BREEDING BARRIERS IN SOME SPECIES OF SISYRINCHIUM

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Abstract
Summary: The cytology, breeding structure and relationships of several species of Sisyrinchium are discussed, particular attention being paid to the geographically separated populations of S. bermudiana found in America and Ireland. These are morphologically indentical, but in crossing with a second taxon, with which neither is in contact, they show a physiological difference which may have arisen by the selection in the American population of barriers to interbreeding with a third taxon with which the Irish population has no contact. The situation revealed, suggests a mechanism whereby a barrier to interbreeding could arise between populations or incipient species in non‐contiguous territories.

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