Within the more than four hundred vascular plants found at Saint-Gaudens several species are noteworthy because they near the limit of their range in this area. The American Sycamore probably reaches the northern limit of its range in the Connecticut River valley at this site. Bitternut Hickory and Black Birch are also near their northern range limit, and Two-leaved Mitrewort is near its eastern range limit. Indian Pipe is fairly common and unique plant found at the site. It has the distinction of lacking chlorophyll, which accounts for its ghostly white appearance.