|Sorbus latifolia agg.|
The bastard whitebeams ( Sorbus latifolia agg.) Are a group of whitebeam species . They are hybrids between the service tree ( Sorbus torminalis ) and species of the whitebeam group ( Sorbus aria agg.). Sennikov and Kurtto have been running this genus under the name Karpatiosorbus since 2017 .
The bastard whitebeams are a natural complex of apomictic species that have arisen as a result of various hybridization processes , in the creation of which, in addition to the service tree ( Sorbus torminalis ), various species related to the whitebeam ( Sorbus aria sl) were involved. They plant i. d. R. continue apomictically, thus producing fertile seeds in an asexual way and are very constant in traits. These apomictic species are all endemic to smaller areas in Europe .
These whitebeams are often found in the same growing areas as the parent species. These are light and warm locations on calcareous soil. They are especially found in warm oak mixed forests (Quercion pubescenti-petreae) and oak-hornbeam forests, some species also in limestone beech forests (Fagion). In the Main-Tauber area (Bavaria and Baden-Württemberg), pine forests and their edges are popular habitats.
The areas sometimes go (e.g. in Sorbus badensis ) more or less clearly beyond those of a parent species (here Sorbus graeca sl).
They are mostly large, strong, rarely small trees or bushes. When young, the bark is smooth, later it tears open and the spine is backward. The leaves are oblong-ovate to almost circular. They are coarser than the service tree. The leaf margin is usually clearly lobed or double serrated, but differs greatly from species to species. Initially, the tips of the leaf teeth have a gland, as in the service tree. The leaf blade base is rounded or wedge-shaped. There are 8 to 12 pairs of lateral nerves, depending on the type. The underside of the leaves is greenish, gray or yellowish, thinly tomentose or woolly-tomentose and becomes partially bare in autumn. The leaf stalks are 15 to 30 millimeters long. The sepals dry up or remain fleshy. There are usually 2, rarely 3 or 4 styluses. The fruits are longer than broad or almost spherical and usually yellow-red, exceptions are Sorbus badensis with light red and Sorbus latifolia s. st. with yellow-brown. The lenticels of the fruit are different in number and size.
Among others, the following species belong to this complex in Central Europe:
- Baden whitebeam - Sorbus badensis
- Bohemian whitebeam - Sorbus bohemica
- Exceptional whitebeam - Sorbus eximia
- Franconian whitebeam - Sorbus franconica
- Broad-leaved whitebeam - Sorbus latifolia s. st.
- Kordigast whitebeam - Sorbus cordigastensis
- Ries whitebeam - Sorbus fischeri
- Meyer's whitebeam - Sorbus meyeri
- Slovak whitebeam - Sorbus slovenica
- Gredinger whitebeam - Sorbus schuwerkiorum
- Seybold whitebeam - Sorbus seyboldiana
Due to the largely identical external characteristics, the occasionally spontaneous primary hybrids ( Sorbus xdecipiens ) of the service tree ( S. torminalis ) and the whitebeam ( S. aria sl) are also included in the Sorbus latifolia group.
- Düll, Ruprecht : The Sorbus species and their hybrids in Bavaria and Thuringia . 1961
- Kutzelnigg, Herfried : Sorbus . In: Gustav Hegi : Illustrated flora of Central Europe . 2nd ed., Volume IV, Part 2B: 328-385. 1994
- Steffen Hammel, Bernd Haynold: Sorbus meyeri - a new species from the Sorbus latifolia group. In: Kochia, Volume 8, pp. 1-13. 2014
- Norbert Meyer, Lenz Meierott, Herbert Schuwerk, Otto Angerer: Contributions to the genus Sorbus in Bavaria. In: Ber. Bayer. Bot. Ges. (Special volume). 2005.
- Steffen Hammel, Bernd Haynold: Sorbus seyboldiana - a new whitebeam from Baden-Württemberg and Bavaria. In: Annual Issues of the Society for Natural History in Württemberg, Volume 171, pp. 51–68. 2015.
- Norbert Meyer: genus Sorbus . In: Frank Müller, Christiane M. Ritz, Erik Welk, Karsten Wesche (editor): Rothmaler Exkursionsflora von Deutschland. Vascular plants, critical supplementary volume. 11th edition. 2016
- Alexander Sennikov, Arto Kurtto: A phylogenetic checklist of Sorbus sl (Rosaceae) in Europe. In: Memoranda Soc. Fauna Flora Fennica 93, pages 1-78. https://journal.fi/msff/article/view/64741 . 2017
- Bastard whitebeams. In: FloraWeb.de.
- Distribution map for Germany. In: Floraweb .
- Sorbus latifolia aggr. In: Info Flora , the national data and information center for Swiss flora . Retrieved November 5, 2015.
- Regionalized list of endangered vascular plants in Bavaria (including all bastard whitebeam species that occur there)