Abstract
The two earlier papers in this series (Vasek, 1964, 1965) indicated that Clarkia exilis and C. unguiculata have outcrossing frequencies of about 45% and 96% respectively. Each estimate was based on an experiment in one natural population. Because the flower structure of C. unguiculata obviously ensures a high frequency of outcrossing (Vasek, 1965), the estimate of 96% (or essentially 100%) outcrossing in this species may be accepted with considerable confidence. In contrast, the flower structure of C. exilis provides a capability for self fertilization, suggesting that considerable variation from the estimated outcrossing frequency of about 45% may occur under different conditions. Furthermore, the estimate in C. exilis was derived from a population with a very low frequency of the dominant gene tested. Consequently, several questions arise concerning outcrossing in C. exilis. Does outcrossing frequency vary from population to population? Do estimates of outcrossing vary depending on which gene is utilized in making the estimate? Does outcrossing frequency depend on the frequency of the test gene?
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