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.

Polygonum oxyspermum subsp. raii - Ray's Knotgrass

Ray' s Knotgrass is a plant of sand or fine shingle, growing above High Water Mark of Spring tides. Population numbers are often small and very variable from year to year, but it can be plentiful as at Porthtowan on the north coast (SW64Z, 1991, A.L.Grenfell), at Pentewan (SX04I, 1991, P.E.Tompsett) and Par (SX05R, 1991, G.C.Matthews), on the south coast. On the Lizard it was once found inland at Penhale Crossroads (SW61Z, 1980s, A.J.Byfield) where marine sand had been dumped. It is very rare on Scilly.

Click here to see Aphotoflora images by David Fenwick


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