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Sorbus aucuparia, commonly called rowan (/ ˈ r oʊ ən /, [3] also UK: / ˈ r aʊ ən /) and mountain-ash, is a species of deciduous tree or shrub in the rose family. The tree has a slender trunk with smooth bark, a loose and roundish crown, and its leaves are pinnate in pairs of leaflets on a central vein with a terminal leaflet.
The best-known species is the European rowan Sorbus aucuparia, a small tree typically 4–12 metres (13–39 ft) tall growing in a variety of habitats throughout northern Europe and in mountains in southern Europe and southwest Asia.
Sorbus (Sorbus) now genus Sorbus s.s., are commonly known as the rowan (primarily in the UK) or mountain-ash (in Ireland, North America and the UK), with compound leaves usually hairless or thinly hairy below; fruit carpels not fused; the type is Sorbus aucuparia (European rowan). Distribution: cool-temperate Northern Hemisphere. Sorbus (Aria)
The tree species Sorbus americana is commonly known as the American mountain-ash. [4] It is a deciduous perennial tree, native to eastern North America. [5]The American mountain-ash and related species (most often the European mountain-ash, Sorbus aucuparia) are also referred to as rowan trees.
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.
Arran whitebeam (Hedlundia arranensis), Arran service-tree (Hedlundia pseudofennica) and the Catacol whitebeam (Hedlundia pseudomeinichii) where all previously Sorbus species and have now been moved to the newly created genus Hedlundia as they are the product of inter-generic crossing involving rowan (Sorbus aucuparia) and rock whitebeam (Aria ...
Occasionally, European white elm (Ulmus laevis) and wild apple tree appear, while small trees include rowan (Sorbus aucuparia) and goat willow (Salix caprea). [9] The flora lacks beech, large-leaved linden, and field maple. [31] The main creators of tree stands are Scots pine, European hornbeam, and black alder.
Hedlundia pseudomeinichii, known as false rowan [2] and Catacol whitebeam, is a rare species of tree endemic to the Isle of Arran in south-western Scotland.It is believed to have arisen as a hybrid of the native European rowan (Sorbus aucuparia) and the cut-leaved whitebeam (Hedlundia pseudofennica) which is in turn a rowan/Arran whitebeam (Hedlundia arranensis) hybrid. [3]