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Number of stamens per cyathium, pollen grains per cyathium, and pollen viability in male (M) and hermaphrodite (H) cyathia from levels 2 and 3 of the inflorescence, respectively. Values are means ± 95% confidence intervals. Statistically significant differences between male and hermaphrodite are shown (ANOVA test, see the text and Table 2). *** P < 0·001; ns, not significant.
