Great Falls Park, McLean, Potowmack Chapter
This 800-acre park, owned by the National Park Service and managed by the George Washington Memorial Parkway, and is a popular outdoor spot. Vegetation includes upland and floodplain forest and rare vegetation communities on bedrock terraces, exposed rocks and frequently flooded Potomac River shores. One of the largest known examples of a state rare community is the Northern Piedmont/Lower New England Basic Seepage Swamp. Twenty-seven rare, threatened, or endangered plant species in Virginia and several regionally rare plants are located here.