Fallopia japonica (Houtt.) Ronse Decraene

Many-stemmed perennial to 2 m tall with branched, reddish bamboo-like stems. Leaves broadly ovate to squarish, to about 12 cm long, 10 cm wide and a base distinctly straight and perpendicular to the stalk, tip pointed and generally elongated. Flowers more or less white in branched slender spikes. Nut 2-4 mm long, glossy brown or black. [Polygonum cuspidatum Sieb. & Zucc., Reynoutria japonica Houtt.]

F. japonica var. compacta (Hook. f.) Buchh. has a smaller overall habit with leaves round to almost square, 5-7 cm long and wide, flowers reddish pink in clusters to about 5 cm long.


Naturalised in NSW, Victoria and Tasmania.

Leaves mostly truncate at the base and tapered abruptly at the tip to give an extended acuminate point; flowers in slender spikes.

Source: Spencer, R. (1997). Polygonaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Polygonaceae
genus        Fallopia Adans.