This is the stretch traversed by the Billy Goat Trail. In the District of Columbia, nearly all of the species can be found somewhere in Rock Creek Park . Many also can be found on Theodore Roosevelt Island . Nearby Virginia has many good sites. Almost anywhere that you can gain access to the banks of the Potomac River is likely to be rewarding.
Several places are notable.
At Ball's Bluff Regional Park , just east of Leesburg, find twinleaf, Virginia bluebells , blue phlox , and many others. Riverbend Park to Great Falls Park rivals the Great Falls to Bear Island area across the river in Maryland. Some typical wildflowers of upland woods, such as the always spectacular pink lady's-slipper , can be seen along the nature trail at the Laurel Ridge Center of the National Wildlife Federation in Virginia west of Tyson's Corner. The localized wetland species, golden-club , also occurs at the latter site. Most of the wildflowers on this list can be seen in Fern Valley at the National Arboretum , where they have been planted in a natural setting.