Arran whitebeams complex fashion, which involved the common whitebeam ("Sorbus aria") giving rise to the tetraploid rock whitebeam ("Sorbus rupicola") which is still found on Holy Isle. This species is able to survive at higher altitudes and therefore occupies a less competitive niche with fewer tree species able to tolerate the harsher conditions. The rock whitebeam interbred with the rowan / mountain ash ("Sorbus aucuparia") to produce the hybrid, a fertile separate species the Scottish whitebeam ("Sorbus arranesis") which grows well in this zone of reduced competitive growth at higher altitudes. The bastard mountain ash ("Sorbus pseudofennica") arose from a further cross
Sorbitol an enema. Sorbitol works as a laxative by drawing water into the large intestine, stimulating bowel movements. Sorbitol has been determined safe for use by the elderly, although it is not recommended without the advice of a doctor. Sorbitol is found in some dried fruits and may contribute to the laxative effects of prunes. Sorbitol was first discovered in the fresh juice of mountain ash (Sorbus aucuparia) berries in 1872. It is also found in the fruits of apples, plums, pears, cherries, dates, peaches and apricots. Sorbitol is used in bacterial culture media to distinguish the pathogenic from most other