Much of the data plotted below are recent and will be included in the third BSBI atlas, due to be published in 2020, recording for which will continue until 2019. If anyone reading this can help populate some some of the lighter shaded squares, contributions would be gratefully received and acknowledged.
NB. The map only includes data held in the MapMate database and those squares shown to the east of the NPT boundary (it's faint, but you can just about see it!) have data that have not yet been digitised. Similarly, a lot of historical data have not been digitised and are not plotted, which means the map largely shows a modern pattern of plant diversity.
Finally a plant, a double-flowered form of Cardamine pratensis (Cuckooflower), a small population of which grows in semi-natural grassland in Singleton Park, kindly brought to my attention by Viv Lewis.