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Sorbus is a genus of over 100 species of trees and shrubs in the rose family, Rosaceae.Species of Sorbus are commonly known as rowan or mountain-ash.Currently, species commonly known as whitebeam, chequer tree and service tree are classified in other genera (see below), so that genus Sorbus includes only the pinnate leaved species of former subgenus Sorbus.
The following species are recognised in the genus Sorbus, many of which are called rowans or mountain-ashes: [1] This list follows a narrow definition of genus Sorbus; species that have been moved to the genera Aria, Torminalis, Cormus, Chamaemespilus, Hedlundia, Scandosorbus, Karpatiosorbus, Mayovskya and Normeyera are not listed.
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 americana is cultivated as an ornamental tree, for use in gardens and parks. It prefers a rich moist soil and the borders of swamps, but will flourish on rocky hillsides. A cultivar is the red cascade mountain-ash, or Sorbus americana 'Dwarfcrown'. It is planted in gardens, and as a street tree. [11]
The trees developed in a highly 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 ...
The whitebeams are members of the family Rosaceae, tribe Malinae, comprising a number of deciduous simple or lobe-leaved species formerly lumped together within Sorbus s.l. Many whitebeams are the result of extensive intergeneric hybridisation involving the genera Sorbus (Sorbus aucuparia in particular), Aria, Torminalis and Chamaemespilus.
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.
Inflorescence with honeybee. It is a medium-sized deciduous tree growing to 10–20 m (33–66 ft) tall with a stout trunk usually up to 60 cm (24 in), but sometimes as much as 2–3 m (6.6–9.8 ft) in diameter, [citation needed] and grey bark; the crown is dome-shaped, with stout horizontal branches.