The Glades have been the subject of much scientific study, especially during the 1930s, 1940s and 1950s. Professor
Maurice Brooks conducted studies in 1930, 1934, and 1945. The work of Strausbaugh (1934), Darlington (1943), and
Core (1955) followed. In 1974, the Cranberry Glades Botanical Area was designated a
National Natural Landmark.
Flora Many of the plants found in the Glades resemble those in the northern region of North America. They are descendants of seeds that took root over 10,000 years ago before the
last glacial retreat. Among these are two unusual species of
carnivorous plants that thrive in the area—the
purple pitcher plant and native
sundew. They evolved carnivorous habits because of the scarce root food in the spongy soil. Two very rare boreal plants—
bog rosemary and
buckbean—live in the Big Glade. Much of the area provides a home for many species of
mosses. These include a cover of
sphagnum moss,
bird-wheat moss, bog moss and
reindeer lichen.
Hummocks of these plants reach a height of . Over top of these grow prostrate cranberry vines that bloom pink flowers in the summer, fruiting in late September. Most tree species occur in the "bog forest" habitat, which is composed primarily of a mixture of
red spruce,
eastern (or Canada) hemlock,
yellow birch and
red maple. The upland forests immediately surrounding the wetlands are dominated by these same species, but also include
American beech,
sugar maple,
black cherry,
American basswood,
white ash,
yellow buckeye,
black birch,
cucumber tree,
Fraser magnolia, and
northern red oak. The
shrub layer, unlike the
tree layer, is relatively species-rich. This is a consequence of the widespread presence of low- to medium-height woody plants throughout
shrub swamps, forest habitats, and
open glades. In the fringes of open glades and along streams, the dominant species is usually
speckled alder. Also common are
willow,
pipestem,
glade St. Johns-wort,
great rhododendron,
hobblebush,
smooth arrowwood,
wild raisin,
ninebark,
alternate-leaved dogwood,
bunchberry,
winterberry holly,
mountain holly,
swamp rose, the Appalachian endemic
longstalked holly and many more. Most of these shrubs have markedly northern distributions, and
bog rosemary and
oblongfruited serviceberry are at their southernmost limits of distribution. The
Canada yew is an uncommon evergreen shrub that was historically reported as abundant in the area. Nearby Yew Creek is presumably named for this species, as may be the broader
Yew Mountains region in which the Glades are located. Browsing deer have reduced the number of Canada yew to such an extent that it is found only in scattered locations throughout its central Appalachian range. Many herbs with primarily northern distributions occur here, including
oak fern,
pod grass,
Canada mayflower,
mountain bindweed,
marsh marigold,
goldthread,
swamp saxifrage,
white wood sorrel,
northern white violet,
Jacob's ladder and
buckbean. Jacob's ladder is at its southernmost location. Grasses and sedges found here include
blue joint,
drooping wood reed grass,
millet grass,
rattlesnake mannagrass,
interior sedge, and
Fraser's sedge. Wild lilies in the Glades include
yellow clintonia and
white hellebore. Orchids include
rose pogonia,
lesser rattlesnake plantain,
northern coralroot, and
grass-pink orchid that are in full bloom in July. Northern (or early) coralroot is probably at its southernmost location in the eastern United States.
Fauna Many animals that live in the Glades are at their southernmost breeding grounds, including birds such as the
Swainson's and
hermit thrushes,
Nashville and
mourning warblers, and
purple finches. Other, less exotic, birds like
ravens and
hawks are common. Other familiar animals including
white-tailed deer inhabit the Glades.
Black bears have been seen in the skunk cabbage growing along the boardwalk. In the evening, you have a good chance of hearing
beavers working; they are mostly inactive during the day. It is hard to see the beavers because of little light, and they are dark colored. They also reside submerged or are building their homes. ==Weather==