An introduction to Oplismenus undulatifolius (Ard.) Roem. & Schult. (wavyleaf basketgrass), a recent invader in Mid-Atlantic forest understories1,2

“At the landscape scale the USDA estimates that 30 percent of the U.S. is suitable for the establishment of O. undulatifolius.”

http://www.bioone.org/doi/abs/10.3159/TORREY-D-13-00033.1?prevSearch=&journalCode=tbot