Sorbus arranensis rupicola") which is still found on Holy Isle. This hybrid species interbred with the rowan/mountain ash ("Sorbus aucuparia") to produce "S. arranesis". The bastard mountain ash ("Sorbus pseudofennica") arose from a further cross between "S. arranensis" and the mountain ash ("S. aucuparia"). Smart showed by using physical characteristics that the species were separate and not a result of random variation. Some overlap does however occur and this suggests that some hybridising may occur between the two species. Sorbus arranensis Sorbus arranensis, sometimes referred to as the Scottish or Arran whitebeam is a species of plant in the family Rosaceae. It
× Sorbaronia mitschurinii × Sorbaronia mitschurinii × "Sorbaronia mitschurinii, also known as Sorbaronia mitschurinii", is a domesticated species that was known until recently under the name "Aronia mitschurinii". It has been considered to be a group of cultivars of "Aronia melanocarpa", common ones including 'Viking' and 'Nero'. Genetic testing indicates it is likely a hybrid between "A. melanocarpa" and "Sorbus aucuparia" (mountain ash) that apparently originated in cultivation. It has been suggested that "Sorbaronia mitschurinii" is the product of Russian pomologist Ivan Vladimirovich Michurin's early 20th century experiments in wide hybridizations. This species is more robust than wild populations of "Aronia melanocarpa"; the