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Morpho-anatomical features of the four species of Cactaceae studied. Columns ordered from left to right based on the evolutionary trends of the subfamilies within Cactaceae. Superior row: stem morphology in adults. Middle row: wood anatomy, transversal sections. Inferior row: wood macerations, obtained as described in Reyes-Rivera et al. (2017). Fb, fibers; r, rays; v, vessels; VE, vessel elements; WBT, wide-band tracheids. Bars = 150 μm.
