Reynoutria:

Reynoutria japonica:

Reynoutria japonica Houtt., Polygonaceae: See Fallopia japonica (Houtt.) Ronse Decr.

Reynoutria sachalinensis:

Reynoutria sachalinensis (F. Schmidt) Nakai, Polygonaceae: See Fallopia sachalinensis (F. Schmidt) Ronse Decr.

I have no articles for this botanical term, but there might be some for the next level down (if found).