Persicaria filiformis (Thunberg) Nakai. Japanese Jumpseed. Hab: Suburban woodlands, escaping from horticultural use. Dist: Native of e. Asia. Reported as naturalizing in Baltimore County, MD, and Arlington County, VA (Simmons et al. 2020), but probably more widespread than currently mapped.
Origin/Endemic status: E. and se. Asia
Syn: = Persicaria virginiana var. filiformis – Shaw (2008); < Persicaria filiformis – K4