The incompatibility relationships of tristylous species of Oxalis section Ionoxalis of southern Mexico

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Abstract
Ancestral incompatibility relationships occur in populations of tristylous species of Oxalis section Ionoxalis in southern Mexico. Legitimate pollinations lead to substantial seed production; illegitimate pollinations result in complete failure of seed production in most cases. Modifications of trimorphic incompatibility which have led to the evolution of distyly in northern populations of O. alpina were not detected in populations of the southern Mexican species. Rapid genomic changes which have occurred during the northward migration of Oxalis species apparently have been accompanied by the spread of incompatibility modifiers favoring the evolution of distyly.

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