FLORAL CORRELATES AND FITNESS CONSEQUENCES OF MATING-SYSTEM VARIATIONIN TURNERA-ULMIFOLIA

Outcrossing rates varied from O% to 69% among Jamaican populations of Turnera ulmifolia. A correlation between increasing herkogamy and outc rossing rate occurred among populations. Predictions from sex-allocati on theory were tested by estimating allocation to reproductive functio ns. Significant differences in allocation patterns occurred among popu lations, but they were not correlated with outcrossing rates. The fitn ess consequences of inbreeding were assessed in high- and low-density greenhouse experiments for nine populations with variable outcrossing rates. No evidence for inbreeding depression occurred in early portion s of the life history, but multiplicative fitness functions provide ev idence for inbreeding depression. We tested the prediction that selfin g populations have lower levels of inbreeding depression than outcross ing populations but found no significant correlation.