From Flora of Indiana (1940) by Charles C. Deam

This is generally a small tree, 3-8 inches in diameter, larger ones are rare. The largest redbud I ever saw was located on the Dicksburg Hills in Knox County. It was more than 2 feet in diameter at breast height. When I reported this tree to Prof. H. C. Cowles of Chicago University, he doubted the identity of the species or the measurements and made a trip to the tree and verified my measurement. It is found in woodland throughout the state, being most abundant in the southern half and infrequent to rare in the northern counties. Its preferred habitat is wooded ravines and banks of streams. At maturity the leaves are glabrous on both surfaces with a few hairs in the axils of the veins beneath or are more or less pubescent on the lower surface. The glabrous form has been named forma glabrifolia Fern. (Rhodora 38: 234. 1936).