Fallopia × conollyana
Encyclopedia
Haringey Knotweed is a hybrid between the Russian vine and the Japanese knotweed
Japanese knotweed
Japanese Knotweed is a large, herbaceous perennial plant, native to eastern Asia in Japan, China and Korea...

. The only known wild British population of this remarkable plant was discovered (“new to science”) by David Bevan at Railway Fields
Railway Fields
Railway Fields in Harringay, North London, is a Local Nature Reserve in the London Borough of Haringey. About one hectare in area, it was a railway goods yard until 1967.-Habitat, Flora & Fauna:...

in 1987. It is also known as the Railway-yard knotweed.
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