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Observed heterozygosity for subspecies of E. tithymaloides in the Caribbean. Subspecies tithymaloides Mex-C.Am includes Guanica (see the electronic supplementary material); padifolia includes St Croix. Correlation is significant at α = 0.05 (p = 0.01423). Excluding Vieques from the analysis yields a model significant at α = 0.1 (y = 1.0066x − 0.1618, R2 = 0.5391, p = 0.09656).
