(DC) (Rock Creek Conservancy) Help the National Capital Region Invasive Plant Management Team, Rock Creek Park, and Invader Detectives scout for Arum italicum (Italian Arum), corydalis incisa (Incised Fumewort), berberis bealai (Leatherleaf Mahonia)! We will be hiking and recording any presence of these three plants on the Western Ridge Trail. Our goal is to search for and understand the extent ...