do not appear to hybridize in the wild. Amongst the allopatric species, internal breeding barriers are also found. These may take the form of hybrid sterility or seed incompatibility.P. velutina is autogamous and reproductively isolated from all the other species of the section regardless of whether they are sympatric or allopatric. It is suggested that the evolution of autogamy has been an important factor in the spread ofP. velutina, the tetraploidP. nanteuilii, and the small-flowered race ofP. prolifera in Europe.

Key words

Caryophyllaceae Petrorhagia prolifera P. velutina P. glumacea P. nantueuilii Floral morphology breeding systems hybridization reproductive isolation 

Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • Sandra M. Thomas
    • 1
  • B. G. Murray
    • 2
  1. 1.Department of Biological SciencesGoldsmiths' College, University of LondonLondonUK
  2. 2.Department of Botany and BiochemistryWestfield College, University of LondonLondonUK

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