Indiana bats use at least 29 tree species during the summer. The greatest numbers of tree species are found in the central portion of Indiana bats' range (primarily Missouri, southern Illinois, southern Indiana, and Kentucky), but this is likely because the majority of research conducted on the species has occurred in this region. Roost trees from these central states, which are mainly in the oak-hickory cover type, include silver maple, red maple ("Acer rubrum"), sugar maple ("A. saccharum"), white oak ("Q. alba"), red oak ("Q. rubra"), pin oak ("Q. palustris"), scarlet oak ("Q. coccinea"), post oak ("Q. stellata"), shingle oak ("Q. imbricaria"), eastern cottonwood, shagbark hickory, bitternut hickory, mockernut hickory ("C. alba"), pignut hickory ("C. glabra"), American elm, slippery elm ("Ulmus rubra"), honey locust ("Gleditsia triacanthos"), sourwood ("Oxydendrum arboreum"), green ash ("Fraxinus pennsylvanica"), white ash ("F. americana"), Virginia pine ("Pinus virginiana"), American sycamore ("Platanus occidentalis"), and sassafras ("Sassafras albidum").