Sorbus rupicola

Rock Whitebeam at the Trondheim fjord (Norway ) on greenstone

The Rock Whitebeam (Sorbus rupicola ) is a rare type of Sorbus aria group. It is in the British Isles (Ireland, Scotland, England ) and in southern Scandinavia ( South and Central Norway, Sweden) common, but usually comes only locally in small stocks before. Preferably, it occurs on base- rich substrate on forest edges and thickets.

The trees of the Rock Whitebeam usually reach heights of three to five meters. The species reproduces apomictically ( apomixis ) and is believed by Autopolyploidisierung the Whitebeam in the strict sense ( Sorbus aria s.str. ) Emerged. It has a tetraploid chromosome set to (2n = 4x = 68 ).