The tetrad maps below were prepared by Andy Amphlett for the Botanical Society of Britian and Ireland, in early June 2017. They show the number of species recorded from 2000 onwards in the three vice-counties (or parts thereof) making up the county of Cumbria.
A much-enlarged version of each map can be displayed by selecting it with a click/tap!
There is currently a great deal of recording taking place across the county, so if you are intending recording an apparently unrecorded or under-recorded area, you should contact Phill Brown to ascertain the very latest position. (There are contact forms on this site, e.g. at the bottom of this page, or contact him via Cumbria Botany Group Facebook pages.)
The diversity of vascular plant species in the county increases somewhat from north to south, but is also obviously very dependent on altitude, soil-type, land-use, presence of river-courses, etc. A typical lowland tetrad in this part of the planet with a reasonable range of habitats will often reveal 250-300 species after a through survey, and a few visits through the season. In southern Cumbria, this may rise to ca. 400. Although the highest ground has a very limited range, at the scale of the tetrad most squares will have some lower ground with much greater diversity. This is more true of the Lake District mountains with their deeply dissected topography; some plateau areas of the high northern Pennines lie at middle to high altitudes throughout.
(Note that the basemap used by BSBI outlines the LOW tide mark. What appear as ‘unrecorded’ areas, e.g. in Morecambe Bay and the inner Solway Firth, are largely intertidal mudflats.)
The last map above shows that part of Vice-county 65 (Northwest Yorkshire) in the county of Cumbria.