American Mountain Ash. (Sorbus americana) http://aefoir.notlong.com/ 28 May 2008 American Mountain Ash. (Sorbus americana) A member of Rosaceae (Rose Family) . This pretty tree forms red/orange berries in profusion, and apparently some birds ingest them during the Winter, and they are sometimes made into jelly for human consumption. The wood is very tough, and was much sought after for making singletrees and whippletrees (double tree) in the horse drawn era, also for canoe frames, since it bends well and is extremely tough and pliable. A nice tree in a garden.