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Response of photosynthetic rate to intercellular CO2 concentration in leaves of Calotropis procera and Calotropis gigantea, as indicated, growing in the field during the wet (WS, filled symbols, n = 4) and dry season (DS, open symbols, n = 6). Values are means ± s.e.; standard errors are shown when larger than the symbols. Asterisks indicate significant differences at P < 0·05 of ACO2-sat and carboxylation efficiency between species in the WS.
