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Boxplots of centroid size variation of (a) bracts and (b) leaves in a latitudinal gradient across 14 localities. Vriesea taritubensis var. brevisepala in blue, V. taritubensis var. taritubensis in green, Vriesea taritubensis var. patens in yellow and V. incurvata in red. For localities number see Table S1 in Appendix S2 [Colour figure can be viewed at http://wileyonlinelibrary.com]
