Polygonum

Seedling of Dwarf Japanese knotweed plant Reynoutria or Fallopia japonica compacta

Dwarf japanese knotweed plant Reynoutria japonica compacta

Dwarf Japanese knotweed Fallopia or Reynoutria japonica compacta sketchbook study sheet

Dwarf Japanese knotweed Fallopia or Reynoutria japonica compacta with notes, sketchbook study of this invasive species

Giant knotweed Fallopia sachalinensis showing numerous drooping flowers, large leaves, stem section and detail of the orange underground rhizome

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