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. 2018 Dec 24;124(1):1–14. doi: 10.1093/aob/mcy233

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© The Author(s) 2018. Published by Oxford University Press on behalf of the Annals of Botany Company.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 7. — Principal component analysis of stem anatomical characters, mean annual precipitation and P₅₀ on the first two axes. P_LIG = proportion of lignified area per total stem area as observed in a cross-section; P_FWF_X = proportion of xylem fibre wall area per fibre area as observed in a cross-section; P_R = mean annual precipitation; T_WD_V = thickness-to-span ratio of vessels; P₅₀ = pressure inducing 50 % loss of hydraulic conductivity; D_H = hydraulically weighted vessel diameter; T_PM = thickness of intervessel pit membrane. Circles represent individuals of H. incana from humid (filled) and dry (open) sampling sites, while triangles refer to individuals of S. orientale from the humid (filled) and dry (open) sites. The squares represent the other individuals of Brassicaceae and Asteraceae studied.