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Floret nectar volume and concentration (A, B), floret number per capitulum (C), capitulum number per plant (D), plant number per open-top chamber (OTC) (E) and proportion of flowering plants (F) for warmed and ambient OTCs in 2012 and 2013. ***P < 0.001; **P < 0.01; *P < 0.05 (one-way ANOVA).
