Parks Department

Invasive Species

Polygonum perfoliatum flowers inside cup-like leaf bracts (Photo: Jil M. Swearingen, USDI National Park Service, www.forestryimages.org)

Polygonum perfoliatum flowers inside cup-like leaf bracts
(Photo: Jil M. Swearingen, USDI National Park Service, www.forestryimages.org)