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The rowans (/ ˈ r aʊ ə n z / ROW-ənz or / ˈ r oʊ ə n z / ROH-ənz) [1] or mountain-ashes are shrubs or trees in the genus Sorbus of the rose family, Rosaceae.They are native throughout the cool temperate regions of the Northern Hemisphere, with the highest species diversity in the Himalaya, southern Tibet and parts of western China, where numerous apomictic microspecies occur. [2]
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 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.
As treated in its broad sense, the genus is divided into two main and three or four small subgenera: 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).
Sorbus vilmorinii, the Vilmorin's rowan [1] or Vilmorin's mountain ash, is a species of flowering plant in the family Rosaceae, native to Sichuan, Tibet and Yunnan in China. It is a deciduous shrub or small tree , 4–6 metres (13–20 ft) tall, with ferny leaves, each having multiple leaflets that turn purple in autumn (fall).
A tree can be defined as a large, perennial, woody plant with secondary branches supported by a primary stem (compare with shrub). There is no set definition regarding minimum size, though most authors cite a tree species as being one which regularly reaches 6 m (20 ft) tall with a single stem. [ 1 ]
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Sorbus commixta, the Japanese rowan, is a species of flowering plant in the family Rosaceae, native to central and eastern China, Korea, Japan, and Sakhalin (in the Russian Far East). [ 1 ] [ 2 ] [ 3 ]