In case anybody else was puzzled, C4 grasses are those that "use the C4 carbon fixation pathway to increase their photosynthetic efficiency by reducing or suppr

In case anybody else was puzzled, C4 grasses are those that "use the C4 carbon fixation pathway to increase their photosynthetic efficiency by reducing or suppressing photorespiration, which mainly occurs under low atmospheric CO2 concentration, high light, high temperature, drought, and salinity." [1] https://en.wikipedia.org/wiki/List_of_C4_plants https://en.wikipedia.org/wiki/List_of_C4_plants