Sorbus Is A Genus Of About 100€“200 Species Of Trees And Shrubs In The Rose Family Rosaceae. Species Of Sorbus Are Commonly Known As Whitebeam, Rowan, Service Tree, And Mountain-Ash. The Exact Number Of Species Is Disputed Depending On The Circumscription Of The Genus, And Also Due To The Number Of Apomictic Microspecies, Which Some Treat As Distinct Species But Others Group In A Smaller Number Of Variable Species. Recent Treatments Treat Sorbus In A Narrower Sense To Include Only The Pinnate Leaved Species Of Subgenus Sorbus, Raising Several Of The Other Subgenera To Generic Rank. Red Rowan Sorbus Is Unrelated To The True Ash Trees Which Belong To The Genus Fraxinus, Although The Leaves Are Superficially Similar.

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apomictic ash belong circumscription commonly depending disputed distinct due exact family fraxinus generic genus group include known leaved leaves microspecies mountain narrower nred number others pinnate raising rank recent rosaceae rose rowan rowannnsorbus sense service several shrubs similar smaller sorbus species subgenera subgenus superficially treat treatments tree trees true unrelated variable whitebeam