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
Berry Mountain River and Long Island Sound. The east side drains into Lulu Creek and Parker Brook, thence into Onota Lake, the Housatonic River, and Long Island Sound. Berry Mountain Berry Mountain, east peak and west peak , is a prominent mountain in the Taconic Mountains of western Massachusetts. The mountain is located in Pittsfield State Forest. The west peak is traversed by the Taconic Crest hiking trail and the east peak is traversed by the multi-use Taconic Skyline Trail. The summits are mostly wooded with northern hardwood forest species, but also support a field of wild azaleas. A microwave tower stands