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SEM images of solid particles on the adaxial (a,c,d,f) and abaxial face (b,e) of leaves of Brickellia veronicifolia (a–c) and Allionia choisyi (d–f) collected from mine residues (a,b,d,e) or non-polluted control site (c,f). Particles = p; glands = g.
