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Hybrid clans between Whitebeam and Wild Service Tree
Whitebeam Sorbus aria and Wild Service Tree Sorbus torminalis are able to generate hybrids if they occur together. In several regions such hybrids have developed to stabilized and hereditary-stable hybrid clans, with different appearance in different regions although they have the same parents. In their region they form smaller or bigger populations, which botanists today are treating as closely related species.
In Germany a cumulation of such hybrid clans can be observed in parts of Franconia together with adjacent regions of Bavaria around Regensburg, of Baden-Württemberg in the Tauber region, and of Thuringe. But also in other countries as e.g. France, the British Islands, Scandinavia and Eastern European Countries there are hybrid clans.
Attributes as the different forms of the parents' leaves, the pubescense of the bottom side of Whitebeam's leaves which the Wild Service Tree doesn't have, the figure of the tree, and more attributes of the parents are intermediate in any way at the hybrid clans, but more or less different at each of them. In the spring the leaves of many clans have a slight pilosity also at the top side, a heritage of Whitebeam, which they loose during the summer, when the leaves become more coriaceous. The hybrid clans of which I have already taken photos are presented by showing the different forms of their leaves.
 
Sorbus aria, Whitebeam
Sorbus aria / Whitebeam
Rosaceae / Rose Fam.
 
Sorbus collina, Pannonian Whitebeam
Sorbus collina / Pannonian Whitebeam
Rosaceae / Rose Fam.
 
Sorbus torminalis, Wild Service Tree
Sorbus torminalis / Wild Service Tree
Rosaceae / Rose Fam.
 
Sorbus latifolia s.l., Broad-Leaved European Mountain-Ash
Sorbus latifolia s.l. / Broad-Leaved European Mountain-Ash
Rosaceae / Rose Fam.
  Weinheim an der Bergstraße
 

 

 

 

 
The Broad-Leaved European Mountain-Ash in narrow sense comes from the region around Paris, elsewhere it is also grown in parks.
 
The Broad-Leaved European Mountain-Ashes from the Nahe / Hunsrueck / Rheinhessen region haven't got an own name (yet), but it seems that they are not unique, but seem to have developed at several places. The leaf forms of some of these seem to be closer to the type population from Paris than the one from a garden at Weinheim shown left.
Sorbus latifolia s.l., Broad-Leaved European Mountain-Ash
Sorbus latifolia s.l. / Broad-Leaved European Mountain-Ash
Rosaceae / Rose Fam.
  Idar-Oberstein
 
Sorbus fischeri, Ries Whitebeam
Sorbus fischeri / Ries Whitebeam
Rosaceae / Rose Fam.
  Noerdlinger Ries, Harburg in Schwaben
 
Sorbus meierottii, Wellheim Whitebeam
Sorbus meierottii / Wellheim Whitebeam
Rosaceae / Rose Fam.
  Wellheim in Urdonau Valley
 
Sorbus eystettensis, Eichstaett Whitebeam
Sorbus eystettensis / Eichstaett Whitebeam
Rosaceae / Rose Fam.
  Eichstaett
 
Sorbus schuwerkiorum, Schuwerk's Whitebeam
Sorbus schuwerkiorum / Schuwerk's Whitebeam
Rosaceae / Rose Fam.
  Greding
 
Sorbus ratisbonensis, Regensburg Whitebeam
Sorbus ratisbonensis / Regensburg Whitebeam
Rosaceae / Rose Fam.
  Undorf near Regensburg
 
Sorbus mergenthaleriana, Mergenthaler's Whitebeam
Sorbus mergenthaleriana / Mergenthaler's Whitebeam
Rosaceae / Rose Fam.
  Etterzhausen near Regensburg
 
Sorbus hoppeana, Hoppe's Whitebeam
Sorbus hoppeana / Hoppe's Whitebeam
Rosaceae / Rose Fam.
  Krachenhausen near Kallmuenz
 
Sorbus franconica, Franconian Whitebeam
Sorbus franconica / Franconian Whitebeam
Rosaceae / Rose Fam.
  Franconia, Ebermannstadt
 
Sorbus schnizleiniana, Schnizlein's Whitebeam
Sorbus schnizleiniana / Schnizlein's Whitebeam
Rosaceae / Rose Fam.
  Franconia, Neukirchen
 
Sorbus badensis, Baden Whitebeam
Sorbus badensis / Baden Whitebeam
Rosaceae / Rose Fam.
  Tauber Region, Koenigheim
 
Sorbus seyboldiana, Seybold's Whitebeam
Sorbus seyboldiana / Seybold's Whitebeam
Rosaceae / Rose Fam.
  Tauber Region, Werbachhausen
 
Sorbus meyeri, Meyer's Whitebeam
Sorbus meyeri / Meyer's Whitebeam
Rosaceae / Rose Fam.
  Tauber Region, Kuelsheim
 
Sorbus koksensis, Koks Whitebeam
Sorbus koksensis / Koks Whitebeam
Rosaceae / Rose Fam.
  Tauber Region, Kuelsheim
 
Sorbus haesitans, Thuengersheim Whitebeam
Sorbus haesitans / Thuengersheim Whitebeam
Rosaceae / Rose Fam.
  Franconia, Thuengersheim
 
Sorbus cochleariformis, Spoon-Leaved Whitebeam
Sorbus cochleariformis / Spoon-Leaved Whitebeam
Rosaceae / Rose Fam.
  Franconia, Untererthal
 
Sorbus puellarum, Girlish Whitebeam
Sorbus puellarum / Girlish Whitebeam
Rosaceae / Rose Fam.
  Franconia, Uettingen
 
Sorbus moenofranconica, Main-Franconian Whitebeam
Sorbus moenofranconica / Main-Franconian Whitebeam
Rosaceae / Rose Fam.
  Erlenbach near Marktheidenfeld
 
Sorbus herbipolitana, Wuerzburg Whitebeam
Sorbus herbipolitana / Wuerzburg Whitebeam
Rosaceae / Rose Fam.
  Franconia, Guentersleben near Wuerzburg
 
Sorbus x vagensis, Hybrid Service Tree
Sorbus x vagensis / Hybrid Service Tree
Rosaceae / Rose Fam.
  Franconia, Leinach NW Wuerzburg
 
Sorbus perlonga, Long-Leaved Whitebeam
Sorbus perlonga / Long-Leaved Whitebeam
Rosaceae / Rose Fam.
  Franconia, Leinach NW Wuerzburg
 
Sorbus adeana, Ade's Whitebeam
Sorbus adeana / Ade's Whitebeam
Rosaceae / Rose Fam.
  Franconia, Weismain
 
Sorbus cordigastensis, Kordigast Whitebeam
Sorbus cordigastensis / Kordigast Whitebeam
Rosaceae / Rose Fam.
  Franconia, Weismain, Großer Kordigast
 
Sorbus acutisecta, Acute-Lobate Whitebeam
Sorbus acutisecta / Acute-Lobate Whitebeam
Rosaceae / Rose Fam.
  Hessen, Treffurt
 
Sorbus isenacensis, Eisenach Whitebeam
Sorbus isenacensis / Eisenach Whitebeam
Rosaceae / Rose Fam.
  Thuringe, Eisenach
 
Sorbus decipiens, Sharp-Toothed Whitebeam
Sorbus decipiens / Sharp-Toothed Whitebeam
Rosaceae / Rose Fam.
  Thuringe, Waltershausen
 
Sorbus multicrenata, Many-Scored Whitebeam
Sorbus multicrenata / Many-Scored Whitebeam
Rosaceae / Rose Fam.
  Thuringe, Bad Blankenburg
 
Sorbus subcordata, Arnstadt Whitebeam
Sorbus subcordata / Arnstadt Whitebeam
Rosaceae / Rose Fam.
  Thuringe, Arnstadt
 
Sorbus heilingensis, Heilingen Whitebeam
Sorbus heilingensis / Heilingen Whitebeam
Rosaceae / Rose Fam.
  Thuringe, Kleinbucha
 

 
Naturally this list isn't complete. It will be continued on occasion.
 
The botanical garden of the University of Regensburg grows a remarkable collection not only of Sorbus trees, but also of other members of the Rose family, mainly Brambles, Hawthorns and native Roses.
 
Hybrid clans between Whitebeam Sorbus aria resp. Pannonian Whitebeam Sorbus collina and Rowan Sorbus aucuparia you can find here.  
 

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7-Jun-2016

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