Fallopia baldschuanica (Regel) Holub

Fast-growing woody climber forming a matted tangle of stems. Leaves 3-8 cm long, ovate to oblong, cordate at the base with a pointed tip and wavy edges. Flower clusters drooping, white to pink. Flowers 6-8 mm wide in late summer or autumn. [Polygonum baldschuanicum Regel]

Russia (Tadzikhistan)

 

F. aubertii (L. Henry) Holub is similar but it has erect flower clusters and larger flowers. [Polygonum aubertii L. Henry]

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.