During the century since civilized man brought great change to the natural vegetation of Indiana by lumbering and farming, the prairie suffered perhaps more than the forest. Agriculture and drainage modified these habitats greatly. An attempt is therefore made to reconstruct the pattern of the original distribution of grasslands in Indiana. Rohr and Potzger described and discussed three northwestern Indiana prairie counties and the present study concerns itself with the prairie-influenced counties to the south and east of those described previously. In the five counties presented in this study the mesophytic forest was almost entirely inhibited and the most favorable areas were occupied by xeric oaks, or oaks and hickories, and even such forests could not always produce a closed canopy.