Haringey Knotweed

Fallopia × conollyana
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Core eudicots
Order:	Caryophyllales
Family:	Polygonaceae
Genus:	Fallopia
Species:	F. × conollyana
Binomial name
Fallopia × conollyana J.P.Bailey

Fallopia × conollyana (Haringey knotweed or railway-yard knotweed) is a hybrid between the Russian vine (Fallopia baldschuanica) and Japanese knotweed (Fallopia japonica). The only known wild British population was discovered ("new to science") by David Bevan at Railway Fields in 1987.

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Wikipedia