Calcareous cliff community
A community with sparse vegetation that occurs on vertical exposures, cliffs, and talus slopes of resistant bedrock such as limestone or dolomite or consolidated materials. There is little soil . Characteristic species include purple cliff brake, bulbet fern, early saxifrage, and eastern red cedar
Calcareous talus slope woodland
A woodland on calcareous talus slopes of limestone or dolomite, sometimes with numerous outcrops. Soils are usually moist and loamy. Characteristic trees include sugar maple, white ash, hop hornbeam, white oak, and eastern red cedar. Shrubs may be abundant if the canopy is open; characteristic shrubs include round-leaved dogwood, downy arrowwood, prickly ash, and bladdernut. Herbaceous vegetation may be diverse and includes bulbet fern, lady fern, bottlebrush grass, white baneberry, early meadow rue, bluestem goldenrod, and white wood aster
Shale cliff and talus community
A community with sparse vegetation that occurs on nearly vertical exposures of shale bedrock, ledges, and talus. The talus is unstable, there is little soil. Characteristic species include blunt-lobed woodsia, rusty woodsia. penstemon, herb-Robert, cyperus, little bluestem, panic grass, Carex pensylvanica, and eastern red cedar.
A shrubland with at least 50% cover of shrubs that occurs on agricultural fields 10 - 25 years after abandonment, following other disturbance, and especially on sites with restricted drainage. Characteristic shrubs include gray dogwood, raspberries, hawthorn, serviceberries, chokecherry, sumac, nannyberry, arrowwood and buckthorn. Herbs are of those of old-fields. Seedlings of white pine, red maple and white ash are usually present
Successional old field
Successional northern hardwoods
A forest that occurs on sites that have been cleared or otherwise disturbed. Dominant trees are usually two or more of the following; red maple, white pine, white ash, gray birch, quaking aspen, big-tooth aspen, and, less frequently, sugar maple. Tree seedling and saplings may be of more shade tolerant species. Shrubs and ground cover species may be those of old-fields. In abandoned pasturelands apples and hawthorns may be present in the understory.
The aquatic community of stream that has a well-defined pattern of alternating pool, riffle, and run sections. Waterfalls and springs may be present. Typical aquatic macrophytes include waterweed, and linear leaved pondweeds such as sago pondweed.
The aquatic community of a small ephemeral streambed with a moderate to steep gradient, where the water flows only during the spring or after a heavy rain. The streambed may be covered with mosses such as Bryhnia novae-angliae.
Appalachian oak-hickory forest
A hardwood forest that occurs on well-drained sites, usually on flat hilltops, upper slopes, or south and west facing slopes. Dominant trees include one or more of red oak, white oak, and black oak. Mixed with oaks, are one or more of pignut, shagbark, and sweet pignut hickory. Common associates are white ash, red maple, and hop hornbeam. Small trees include flowering dogwood, witch hazel, shadbush, and choke cherry. Shrubs and groundlayer flora are diverse. Shrubs include maple-leaf viburnum, blueberries, red raspberry, gray dogwood, and beaked hazelnut.
Mixed oak forest
A forest dominated by oaks found on steep south and west facing slopes. Soils may have calcareous materials at depth. Dominants are red, black, and white oak, and white pine. Black oak is an indicator of this type. Pignut hickory and red maple are usually present. Flowering dogwood and choke cherry are often abundant in the understory. Hemlock-northern hardwood forest
Rocky headwater stream
The aquatic community of a small to moderate sized rocky stream with a moderate to steep gradient. The cold water stream flows over eroded bedrock near the stream origin and contains alternating riffle and pool sections. These streams typically have mosses and algae present, but few larger rooted plants.