Seybold whitebeam
| Seybold whitebeam | ||||||||||||
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Seybold whitebeam ( Sorbus seyboldiana ) |
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| Scientific name | ||||||||||||
| Sorbus seyboldiana | ||||||||||||
| S. Hammel & Haynold |
The Seybold whitebeam ( Sorbus seyboldiana S. Hammel & Haynold ) belongs to the bastard whitebeam ( Sorbus latifolia (Lam.) Pers. Agg.) From the plant genus whitebeam ( Sorbus L. ) within the rose family (Rosaceae). Like the Baden whitebeam ( Sorbus badensis Düll ) or Meyer's whitebeam ( Sorbus meyeri S. Hammel & Haynold ), it is a hybridization of the Greek whitebeam i. w. S. ( Sorbus graeca (Spach) Lodd. Ex Schauer s. L.) With the service tree ( Sorbus torminalis (L.) Crantz ) originated. As an agamosperm species, it reproduces asexually.
description
Vegetative characteristics
The Seybold whitebeam is a medium-sized tree that grows up to 10 meters, rarely up to 20 meters. Older trees in the sun almost only form short shoots. The green leaf blades of the short shoots are 7 to 9.5 inches long and 4.5 to 7 inches wide. The leaves of the long shoot reach a length of 8.5 to 10.5 centimeters and a width of 5.5 to 8 centimeters. The leaf blade is broadly elliptical, often folded towards the median nerve. The first five lobes of the leaf margin are clearly incised, rounded and finely serrated on the basal side. The underside of the leaf blade is hairy gray-tomentose. The leaf blade has nine to eleven pairs of leaf veins.
Generative characteristics
The Seybold whitebeam is triploid. The orange-brown to reddish false fruits are 11 to 13 × 10 to 13 millimeters in size. The fruit ripens in mid to late September.
Occurrence
Sorbus seyboldiana is a local endemic to Baden-Württemberg and Bavaria in the Tauberland . The main occurrence is around 500 specimens on the Leitenberg east of Werbach- Werbachhausen . Sorbus seyboldiana has so far been detected at altitudes of 200 to 330 meters. The Seybold whitebeam grows in old sheep pastures and on the edges of forests.
Endangerment and nature conservation
Only a few occurrences of the Seybold whitebeam are in nature reserves. The stately occurrences are seriously endangered by changes in use. The Red List of Fern and Flowering Plants in Germany describes Sorbus seyboldiana as extremely rare. Germany is particularly responsible for their preservation.
Botanical history and taxonomy
As part of the forest biotope mapping in Baden-Württemberg, bastard whitebeams ( Sorbus latifolia agg.) Were mapped on Leitenberg in 2002 . These trees were first described in 2015 by Steffen Hammel and Bernd Haynold as Sorbus seyboldiana . The specific epithet seyboldiana honors the Ludwigsburg botany professor Siegmund Gerhard Seybold . The type proof is in the Natural History Museum Stuttgart (STU).
Sennikov and Kurtto lead the species since 2017 under the name Karpatiosorbus seyboldiana ; Christenhusz, Fay and Byng place them under Pyrus seyboldiana in 2018 .
source
- Steffen Hammel, Bernd Haynold: Sorbus seyboldiana - a new whitebeam from Baden-Württemberg and Bavaria. In: Annual Books of the Society for Natural History in Württemberg , Volume 171, 2015, pp. 51–68.
- Alexander Sennikov, Arto 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
- Maarten MJ Christenhusz, Michael F. Fay, James W. Byng: The Global Flora Special Edition: GLOVAP Nomenclature Part 1, 2018.
- Detlef Metzing, Eckhard Garve, Günter Matze-Hajek: Red list and total species list of fern and flowering plants ( Trachaeophyta ) in Germany ". In: Red list of endangered animals, plants and fungi in Germany, Volume 7: Plants, nature conservation and biological diversity 70 (7 ), Pages 13-358.
