Polygonum cuspidatum

Japanese Knotweed Fallopia japonica showing subterranean roots

Japanese Knotweed Fallopia japonica without roots.  Illustration shows details of the small white flowers and winged seed.

Hybrid knotweed Fallopia japonica x Fallopia sachalinensis showing stem, flowers, leaves, and typical growth habit

Pollinators bee ant hoverfly on Japanese knotweed Fallopia japonica

Japanese Knotweed Fallopia japonica Sketchbook study

Japanese knotweed Fallopia japonica root crown with cross section of root and detail of pink growing tips