Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Walters
Ranges from rich bottomlands and (especially northward) river banks or lake shores to dry sandy open upland forests or depressions in such forests. This was the characteristic scattered tree of savannas called “oak openings” in the early days of settlement in southern Michigan. Many fine large specimens of bur oak, some well over 200 years old, continue to grow as shade trees where they have escaped the ax, saw, and bulldozer, even in cities.
An occasional specimen of Q. bicolor may resemble this species, if the leaves are larger and more deeply lobed than usual, but the glabrous buds, long peduncles, and more whitened undersides of the leaves in Q. bicolor should distinguish it. See also the notes under Q. bicolor. The large “mossy cup” acorns of Q. macrocarpa are sessile or on peduncles at most about 1 (–1.5) cm long, but even in the absence of this distinctive fruit the species can usually be easily recognized by the large leaves, much more deeply lobed on the basal half than on the apical half.
Hybrids with Q. bicolor (Q. ×schuettei Trel.), appear to be more frequent in Michigan than those with Q. muehlenbergii (Q. ×deamii Trel.); an apparent hybrid with Q. prinoides, Q. ×beckyae Gaynor, has been found in Livingston Co.