=Distribution.=--Known to have been a native of the southwestern part of Indiana, and to have followed the valley of the Ohio and Mississippi Rivers to the southeastern part of Missouri and the northeastern part of Arkansas. The tree has practically disappeared from the forests of Indiana, and the exact range in Indiana can never be known. Being such a conspicuous tree, it was thought that the memory of living pioneers might be relied upon to fix the limits of its range in Indiana. One pioneer living near Austin in Scott County said it was a native of the Muscatatuck bottoms, and another said it was a native in the flats of the southwestern part of Clark County. In its native habitat it was found only in very low ground, usually with such associates as pin oak, sweet gum, southern hackberry, big shellbark hickory, pecan, etc. In its native habitat it was an infrequent to a frequent tree, never a common tree. A pioneer was interviewed who settled in the Knox County bottoms about three miles west of Decker, when the whole area was a virgin forest. He said the catalpa was an occasional tree in the bottoms throughout the area; that he did not recall that it was ever found in as low situations as the cypress; that the tree was as tall as its associates, straight, and usually about 6 dm. in diameter, and that he never saw a tree a meter in diameter; that on account of the durable quality of the wood that it was cut for fence posts and rails. A pioneer who lived near the mouth of Deer Creek in Perry County said it was a native in his vicinity. The information at hand would fix the mass distribution of the species to the southwest of a line drawn from Terre Haute to a point about 6 miles east of Grandview in Spencer County.