Fallopia japonica (Houtt.) Ronse Decr. Fallopia japonica (Houtt.) Ronse Decr. in Bot. J. Linn. Soc. 98(4): 369. 1988 sec. Freeman & Reveal 2005≡Reynoutria japonica Houtt., Nat. Hist. 2: 640, plate 51, fig. 1. 1777 syn. sec. Freeman & Reveal 2005