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Variation in the ISC among 16 genets (maternal lines) of S. carolinense. The values of ISC were estimated using two methods: seed set counts (solid diamonds) and pollen tube growth (open squares). Three groups can be distinguished: most genets are strongly self-incompatible (ISC < 0.2). Genets A6 and A7 consistently show intermediate levels of self-compatibility (0.2 < ISC < 0.6); genet A5 seems to be highly self-compatible (ISC >> 0.6).
