Aria seyboldiana

Aria seyboldiana
Flowering Aria seyboldiana growing in the Tauberland, Germany
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Embryophytes
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rosaceae
Genus: Aria
Species:
A. seyboldiana
Binomial name
Aria seyboldiana
(S.Hammel & Haynold) Mosyakin, Fedor. & McNeill[2]
     It is endemic to Baden-Württemberg and Bavaria, Germany[1]
Synonyms[2]
  • Karpatiosorbus seyboldiana (S.Hammel & Haynold) Sennikov & Kurtto
  • Pyrus seyboldiana (S.Hammel & Haynold) M.F.Fay & Christenh.
  • Sorbus seyboldiana S.Hammel & Haynold

Aria seyboldiana, or Seybold's whitebeam,[3] is an apomictic species[4] of tree in the family Rosaceae endemic to Baden-Württemberg[2] and Bavaria, Germany.[1] It is extremely rare[4][5] and threatened with extinction.[1] It is believed to have arisen by hybridisation of Aria graeca s.l. and Aria torminalis.[6]

Description

Aria seyboldiana tree growing in Bavaria, Germany
Fruiting Aria seyboldiana

Vegetative characteristics

Aria seyboldiana is an up to 10(–20) m tall tree[1] with a trunk circumference of up to 64 cm at the height of 150 cm.[6] The initially smooth and later fissured bark is greyish brown.[6]

Generative characteristics

The (2.8–)4.5­–6(–7) cm wide inflorescence bears 20­–25(–27) pedicellate, white, 1.6­–1.8 cm wide flowers. The androecium is composed of 20 white, 4–6 mm long stamens with cream or faintly green anthers. The ovary with white pubescence bears 2 glabrous, faintly green, basally fused, 3.5 mm long styles with glabrous stigmas. The elliptic to globose fruit bears 1(–2) brown, 5 mm long, 3 mm wide, and 2 mm high seeds.[6]

Cytology

It is triploid[7][8] with a chromosome count of 2n = 51.[9][10]

Taxonomy

It was first described as Sorbus seyboldiana S.Hammel & Haynold by Steffen Hammel and Bernd Haynold in 2015.[6][11] It was moved to the genus Aria (Pers.) J.Jacq. ex Host as Aria seyboldiana (S.Hammel & Haynold) Mosyakin, Fedor. & McNeill by Sergei Leonidovich Mosyakin, Mykola Mykhaylovych Fedoronchuk, and John McNeill in 2025.[12] The type specimen, which is held in the State Museum of Natural History Stuttgart, was collected on the 19th of June 2014 by Hammel and Haynold southeast of Werbachhausen, Baden-Württemberg, Germany on a former sheep pasture at an altitude of 235 m above lea level.[11] It was first documented by Andreas Kneucker in the forest near Werbachhausen in Baden-Württemberg, Germany on the 19th of June 1945.[13]

Etymology

The specific epithet seyboldiana honours Siegmund Gerhard Seybold.[11]

Distribution and habitat

It occurs in grassland, forests, and transitional zones between these habitats at 200–330 m above sea level in Baden-Württemberg and Bavaria, Germany.[1] The largest part of its population occurs in the Welzbachtal, a side valley of the Taubertal, near Werbachhausen, Baden-Württemberg, Germany.[13]

Conservation

It is a critically endangered species with a restricted distribution and a population of only 17 mature individuals and one juvenile tree.[1] It is of very high importance in terms of nature conservation[5] and is included in the red list of Bavaria[4] and Baden-Württemberg.[5] It occurs within three nature reserves, but two of the reserves only have one tree each, while the third has the remaining 16 individuals.[1] It is cultivated in the Hohenheim Gardens.[14]

Uses

Aria seyboldiana may have been used as firewood.[6]

References

  1. 1 2 3 4 5 6 7 8 Beech, E., Meyer, N. & Rivers, M.C. 2017. Sorbus seyboldiana. The IUCN Red List of Threatened Species 2017: e.T91071133A91071258. https://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T91071133A91071258.en. Accessed on 12 August 2026.
  2. 1 2 3 Aria seyboldiana (S.Hammel & Haynold) Mosyakin, Fedor. & McNeill. (n.d.). Plants of the World Online. Retrieved August 12, 2026, from https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77371577-1
  3. ↑ Blaich, G. (n.d.). Sorbus seyboldiana  S.HAMMEL & HAYNOLD. Retrieved August 13, 2026, from https://guenther-blaich.de/pflseite.php?par=Sorbus+seyboldiana&abs=pflfmros&lan=x&grp=a
  4. 1 2 3 Sorbus seyboldiana S. Hammel & Haynold. (n.d.). Botanischer Informationsknoten Bayern (BIB). Retrieved August 12, 2026, from https://daten.bayernflora.de/de/info_pflanzen.php?taxnr=36265
  5. 1 2 3 Breunig, T. & S. Demuth (2023): Rote Liste der Farn- und Blütenpflanzen Baden-Württembergs. – 4. Fassung, Stand 15.06.2021. – LUBW Landesanstalt für Umwelt Baden-Württemberg (Hrsg.). – Naturschutz-Praxis Artenschutz 2.
  6. 1 2 3 4 5 6 Hammel, S., & Haynold, B. (2015). Sorbus seyboldiana – eine neue Mehlbeere aus Baden-Württemberg und Bayern. Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 171, 051-068.
  7. ↑ Hammel, S., Haynold, B., Gregor, T., & Paule, J. (2015). Ploidie-Bestimmung baden-württembergischer Bastard-Mehlbeeren. Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 171, 069-075.
  8. ↑ Sennikov, A. N., & Kurtto, A. (2017). A phylogenetic checklist of Sorbus s.l. (Rosaceae) in Europe. Memoranda Societatis pro Fauna et Flora Fennica, 93, 1-78.
  9. ↑ Meyer, N., & Hammel, S. (2023). Besondere Arten der Gattung Sorbus: Bemerkungen zu den Eigenheiten der Gattung Sorbus in Baden-Württemberg. Karlsruhe.
  10. ↑ Senckenberg Gesellschaft für Naturforschung. (n.d.). Sorbus seyboldiana. Chromosomenzahlen Zur Flora Von Deutschland. Retrieved August 13, 2026, from https://chromosomes.senckenberg.de/search/items?full_text=Sorbus+seyboldiana&taxa-level-0=0&taxa-level-1=0&taxa-level-2=0&taxa-level-3=0&taxon_id=&fields%5B62%5D=0&fields%5B69%5D%5Bmin%5D=47.21353887141794&fields%5B69%5D%5Bmax%5D=54.79556787598423&fields%5B70%5D%5Bmin%5D=7.156210937500001&fields%5B70%5D%5Bmax%5D=13.923789062500001&fields%5B85%5D%5Bmin%5D=&fields%5B85%5D%5Bmax%5D=#searchResults
  11. 1 2 3 Sorbus seyboldiana S.Hammel & Haynold. (n.d.). International Plant Names Index. Retrieved August 12, 2026, from https://www.ipni.org/n/77157414-1
  12. ↑ Mosyakin, S. L., Fedoronchuk, M. M., & McNEILL, J. (2025). Simplifying the nomenclature of Sorbus sensu lato: new nomenclatural solutions in Aria and Hedlundia (Rosaceae). Ukrainian Botanical Journal, 82(3), 206-224.
  13. 1 2 Hammel, S., & Simmel, J. (2022). Neues zur Mehlbeeren-Flora von Baden-Württemberg und Bayern aus dem Herbar des Staatlichen Museums für Naturkunde Karlsruhe. Carolinea, 80, 17-24.
  14. ↑ Sorbus seyboldiana S. Hammel & Haynold 2015. (n.d.). Hohenheimer Gärten, Universität Hohenheim. Retrieved August 12, 2026, from https://virtuelle-gaerten.uni-hohenheim.de/4DAction/W_Init/HG_Unit_de?UnitPK=HOH-DS-1-16922
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