Ries whitebeam
| Ries whitebeam | ||||||||||||
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Ries whitebeam ( Sorbus fischeri ) |
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| Scientific name | ||||||||||||
| Sorbus fischeri | ||||||||||||
| N.Mey. |
Ries or Fischer's whitebeam ( Sorbus fischeri N. MEY.) Is a plant species that belongs to the complex of bastard whitebeam ( Sorbus latifolia agg.) Within the rose family (Rosaceae). This deciduous tree is a fixed hybrid from a hybridization of the real whitebeam i. w. S. ( Sorbus aria s. L.) Originated with the service tree ( Sorbus torminalis ). As an agamosperm species, it reproduces asexually.
Sennikov and Kurtto have been running the species under the name Karpatiosorbus fischeri since 2017 .
description
The Ries whitebeam Sorbus fischeri is a small, up to 8 m high, deciduous tree. The growth habit is narrow pyramidal, the bark is reminiscent of a cherry tree. The leaves are small, diamond-shaped-elliptical, already coarse when young, with a glossy dark green upper side, green to gray-tomentose underneath. In terms of leaf cut, the clan is similar to the Franconian whitebeam ( Sorbus franconica BORNM. Ex DÜLL), the Hoppes whitebeam ( Sorbus hoppeana N.MEY.) Or the Baden whitebeam ( Sorbus badensis DÜLL). The fruits ripening in early autumn are spherical, apple-shaped to slightly pear-shaped, around 12 mm × 13 mm in size.
Discovery and naming
The Ries whitebeam was first collected as Sorbus franconica by various botanists between 1966 and 1989 . In the 1990s, the biologist Norbert Meyer, who specializes in whitberry species, studied the taxon in more detail and finally re-described the species in 2005. He named Sorbus fischeri after the botanist Rudolf Fischer (1934–1983), the author of the "Flora des Rieses".
Occurrence
The species colonizes over 200 specimens in a closed area in the southeastern Bavarian Riesrand and some ridges within the Ries (Germany). It quickly becomes rare and isolated on the plateau. Evidence from Baden-Württemberg is missing. It grows on Jura dolomite or Ries rubble. The habitats are on the edge of the forest, in bushes and fringed stands, more rarely free-standing on sheep pastures ( Hühnerberg ).
Individual evidence
- N. Meyer (2016): Sorbus. In: Rothmaler, Exkursionsflora von Deutschland - Vascular Plants, Critical Supplementary Volume. - 11th ed., Pages 113-130.
- N. Meyer, L. Meierott, H. Schuwerk, O. Angerer (2005): Contributions to the genus Sorbus in Bavaria. Special volume of the reports of the Bavarian Botanical Society, 216 pages.
- Sorbus fischeri N. MEY., Rz.uni-karlsruhe.de
- A. Sennikov, A. Kurtto: A phylogenetic checklist of Sorbus s. l. (Rosaceae) in Europe. In: Memoranda Soc. Fauna Flora Fennica 93, Helsinki 2017, pages 1-78. https://journal.fi/msff/article/view/64741
