Summary. The assimilation of CO 2 was enhanced in seven plant species by44% at 30 ~ in the absence of oxygen, and in three of the species by 85% at 40 ~ .Net assimilation of CO 2 was not significantly greater in the absence of O 2 than itwas in air with leaves of three tropical grasses and of one dicotyledonous species,Amaranthus palmeri. For two species in 30 ~ the enhanced CO 2 assimilation valueswere similar to those of the tropical grasses and of A. palmeri. The absence of O 2did not enhance net CO 2 assimilation in maize even in light of low intensity.
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