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. 2018 Jun 27;9:874. doi: 10.3389/fpls.2018.00874

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Copyright © 2018 Takkis, Tscheulin and Petanidou.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Comparison of optimal temperatures to past monthly average temperatures and future projections by 2100 (IPCC, 2007, 2013) in six species. Flowering month of each species is noted in the parentheses. (A) Nectar volume per flower, (B) sugar content per flower, (C) sugar content per plant, (D) the number of flowers per plant. For Lavandula stoechas, sugar content per flower (graph B) had a linear relationship to temperature, therefore the optimal temperature could not be calculated.