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Frequency distributions of mean shoot sodium (Na) concentrations in (a) 334 species from 35 angiosperm orders and (b) 61 species from 10 Caryophyllales families, grown hydroponically in a nonsaline solution. The solid line indicates the normal (mean = 0.393, SD = 0.185 mg Na g−1 DM, n = 42 species) distribution fitted to the data from the 42 Caryophyllales species with the smallest shoot Na concentrations.
