Warren Woods is a forested tract of about 37 acres, surrounded by Cornell fields. Parts of this forest are a lot wetter than you might expect. There are patches of hemlock, red maple, and white ash on slightly higher ground. However, hemlock and red maple can also tolerate the wet conditions on lower ground where black ash and American elm occur. To the north on drier ground, white oak, red oak, and hickories are found. Also there is a locally scarce tree species, black gum (Nyssa sylvatica). Forest herbs, especially ferns, are abundant. The site has a history of severe logging, so most of the trees are not very large. Further, site conditions - wetness and low fertility - appear to limit growth.