Plants and Animals
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With only select plants able to thrive in this steep environment, the Oak - Beech / Heath Forest has a look about it that is easy to recognize with a little practice. As you might imagine, however, there are plenty of transition zones (ecotones) between this community and the Mesic Mixed Hardwood Forest wherever the steepness, shape, or direction of the hill slope shifts to favor one community over the other. Ecobit: Natural Community Misfits
The trees whose crowns intercept most of the sunlight in a forest stand. The uppermost layer of a forest.
- American beech
- black oak
- chestnut oak
- white oak
- pitch pine (uncommon)
- Table Mountain pine (uncommon)
- Virginia pine (uncommon)
The canopy of the Oak - Beech / Heath Forest is populated by American beech and various oaks that are somewhat drought-tolerant (dry-site oaks), such as chestnut oak, white oak, and black oak. With its smooth gray bark, American beech presents a striking picture year-round. Its yellow autumn leaves turn tan and cling to its long, horizontal branches well into the winter months, making it easy to spot when other tree branches are bare.
- American beech
- flowering dogwood
- common serviceberry (occasional)
- hickory (occasional)
Young American beech trees make up much of the understory of the Oak - Beech / Heath Forest, along with small trees such as spring-blooming common serviceberry and flowering dogwood.
Shrubs, Saplings, and Vines
Shrubs, juvenile trees and vines at the right height to give birds and others a perch up off the ground but below the trees.
- black huckleberry
- mountain laurel
- pink azalea
- American witch-hazel (occasional)
- mapleleaf viburnum (occasional)
- roundleaf greenbrier (occasional)
Mountain laurel—a tall evergreen, shiny-leaved, gnarled shrub—is easy to notice in the Oak - Beech / Heath Forest. Look for its bright pink flowers in later May and June, when they contrast nicely against its dark green leaves. Those evergreen leaves stand out in late winter, dotting steep hillsides that are otherwise mostly a collage of browns and grays.
You can also find shorter blueberries, huckleberries, and pink azalea (striking in spring bloom).
Low Plants (Field Layer)
Plants growing low to the ground. This includes small shrubs and tree seedlings.
The field layer, which may include striped prince's-pine, partridgeberry, and American beech seedlings, is usually sparse in the Oak - Beech / Heath Forest because of the shade cast by mountain laurel, and the dense root mats of hillside blueberry bushes. Patches of moss often thrive where duff has eroded to expose mineral soil.
Non-Native Invasive Plant Species
Mesic Mixed Hardwood Forest) are occupied by a completely different set of plants (a “miniature natural community” of sorts) that can thrive in almost no soil at all, such as the “hydrangea rock gardens” in Rock Creek Park. This small but notable “community” of plants includes wild hydrangea, growing in the nooks and crannies of scattered rock outcrops. You can see the distinctive white blooms of the hydrangea shrub in the peak of summer, and its toothed, dark-green, egg-shaped leaves the rest of the year. Other plants grow in small pockets of soil within cracks in these rock outcrops—marginal woodfern, white wood-aster, New York fern, and violets, among others. Because of the extremely limited soil, this community cannot support trees, but only small shrubs and herbs. Keep an eye out for isolated pockets of "hydrangea rock gardens" tucked here and there in outcrops of mylonite or Laurel formation bedrock beside Valley Trail on the upslope side, and along the Lower Western Ridge Trail, low on the slope below Klingle Mansion.Some of the rock outcrops in the Oak - Beech / Heath Forest (and some in the
Map tip: To find these natural highlights, go to the interactive map of Rock Creek Park and search for "hydrangea."
layers, including a canopy and an understory of small trees and shrubs. This variety of structures provides ample places for nesting, feeding, and protection. Butterflies, moths, bats, chipmunks and squirrels, and many varieties of songbirds (for instance wood thrush, red-eyed vireo, scarlet tanager, robins, woodpeckers, veeries, ovenbird, and even an occasional worm-eating warbler) may be found here. Likewise, white-tailed deer, raccoon, and red fox commonly use this habitat.Animals that use the Oak - Beech / Heath Forest include those that thrive in mature forests with multiple structural
Acorns and beechnuts, hard mast found here, are both excellent, high-energy, year-round food sources consumed by much of the wildlife. Many forest animals also consume soft mast that grows here seasonally—perishable berries of flowering dogwood, common serviceberry, mapleleaf viburnum, blueberries, and huckleberries.