- The Bristol Whitebeam (Karpatiosorbus bristoliensis)
- endemic to Great Britain, growing wild only in the Avon Gorge and Leigh Woods area of Bristol
- first discovered in Leigh Woods by botanist Martha Maria Atwood in 1852
- research has exposed a very delicate reproductive system and ongoing evolution among this rare Sorbus species
- population estimated at around 300 individuals in 2016 and increasing by about 10% per decade
- oldest known tree is around 240 years old with many others over 100 years old
- Conservation Status: ENDANGERED