Arran's endemic trees are located in a fenced area to protect them from the deer. The trees being: the Catacol whitebeam, Arran whitebeam, and Arran service tree. If rarity is measured by numbers alone, these are amongst the most endangered tree species in the world.
In 2007 it was announced that two specimens of the newly named Catacol whitebeam (Sorbus pseudomeinichii) had been discovered by researchers on Arran. The tree is a cross between the native rowan and whitebeam. Research into the genetics of whitebeam trees had shown that the population was much more diverse than previously thought and that the Arran whitebeams seem to be gradually evolving towards a new type of tree which will in all likelihood look very similar to a rowan.
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