Since the C&O Canal borders along the Potomac River, much of the forest that exists along the river's edge are in low-lying floodplains. These areas can be subject to high flows of water from the Potomac River, causing the soil to become moist or at times, temporarily submerged. Many native plants found here have shallow roots and like moist soils, so they are well adapted to living in these habitats. Trees in this forest type can include: American Sycamore (Platanus occidentalis), Silver Maple (Acer saccharinum), Box Elder (Acer negundo), and Green Ash (Fraxinus pennsylvanica). Native components of the understory are often young Paw Paw (Asimina triloba) trees and Northern Spicebush (Lindera benzoin) shrubs as well as herbaceous plants like Lizard's-Tail (Saururus cernuus).