Crassulacean Acid Metabolism (CAM)
Plants (usually tropical) that use crassulacean acid metabolism (CAM) for carbon fixation at night. Carbon fixation and Calvin cycle reactions occur in the same cells at different times. Typical CAM plants are succulents in the family Crassulaceae, many cacti, and pineapples. These plants close their stomata during the day and open them at night. Compare C3 plants and C4plants.