Cornish Biodiversity Network  -  Supporting Wildlife Recording

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Flora of Cornwall (1999)

The descriptive text, below the map, is from the Flora of Cornwall (1999), which was a Tetrad Atlas (the maps had 2km square dots or Tetrads). The map on this web page depicts the plant's distribution at the 1km square scale and shows the records made pre-2000 which were used in the 1999 Flora and those made since.

Fallopia sachalinensis - Giant Knotweed

Giant Knotweed is rare and does not spread like Japanese Knotweed. It is established by a stream at Polzeath (SW97J, 1990, R.W.David). First seen here in 1950, its identification has been confirmed (Bailey & Conolly, 1991). Other records for this species may be correct, but it could not be refound at Chy-an-hal near Penzance (SW42P, 1975, A.C.Leslie) all plants here being the true F. japonica var. japonica . At Lanarth on the Lizard (SW72Q, 1981-1984, UBLP) plants recorded as F. sachalinensis proved to be the hybrid F. x bohemica (Bailey & Conolly, 1991).


French, C.N., Murphy, R.J. & Atkinson, M. 1999. Flora of Cornwall. Wheal Seton Press, Camborne.